Smooth voltage regulation transition circuit having fast...

Details Smooth voltage regulation transition circuit having fast... Smooth voltage regulation transition circuit having fast...

2006-08-08

2006-08-08

Sircus, Brian (Department: 2836)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Connecting or disconnecting

C307S075000

Reexamination Certificate

active

07088015

ABSTRACT:
A power supply switching circuit arrangement is configured to provide a relatively smooth (low noise) power supply switch-over during the transition between active and quiescent modes. Complementary inputs of an operational amplifier are selective coupled to feedback paths to the amplifier and the power supply switching circuit arrangement, so as to bias a switching transistor during system active mode at a value that is just slightly below the turn-on voltage of the transistor. This means that turning on the switching transistor for the purpose of providing quiescent mode powering of the utility device requires only a small transition in control voltage from an active mode ‘almost turned-on’ level.

REFERENCES:
patent: 5280233 (1994-01-01), Poletto et al.
patent: 5631606 (1997-05-01), Tran
patent: 5811895 (1998-09-01), Suzuki et al.
patent: 5914681 (1999-06-01), Rundel
patent: 6118188 (2000-09-01), Youssef
patent: 6259171 (2001-07-01), Cheng
patent: 6600365 (2003-07-01), Frith
patent: 6958596 (2005-10-01), Sferrazza et al.

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