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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> problem with current mirror https://designers-guide.org/forum/YaBB.pl?num=1248446068 Message started by icekalt on Jul 24th, 2009, 7:34am |
Title: problem with current mirror Post by icekalt on Jul 24th, 2009, 7:34am Hello, When i simulated the circuit below, the drain current of transistor M5 is not equal to 100uA. What is the problem here? thx |
Title: Re: problem with current mirror Post by raja.cedt on Jul 24th, 2009, 8:07am hi, please check vds of M5..i think the problem is because of less common mode voltage.if you have less vds then please increase input common mode voltage. Thanks, Rajasekhar. |
Title: Re: problem with current mirror Post by icekalt on Jul 24th, 2009, 8:35am raja.cedt wrote on Jul 24th, 2009, 8:07am:
hello, Vds is 1.17687nV. |
Title: Re: problem with current mirror Post by boe on Jul 24th, 2009, 11:08am icekalt wrote on Jul 24th, 2009, 8:35am:
Then the transistor is not in saturation and therefor, will not act as current source. BOE |
Title: Re: problem with current mirror Post by raja.cedt on Jul 25th, 2009, 1:08am hi, so please increase vds of the tail transistor (just increase the common mode voltage) Thanks, rajasekhar. |
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