Load pump with an extremely wide output voltage

Details Load pump with an extremely wide output voltage Load pump with an extremely wide output voltage

2005-02-08

2005-02-08

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C327S157000, C327S546000, C331S017000, C331S025000

Reexamination Certificate

active

06853253

ABSTRACT:
The invention concerns a load pump device able to provide a constant current, respectively positive or negative, over an extremely wide output voltage range. A symmetrical switching system activates a first operational amplifier (AOP1) associated with the positive current source or a second amplifier (AOP2) associated with the negative current source according to predetermined threshold values (Vref), the first amplifier being provided so as to restore the behavior of the current mirror (M2,M1) generating a positive current when the output voltage of the device approaches the feed voltage (VDD) and the second amplifier being provided so as to restore the behavior of the current mirror (M4,M3) generating a negative current when the output voltage of the device approaches the earth (GND), thus allowing the output current of the device to be always constant and equal to a reference value (Iref).

REFERENCES:
patent: 5760640 (1998-06-01), Girard et al.
patent: 6107889 (2000-08-01), Strange et al.
patent: 6124755 (2000-09-01), Parker et al.
patent: 6611161 (2003-08-01), Kumar et al.
patent: 20020175723 (2002-11-01), Ruegg et al.
patent: 0778510 (1997-06-01), None

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