prcken
Junior Member
Offline
Posts: 18
PRC
|
Hi All, I did 1. opamp open loop simulation, folded cascode with and w/o gain boost 2. put the opamp into multiply-by-two configuration, do pss+pstb analysis, check the gain and unity freq. 3.in the open loop bode plot, DC gain of opamp with and w/o gain boosting is 66.7dB and 44.25dB, respectively. GBW is more than 500MHz and 700MHz, respectively. 4. in the SC configuration, the loop gain drops to 42.45dB and 33.45dB for with and w/o gain boosting, respectively, at 50MHz sampling rate, the GBW drops to ~56MHz and ~45MHz, respectively. seems has two poles there so that the slope falls faster.
I don't know how to add multiple pictures, i will add pictures separately.
AC sim schematic, CL=1.5p
|