System and method for a startup circuit for a differential...

Details System and method for a startup circuit for a differential... System and method for a startup circuit for a differential...

2005-05-10

2005-05-10

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S258000

Reexamination Certificate

active

06891434

ABSTRACT:
A system is provided for correcting start-up deficiencies in an amplifier. The system includes a comparing device configured to (i) receive a second circuit node voltage and a reference voltage as inputs, (ii) compare the received second circuit node voltage and the reference voltage, and (iii) produce a compensating voltage signal based upon the comparison. Next, an active device has a control terminal connected to an output port of the comparing device and is configured to receive the compensating voltage signal. The active device also includes an output terminal connected to the control terminal of the second active device, and a common terminal connected to a first circuit node. Another active device has a control terminal connected to the output port of the comparing device and is configured to receive the compensating voltage signal. The other active device also has an output terminal connected to the control terminal of the first active device, and a common terminal connected to the first circuit node.

REFERENCES:
patent: 4024462 (1977-05-01), Highnote et al.
patent: 5283535 (1994-02-01), Sevenhans et al.
patent: 5493253 (1996-02-01), Ogou
patent: 6107882 (2000-08-01), Gabara et al.
patent: 6246289 (2001-06-01), Pisati et al.
patent: 6480066 (2002-11-01), Madni

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