| Author |
Message |
wateror
Joined: 26 Aug 2007
Posts: 62
|
 06 Aug 2008 3:10 buffer amplifier for test pins! |
|
|
|
| I put some test pins in my analog circuits, so I need some unit-gain buffer to drive the capacitance of the test pins. However, I found it's hard to design a buffer with high input common mode range, high output swing and good precision.. So is there any trade-off between these requirements? and what kind of architecture do we use usuallly?
|
|
| Back to top |
|
 |
nus_lin
Joined: 17 Feb 2005
Posts: 26
Helped: 1
|
| 06 Aug 2008 14:17 Re: buffer amplifier for test pins! |
|
|
|
| never overdesign
|
|
| Back to top |
|
|
ricklin
Joined: 20 Feb 2006
Posts: 79
Helped: 9
|
| 07 Aug 2008 16:51 buffer amplifier for test pins! |
|
|
|
| If no low loading resistance 2 stage OPAMP with negative feedback is ok or you can use super source follower, however input CM range and output THD at high swing is hard to trade off.
|
|
| Back to top |
|
|
jecyhale
Joined: 19 Feb 2008
Posts: 447
Helped: 46
Location: China
|
| 26 Aug 2008 10:28 Re: buffer amplifier for test pins! |
|
|
|
If you don't care the current, source follow is the best.
Just a NMOS and a NMOS current source.
|
|
| Back to top |
|
|
