promach
Advanced Member level 4
For the following variable gain amplifier circuit ,
1) Should Vout1 = RDID2 - RDID1 instead ?
2) Why "if I1 = 0, then Vout = +gmRD , and if I2 = 0, then Vout = −gmRD . For I1 = I2 , the gain drops to zero." ?
1) Should Vout1 = RDID2 - RDID1 instead ?
2) Why "if I1 = 0, then Vout = +gmRD , and if I2 = 0, then Vout = −gmRD . For I1 = I2 , the gain drops to zero." ?