oscarcot
Junior Member level 1
Hi guys,
please, somebody tell me, why is the telescopic amplifier supposed to have a superior noise performance compared to other amplifiers? Regarding the folded cascode, it's ok, we have more transistors producing noise.
But, what about the ordinary 2-stage Miller amplifier?, or a simple current-mirror loaded differential amplifier? I checked the thermal noise equations in the Noise chapter of the Razavi book, and they all look practically the same: "16kT/3( 1/gm1^2+ gm2/gm1^2) + ..."
Am I supposed to expect the same noise performance of a telescopic and a two-stage Miller amplifier with same transistor sizes?
Cheers and thanks,
Oscar
please, somebody tell me, why is the telescopic amplifier supposed to have a superior noise performance compared to other amplifiers? Regarding the folded cascode, it's ok, we have more transistors producing noise.
But, what about the ordinary 2-stage Miller amplifier?, or a simple current-mirror loaded differential amplifier? I checked the thermal noise equations in the Noise chapter of the Razavi book, and they all look practically the same: "16kT/3( 1/gm1^2+ gm2/gm1^2) + ..."
Am I supposed to expect the same noise performance of a telescopic and a two-stage Miller amplifier with same transistor sizes?
Cheers and thanks,
Oscar