any idea about -1x cahrge pump

[sunking]

Hi,

how to realize -1x charge pump?
this is to say, such as a 2v voltage, wish to get -2v from it?
have any idea or paper?

 

[Btrend]

what's ur application? for power(large current) or reference only (small current) ?
1. if power applicaton, use buck-boost
2. if reference application, use switch cap technique, i.e. at Φ1 , apply 2v on one side (A) of a capacitor (A node to B node), and B connect to gnd.
at Φ2, short A to GND, leave B connect to load (high impedance) then B will be -2V after settled down.

 

[sunking]

for power application: output power is about 50mW.
The better circuit is charge pump, ie switch cap.
what is the suit process? CMOS or BiCMOS?

 

[johnsmith101]

Either process is fine. This can be done in a CMOS process.