At startup, the plus end of Vx will be right on the rail. Running, there will be at least a few tens of millivolts headroom. I may run the op amps off a charge pump. That will get rid of trying to squeeze in a voltage follower against the upper rail.
How about a "flying capacitor" to transfer Vx to some more usable operating point?
...Jim Thompson
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| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
I could do the switching using an IR2153 to drive four nmos.
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