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High-gain voltage amplifier with a differential input
An operational amplifier (often op amp, op-amp, or opamp) is a DC-coupled electronic amplifier with a differential input, a (usually) single-ended output
Operational_amplifier
Type of electronic amplifier
The current-feedback operational amplifier (CFOA or CFA) is a type of electronic amplifier whose inverting input is sensitive to current, rather than to
Current-feedback operational amplifier
Current-feedback_operational_amplifier
Operational amplifiers have several applications, optimised for use with negative feedback. When positive feedback is required, a comparator is usually
Operational amplifier applications
Operational_amplifier_applications
Electrical circuit
The operational transconductance amplifier (OTA) is an amplifier that outputs a current proportional to its input voltage. Thus, it is a voltage controlled
Operational transconductance amplifier
Operational_transconductance_amplifier
Type of electronic amplifier
A negative-feedback amplifier (or feedback amplifier) is an electronic amplifier that subtracts a fraction of its output from its input, so that negative
Negative-feedback_amplifier
Amplifier that converts current to voltage
transimpedance amplifier (TIA) is a current to voltage converter, almost exclusively implemented with one or more operational amplifiers (opamps). The
Transimpedance_amplifier
Electrical circuit component which amplifies the difference of two analog signals
{\displaystyle A} is the gain of the amplifier. Single amplifiers are usually implemented by either adding the appropriate feedback resistors to a standard op-amp
Differential_amplifier
Operational amplifier
The μA741 is an early operational amplifier (op amp) integrated circuit (IC), originally designed at Fairchild Semiconductor by Dave Fullagar and released
ΜA741
Control concept
any error is reduced by negative feedback to the input. In analog computing, feedback around operational amplifiers is used to generate mathematical functions
Negative_feedback
Electronic device/component that increases the strength of a signal
advantage of negative feedback is that it extends the bandwidth of the amplifier. The concept of feedback is used in operational amplifiers to precisely define
Amplifier
Precision differential amplifier with input buffering
Instrumentation amplifiers can also be designed using "indirect current-feedback architecture", which extend the operating range of these amplifiers to the negative
Instrumentation_amplifier
Electronic circuit
stages of high-speed current-feedback operational amplifiers. The circuit is also the essential building block of bipolar current conveyors, and has seen
Diamond_buffer
DC-coupled high-gain electronic voltage amplifier with differential inputs and outputs
computer Current-feedback operational amplifier Instrumentation amplifier Operational amplifier applications Operational transconductance amplifier Nancy
Fully_differential_amplifier
Current controlled voltage source electronic circuit
current difference input and differential current output Current-feedback operational amplifier, single-ended current input and voltage output. Terrell, p
Norton_amplifier
Electronic current integrator
input current, or the total charge injected. The amplifier offsets the input current using a feedback reference capacitor, and produces an output voltage
Charge_amplifier
Electrical circuit
electric current as input instead of voltage. Log amplifier circuits designed with operational amplifiers (opamps) use the exponential current–voltage
Log_amplifier
Electronic amplifier that varies its gain depending on a control input
configuration with a light-dependent resistor (LDR) in the feedback loop. The gain of the amplifier then depends on the light falling on the LDR, which can
Variable-gain_amplifier
Process where information about current status is used to influence future status
relating to operational amplifiers. For an analysis of desensitization in the system pictured, see S.K Bhattacharya (2011). "§5.3.1 Effect of feedback on parameter
Feedback
Topics referred to by the same term
broadcasting Crossed-field amplifier, a specialized vacuum tube used as a microwave amplifier Current-feedback operational amplifier Component failure analysis
CFA
Circuit component performing mathematical integration
The operational amplifier integrator is an electronic integration circuit. Based on the operational amplifier (op-amp), it performs the mathematical operation
Op_amp_integrator
Type of electronic circuit
linear oscillator is an electronic amplifier such as a transistor or operational amplifier connected in a feedback loop with its output fed back into
Electronic_oscillator
Amplifier design technique
frequency compensation is a technique used in amplifiers, and especially in amplifiers employing negative feedback. It usually has two primary goals: To avoid
Frequency_compensation
Characteristic quality of sounds from vacuum tube amplifiers
many solid-state amplifiers, designed specifically to amplify electric instruments such as guitars or bass guitars, employ current feedback circuitry. This
Tube_sound
Type of electronic amplifier
A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Low to medium
Valve_amplifier
Process of creating equivalent circuits
help in designing and understanding various commonplace circuits (feedback amplifiers, resistive and time-dependent converters, negative impedance converters
