Sep 14, 2014 #1 G gggould Member level 3 Joined Apr 10, 2004 Messages 63 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 532 Hi, Does anyone know how are those 2 resistors in the middle helping performance? And how to choose the proper values? https://obrazki.elektroda.pl/4548811900_1410668669.jpg Thanks.
Hi, Does anyone know how are those 2 resistors in the middle helping performance? And how to choose the proper values? https://obrazki.elektroda.pl/4548811900_1410668669.jpg Thanks.
Sep 14, 2014 #2 Dominik Przyborowski Advanced Member level 4 Joined Jun 6, 2013 Messages 1,210 Helped 505 Reputation 1,015 Reaction score 506 Trophy points 1,393 Location Norway Activity points 9,311 This two resistors forming a local common mode fedback setting constant gate potential for M0 and M1. The better AC performance is obtained by setting R value below 1/gm0 - this moving pole bounded with cgs of M0, M1 in higher frequencies.
This two resistors forming a local common mode fedback setting constant gate potential for M0 and M1. The better AC performance is obtained by setting R value below 1/gm0 - this moving pole bounded with cgs of M0, M1 in higher frequencies.
Sep 14, 2014 #3 esp1 Advanced Member level 1 Joined Sep 4, 2007 Messages 402 Helped 139 Reputation 278 Reaction score 139 Trophy points 1,323 Location England Activity points 3,391 hi, Dominik has explained the function of those resistors, you may also find this LTSpice sim of your circuit interesting. The maximum signal amplitudes occur at the maximum resistor values. E Attachments AAesp01.gif 51.2 KB · Views: 72
hi, Dominik has explained the function of those resistors, you may also find this LTSpice sim of your circuit interesting. The maximum signal amplitudes occur at the maximum resistor values. E
Sep 16, 2014 #4 G gggould Member level 3 Joined Apr 10, 2004 Messages 63 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 532 Thanks for the response Dominik and esp1. That is very helpful. So another follow up, how does the original circuit different from this one, from cmrr and psrr point of view? https://obrazki.elektroda.pl/1785936900_1410889835.jpg
Thanks for the response Dominik and esp1. That is very helpful. So another follow up, how does the original circuit different from this one, from cmrr and psrr point of view? https://obrazki.elektroda.pl/1785936900_1410889835.jpg