In communication, automatic control and telemetry systems, low distortion automatic gain control circuits are required. As shown in the figure, a low distortion AGC amplifier is shown. A1 is an amplifier, and A2 is a voltage follower, which acts as an isolation stage and introduces feedback to amplifier A1. The integrated operational amplifier in (a) can be appropriately selected according to actual needs. If a single power supply is desired, a low power quad operational amplifier circuit AD824A or AD824B can be selected; if a dual power supply is desired, a quad operational amplifier integrated chip such as μPC4074 can be used.
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Recommended ReadingLatest update time:2024-11-16 16:46
Switched Gain Op Amp as Phase Detector or Mixer
Some op amps, such as the AD8041 from Analog Devices and the EL5100 from Intersil, offer a disable pin that allows one to connect the outputs of several op amps in parallel for video multiplexing. In addition to such multiplexing, one can use this disable feature to configure the op amp as a phase detector or mixer.
[Power Management]
Characteristics of Operational Amplifiers
Assume that a voltage ud =u+-u- is applied between a and b, then the transfer characteristic curve between output uo and input ud is as follows:
Divided into three regions: ① Linear working area: -ε |ud| ε, then uo=Aud ② Forward saturation area: ud ε, then uo= Usat ③ Reverse saturation area: ud - ε, then uo= -Us
[Analog Electronics]
Using the Homogeneity Theorem to Analyze the Ideal Operational Amplifier
l Homogeneity Theorem Theorem In a linear circuit, when all independent sources increase or decrease by K times (K is a real constant), the current or voltage of each branch will also increase or decrease by K times. Theorem application method: First assume that the output uo of the operational amplifier is 1,
[Power Management]
A sample-and-hold amplifier with a gain of 2 and no external resistors
When you need to sample a signal and amplify it at the same time, you can cascade a general-purpose sample-and-hold amplifier with a gain of 1 and an amplifier with a voltage gain of 1. With some exceptions, such an amplifier has two external resistors (Reference 1). These resistors dissipate power even when the sam
[Power Management]
Spread-spectrum modulation minimizes EMI in Class D amplifiers
introduction
Class D amplifiers are more attractive to designers of portable audio applications because they are more efficient than Class AB amplifiers. However, some designers do not use Class D amplifiers in portable applications because traditional PWM-based Class D amplifiers require large and expensive filteri
[Power Management]
Voltage stabilization circuit diagram composed of operational amplifier
Voltage stabilization circuit diagram composed of operational amplifier
[Analog Electronics]
Base station requirements for highly integrated low noise amplifiers
As the frequency bandwidth of wireless broadband systems becomes wider and wider, the performance requirements of base stations are also getting higher and higher. As one of the key components in base station tower amplifiers, low noise amplifiers not only affect the coverage of base stations, but also determine the
[Power Management]
Design of single-ended differential audio amplifier with equal signal output
The number of portable devices has exploded, and with the addition of many new features, there is an increasing number of portable devices with external speaker audio playback capabilities, such as MP3 players, mobile phones with MP3 functions or speakers, and portable CD players. The output of these systems varies de
[Analog Electronics]
- Popular Resources
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Operational Amplifier Practical Reference Handbook (Edited by Liu Changsheng, Zhao Mingying, Liu Xu, etc.) - A Complete Illustrated Guide to Operational Amplifier Applications (Written by Wang Zhenhong)
- Design of isolated error amplifier chip for switching power supply_Zhang Rui
- DAM medium wave transmitter high frequency power amplifier module test platform_Tian Tian
Operational Amplifier Practical Reference Handbook (Edited by Liu Changsheng, Zhao Mingying, Liu Xu, etc.)
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