Miller_theorem
Figure of merit for amplifiers
bandwidth of the amplifier (the bandwidth within which the amplifier gain is at least 1). For an amplifier in which negative feedback reduces the gain
Gain–bandwidth_product
Electronic component delivering stable electric current regardless of voltage
by applying parallel negative feedback might be considered to improve the source. Operational amplifiers with feedback effectively work to minimise the
Current_source
CMOS amplifiers (complementary metal–oxide–semiconductor amplifiers) are ubiquitous analog circuits used in computers, audio power amplifiers, smartphones
CMOS_amplifier
Operational amplifier for audio applications
operational amplifier (op amp) for audio applications introduced by Signetics in 1979. The 5532 and the contemporary TL072 were the first operational
NE5532
Flow graph invented by Claude Shannon
negative terminal of the power amplifier KC. This feedback causes the voltage amplifier to act like a voltage controlled current source. Since the motor torque
Signal-flow_graph
Undesirable cyclic variations in voltage or current within an electronic device
unintentional feedback combined with sufficient gain and phase shift in an amplifying device. It occurs most commonly in RF and audio amplifiers, but can arise
Parasitic_oscillation
Change of voltage or current per unit of time
is the same, regardless of whether feedback is considered. There are slight differences between different amplifier designs in how the slewing phenomenon
Slew_rate
Electronic comparator circuit with hysteresis
hysteresis implemented by applying positive feedback to the noninverting input of a comparator or differential amplifier. It is an active circuit which converts
Schmitt_trigger
Comparators are closely related to operational amplifiers, but a comparator is designed to operate with positive feedback and with its output saturated at
Comparator_applications
Device for electrically amplifying the power of an electrical radio frequency signal
A valve RF amplifier (UK and Aus.) or tube amplifier (U.S.) is a device for electrically amplifying the power of an electrical radio frequency signal
Valve_RF_amplifier
Ability of a circuit to increase the power or amplitude of a signal
gain), current (current gain) or electric power (power gain). In the field of audio and general purpose amplifiers, especially operational amplifiers, the
Gain_(electronics)
Device that compares two voltages or currents
the difference in characteristics of an operational amplifier and comparator, using an operational amplifier as a comparator presents several disadvantages
Comparator
Voltage reference used in integrated circuits
reference, the circuit uses negative feedback (by means of an operational amplifier) to force a constant current through two bipolar transistors with
Brokaw_bandgap_reference
Input needed to zero an amplifier output
between the inputs of an amplifier, especially an operational amplifier (op-amp), to make the output zero (for voltage amplifiers, 0 volts with respect to
Input_offset_voltage
Electronic circuit
transistors, and even vacuum tubes. An example application is the 741 operational amplifier, and Widlar used the circuit as a part in many designs. This circuit
Widlar_current_source
Control loop feedback mechanism
use of feedback controllers did not become feasible until the development of wideband high-gain amplifiers to use the concept of negative feedback. This
PID_controller
example, the inputs of an ideal operational amplifier (with negative feedback) behave like a nullator, as they draw no current and have no voltage across them
Nullator
Topics referred to by the same term
American software developer David Nelson, inventor of the current-feedback operational amplifier David Nelson (engineer), Australian Formula One engineer
David_Nelson
Circuit designed to copy a current through one active device
inverting current amplifier that reverses the current direction as well, or it could consist of a current-controlled current source (CCCS). The current mirror
Current_mirror
Method of measuring biological cell currents
negative feedback. The membrane potential amplifier measures membrane voltage and sends output to the feedback amplifier; this subtracts the membrane voltage
Voltage_clamp
Fixed potential node in an electric circuit
gain. Since an operational amplifier has very high open-loop gain, the potential difference between its inputs tends to zero when a feedback network is implemented
Virtual_ground
Analog circuit which filters an electronic signal using an amplifier
no DC path is provided for bias current to the amplifier elements. Power handling capability is limited by the amplifier stages. Active filter circuit configurations
Active_filter
conditions. For example, an ideal operational amplifier can be modeled using a nullor, and the textbook analysis of a feedback circuit using an ideal op-amp
Nullor
Startup technique in electronics
more generally for dynamically altering the operating point of an operational amplifier (by shifting both its positive and negative supply rail) in order
Bootstrapping_(electronics)
LC oscillator design
transistor, field-effect transistor, operational amplifier, or vacuum tube) with its output connected to its input in a feedback loop containing a parallel LC
Colpitts_oscillator
Type of circuit
differentiating amplifier or inverting differentiator) consists of an ideal operational amplifier with a resistor R providing negative feedback and a capacitor
