| Author |
Message |
pixel
Joined: 16 Sep 2004
Posts: 544
Helped: 54
|
 07 Jan 2008 17:35 Re: Differential Pair Transconductance!!! |
|
|
|
| ac simulation does not have any sense if dc operation points are not set.
|
|
| Back to top |
|
 |
analog_prodigy
Joined: 19 Jul 2007
Posts: 138
Helped: 12
|
| 09 Jan 2008 6:34 Differential Pair Transconductance!!! |
|
|
|
| How does vbp and vbn signals affecting the circuit?
|
|
| Back to top |
|
|
srinivasan
Joined: 07 Jan 2006
Posts: 11
|
| 12 Jan 2008 9:27 Re: Differential Pair Transconductance!!! |
|
|
|
How is the output quiescent voltage set ?. As of now, the output leg looks like two different current sources(PMOS and NMOS) trying to force the output node to some value, that is the problem. Your biasing circuit is technically correct but it is not replicating the output leg exactly, the vds variations will reflect as difference in currents between PMOS and NMOS output transistors and the output node voltage cannot be fixed.
What is the specification for which you have chosen this structure ? Can you mention the specifications ?
|
|
| Back to top |
|
|
jecyhale
Joined: 19 Feb 2008
Posts: 383
Helped: 37
Location: China
|
| 01 Apr 2008 8:03 Re: Differential Pair Transconductance!!! |
|
|
|
| Increase the Id of the differential pair.
|
|
| Back to top |
|
|
