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Negitive Voltage Switch for MMIC

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b4bb4ge

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I have a MMIC phase shifter that requires negative voltage to control what phase stat it is in (-3v on, 0v off).

My entire system runs off positive voltage (ie microprocessor and such), I do have access to -3v lines on the board but I was wondering if anyone knew a good, inexpensive (maybe mosfet or bjt) design that would allow positive control of a negative voltage.

What I really want to do is use the microprocessor to switch these -3v lines on and off?

I can't turn the supply on and off because I need to switch the bits there will be some bits on and other off.

Thanks,
Babbage
 

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