Pro Audio Design Forum

... on the servo (thanks JR) to relax servo op amp bandwidth requirements and allow its selection to focus on DC characteristics. The differential Deboo met both requirements in that it has a passive input pole and uses a single film cap. The Deboo has an advantage over a conventional "two ...

... The circuit above is virtually identical to the original in terms of noise performance. The servo has been updated to a Differential Deboo and a TL431 shunt regulator added to improve PSRR. The design is completely DC-coupled. A high pass filter response is derived by a servo. C7, ...

I just revisited the ZTX851 MC preamp and decided to test a servo proposed by olafmat. http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=6&t=697&p=11280#p11280 This is olafmat's servo applied to a "classic" input stage. http://www.analoglabor.de/DIY/instamp_new_servo.jpg...

... well with the ZTX851 MC phono preamp test circuit. http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=6&t=783 I used a Differential Deboo servo sampled at the INA output. Since my bias resistors were originally referenced to the negative rail rather than ground I injected, through ...

... use a non-inverting servo which would allow you to use a simple RC passive integrator at the input to the op amps. That might be simpler than the Deboo.

... for the pointer on the infrasonic resonance. Simulating increasing the input RB to 20k did this! Servo Sim.pdf I'll do some more research on the Deboo and get my head around it. Anyone that has more experience in this area and wants to suggest a good config and values for this servo circuit please ...

... The OPA2277 is a good DC servo op amp. There's no passive input pole in the servo which is something JR has educated me about. Take a look at the Deboo integrator http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=12&t=866&start=2 and then follow the links to DC-coupled preamp. ...

"Consider The Deboo Integrator For Unipolar Noninverting Designs," Elliot Simons, Maxim Integrated Products, Electronic Design, March 18, 2002. The non-inverting Deboo integrator has a passive input pole which is important ...

... monotonic in response to step changes due to capacitor and resistor tolerance. That can contribute to stability issues as well. The differential Deboo uses one cap relying solely on resistor matching. Gary, out of curiosity, simulated my differential DeBoo for me to check its stability, but not ...

... caps. I tested this two different ways one intentionally and one unintentionally. The first time I went looking for it. That was not with the Deboo. At least one other time I recall with the Deboo looking at the effects of input capacitors on 1/f noise vs. no input capacitors and the resulting ...