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DC Servos - sound-au.com
https://sound-au.com/articles/dc-servo.htm
A DC servo does pretty much eliminate any DC offset, but for most power amplifiers it's already low enough so as not to cause any problems. A DC servo is a very good idea if an amplifier is driving a transformer, but that's purely to ensure that there is no DC in the transformer winding.
Chapter 23 The Design of DC Servos - Audio Power …
https://www.oreilly.com/library/view/audio-power-amplifier/9780240526133/032_9780240526140_chapter23.html
Chapter 23 The Design of DC Servos DC Offset Trimming DC Offset Control by Servo-loop Advantages of DC Servos Basic Servo Configurations Noise, Component Values, and the Roll-off Non-inverting Integrators … - Selection from Audio Power Amplifier Design, 6th Edition [Book]
Audio Engineering Society Convention Paper
http://www.thatcorp.com/datashts/AES9198_DC_Servos_and_Digitally-Controlled_Microphone_Preamplifiers.pdf
an on-board DC servo amplifier to maintain the offset gain (defined as the gain between the input offset voltage of an amplifier to the amplifier output, also often referred to as the noise gain) of the preamplifier at a constant value regardless of the ac gain. This approach is an alternative to simply ac-coupling the
Website of Wayne Stegall - Simple DC Servos
http://waynestegall.com/audio/simpledcservos.htm
Servo Design Procedure Choose break frequency of 159.155mHz for even 1sec time constant. Choose LF411 operational amplifier. Want first stage of servo at 0V DC bias to drive C 2S of second stage to -7.5V V GS = V T + sqrt(I D /k n) = -402.516mV + sqrt(2.01944mA/37.8643mA/V 2) = -171.575mV I RS = 2 x I D = 4.03889mA Calculate R terminated to -7.5V:
What is a servo? - Universal Audio | Audio Interfaces
https://www.uaudio.com/webzine/2006/december/text/content2.html
However, the DC offset at the output of the circuit will be equal to the input offset voltage of the servo. Typically, this provides a marked decrease in offset voltage. The servo op-amp does not need to have exceptional bandwidth, slew-rate, input impedance or output impedance, so an op-amp with a very small offset voltage can usually be chosen.
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