Differentiator
System designed to maintain a constant voltage
differential amplifier, possibly implemented as an operational amplifier: In this case, the operational amplifier drives the transistor with more current if the
Voltage_regulator
British audio equipment manufacturer
power supply units (PSU) to deliver current for musical transients. The company's two-channel NAP 250 amplifier made its début in 1975. The company,
Naim_Audio_amplification
Electric circuit that generates sine waves
can also be viewed as a positive gain amplifier combined with a bandpass filter that provides positive feedback. Automatic gain control, intentional non-linearity
Wien_bridge_oscillator
Transistor amplifier
compressors, microphone amplifiers, and dbx noise reduction systems. In the 21st century, the Blackmer cell, along with Douglas Frey's Operational Voltage Controlled
Blackmer_gain_cell
Low frequency audio feedback
both old and new designs, even mostly directly-coupled operational amplifier circuits, feedback through the power supply rails can generate ultrasonic
Motorboating_(electronics)
Captures vibrations produced by musical instruments
converts these to an electrical signal that is amplified using an instrument amplifier to produce musical sounds through a loudspeaker in a speaker enclosure
Pickup_(music_technology)
Electronic filter topology
reasonable approximation to an amplifier with unity voltage gain. Modern analog filter implementations may use operational amplifiers (also called op amps). Because
Sallen–Key_topology
Electronic circuit
of the value (via a multiplier/squarer circuit in the feedback loop of an operational amplifier).[citation needed] A full-wave precision rectifier circuit
True_RMS_converter
Protective electronic circuit
clippers can be made by placing the clipping device in the feedback circuit of an operational amplifier in a manner similar to precision rectifiers. Clippers
Clipper_(electronics)
Topics referred to by the same term
protein Compact fluorescent bulb Current feedback, a type of electronic feedback used in some operational amplifiers Circulating fluidized bed, a type
CFB
American semiconductor manufacturer
Amplifiers includes precision and operational amplifiers, instrumentation, current sense, differential amplifiers, audio amplifiers, video amplifiers/buffers/filters
Analog_Devices
Component that outputs the integral of its input over time
analyzer Fractional-order integrator Integrating ADC Low-pass filter Operational amplifier Signal processing "Integrator". Britannica. Retrieved 2024-12-02
Integrator
Form of waveform distortion
occurs when an amplifier is overdriven and attempts to deliver an output voltage or current beyond its maximum capability. Driving an amplifier into clipping
Clipping_(audio)
Version of bridge circuit
Ordinary operational amplifiers can be adopted with limitations in accuracy and bandwidth. The Fontana bridge is also called Compensated Current Injection
Fontana_bridge
Electronic circuit with sine-wave output
positive feedback is voltage series feedback. The implementation of the phase-shift oscillator shown in the diagram uses an operational amplifier (op-amp)
Phase-shift_oscillator
Type of electrical circuit
differential to single-ended signal conversion within an operational amplifier. At low bias currents, the impedances in the circuit are high enough that the
Wilson_current_mirror
Active circuit which injects energy into circuits
\text{S}}\left(1+{\frac {R_{2}}{R_{1}}}\right).} The current going from the operational amplifier output through resistor R 3 {\displaystyle R_{3}} toward
Negative_impedance_converter
positive feedback from the output of an electronic device to its input. The latter appears often in feedback amplifiers (such as operational amplifiers) that
Electronic_oscillation
Electrical circuit
The precision rectifier, sometimes called a super diode, is an operational amplifier (opamp) circuit configuration that behaves like an ideal diode and
Precision_rectifier
Type of active circuit electronic filter
Huelsman, Lawrence P.; Korn, Granino A. (1992). Introduction to Operational Amplifier Theory and Applications (2nd ed.). McGraw-Hill. pp. 295–303. ISBN 0-07-067770-0
Leapfrog_filter
Methods to improve tape performance by adjusting input bias
decrease in bias current using either feedforward or preferably a negative feedback control system. Compared with the use of fixed bias current, adaptive biasing
Adaptive_biasing
Branch of engineering and mathematics
invented the concept of negative-feedback amplifiers in 1927. He managed to develop stable negative-feedback amplifiers in the 1930s. Harry Nyquist developed
Control_theory
Integrated circuit logic family
bipolar junction transistor (BJT) differential amplifier with single-ended input and limited emitter current to avoid the saturated (fully on) region of
Emitter-coupled_logic
Electronic circuit that behaves chaotically
negative impedance converter made from three linear resistors and an operational amplifier, which implements the locally active resistance (negative resistance)
Chua's_circuit
Electronic system controlling a three electrode cell
adjusting the current at an auxiliary electrode. The heart of the different potentiostatic electronic circuits is an operational amplifier (op amp). It
Potentiostat
Overview of and topical guide to electrical engineering
