Jim Thompson
Wrote in message:
Anyone have ideas regarding how to implement a voltage-variable phase
shifter useable at 210MHz?

...Jim Thompson
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| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.


Do you remember the MXR Phase 90? It was a guitar effects pedal
that used a chain of op amp all-pass filters:

http://en.m.wikipedia.org/wiki/All-pass_filter

as a phase shift network and a JFET as a voltage variable
resistance in parallel with the resistor to ground to vary the
phase.

Could one build something similar just for a higher frequency,
maybe? 500 MHz GBW op amps are not terribly expensive these days;
use PHEMTs as the variable resistance elements?

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