Samuel Groner
Well-known member
Hi
Working on this gain stage (for a transformerless mic pre): [removed]
Almost everything simulates well except negative PSRR - about +25 dB instead of the -70 dB I'd like... Seems to enter mostly at Q7 emitter, and a bit at Q6 emitter.
Any quick fix for this? RC filtering is unlucky as this would need impossible sized caps.
Oh, and if your solution would include a (push-pull?) VAS which removes the slew-rate constraint set by the current topology, that would be great!
Thanks for your help!
Samuel
Working on this gain stage (for a transformerless mic pre): [removed]
Almost everything simulates well except negative PSRR - about +25 dB instead of the -70 dB I'd like... Seems to enter mostly at Q7 emitter, and a bit at Q6 emitter.
Any quick fix for this? RC filtering is unlucky as this would need impossible sized caps.
Oh, and if your solution would include a (push-pull?) VAS which removes the slew-rate constraint set by the current topology, that would be great!
Thanks for your help!
Samuel