Inductor Resistor Hall-effect sensor Active elements: Microcontroller Operational amplifier Semiconductors: Diode Zener diode Light-emitting diode PIN diode
Outline of electrical engineering
Outline_of_electrical_engineering
Computation machine that uses continuously varying data technology
more operational amplifiers ("op amps"), named because they perform mathematical operations. Op amps are a particular type of feedback amplifier with
Analog_computer
Electrical isolation mechanism
output of the operational amplifier, and the photoresistor was part of a voltage divider in the feedback circuit of a non-inverting amplifier. Depending
Resistive_opto-isolator
Device which uses electromagnetic induction to sense objects
tank circuit. In conjunction with a voltage or current gain device like a transistor or operational amplifier, this forms a tuned frequency oscillator. When
Inductive_sensor
Electrical engineer, academic, and author
instrumentation amplifier (IA) designed for medical applications, utilizing current feedback and single-stage operational transconductance amplifiers in the low-frequency
Willy_Sansen
Crossed-field amplifier Crosstalk Cruise control Crystal oscillator Ćuk converter Current (electricity) Current density Current division Current source inverter
Index of electrical engineering articles
Index_of_electrical_engineering_articles
Electronic component
input-side operational amplifier to compensate for diode non-linearity. One of two identical diodes is wired into the feedback loop of the amplifier, which
Opto-isolator
Use of various control systems for operating equipment
plant to manually make certain changes. The development of the electronic amplifier during the 1920s, which was important for long-distance telephony, required
Automation
Electric circuit composed of resistors and capacitors
appropriate on the input and feedback loop of operational amplifiers (see operational amplifier integrator and operational amplifier differentiator). The parallel
RC_circuit
Oscillator that produces a nonsinusoidal repetitive waveform
electronic oscillator, the harmonic or linear oscillator, which uses an amplifier with feedback to excite resonant oscillations in a resonator, producing a sine
Relaxation_oscillator
important to run transmitter power amplifier as close to its saturation power as possible in order to minimize operational expenditure and capital expenditure
Multidimensional digital pre-distortion
Multidimensional_digital_pre-distortion
Semiconductor diode
Schottky diode and an operational amplifier, provides an almost perfect diode characteristic due to the effect of negative feedback, although its use is
Schottky_diode
Alternating current – AM radio – Amateur radio – Ambient noise level – American Radio Relay League (ARRL) – Ammeter – Ampere – Amplifier – Amplitude distortion
Index_of_electronics_articles
Device that converts a digital signal into an analog signal
summing point, typically an operational amplifier. Each input in the summing has powers-of-two weighting with the most current or voltage at the most-significant
Digital-to-analog_converter
Type of resistor, usually with three terminals
is large compared to the other resistances (like the input to an operational amplifier), the output voltage can be approximated by the simpler equation
Potentiometer
American scientist and engineer (1905–1982)
World War II." Bode, in addition, applied his extensive skills with feedback amplifiers to design the target data smoothing and position predictor networks
Hendrik_Wade_Bode
compensation used in an electronic amplifier. When a capacitor is introduced between the input and output sides of the amplifier with the intention of moving
Pole_splitting
Linear integrated circuit precision shunt regulator
the output current, ICA, flows from the cathode to the anode. On a functional level the TL431 contains an open-loop operational amplifier that compares
TL431
American electronics engineer (1937–1991)
operational amplifier ICs (μA702, μA709), some of the earliest integrated voltage regulator ICs (LM100 and LM105), the first operational amplifiers employing
Bob_Widlar
the input is via Vin(1). In this mode, the amplifier behaves somewhat like a 'current feedback amplifier'. The circuit maintains its bandwidth as the
EMI_2001
Type of field-effect transistor
devices, for example the cascode and cascade amplifiers, or by feedback circuitry using operational amplifiers, for example a circuit like that in the adjacent
MOSFET
an electrical network. operational amplifier A type of amplifier with differential inputs, widely used in circuits where feedback determines the circuit
Glossary of electrical and electronics engineering
Glossary_of_electrical_and_electronics_engineering
Electronic circuit used to implement two-state devices
junction or field-effect transistors, vacuum tubes, operational amplifiers, or other types of amplifier. Figure 1, below right, shows bipolar junction transistors
Multivibrator
Electrophysiological device
is an electrophysiological device, a variation of the instrumentation amplifier, used to gather and increase the signal integrity of physiologic electrical
Bioamplifier
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CURRENT FEEDBACK-OPERATIONAL-AMPLIFIER
CURRENT FEEDBACK-OPERATIONAL-AMPLIFIER
CURRENT FEEDBACK-OPERATIONAL-AMPLIFIER
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CURRENT FEEDBACK-OPERATIONAL-AMPLIFIER
CURRENT FEEDBACK-OPERATIONAL-AMPLIFIER
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