Detecting amplifier out-of-range conditions

Details Detecting amplifier out-of-range conditions Detecting amplifier out-of-range conditions

2006-08-07

2008-09-23

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

C330S310000

Reexamination Certificate

active

07427898

ABSTRACT:
Out-of-range conditions are detected in amplifier CMOS or BiCMOS circuitry that includes a control transistor (MS) connected in series with a cascode transistor (MSC), and a differential amplifier (A1) with an inverting input connected to the node between the control transistor and the cascode transistor, a non-inverting input connected to a reference voltage source (VRDS) and an output connected to the gate of the cascode transistor (MSC). The voltage at the output of the differential amplifier (A1) is monitored, and an error condition is determined when the voltage exceeds or drops below a predetermined threshold value. The invention considerably widens the useful operating range, without requiring sophisticated or complex detection circuitry.

REFERENCES:
patent: 3927383 (1975-12-01), Fjarlie et al.
patent: 5451909 (1995-09-01), Fattaruso
patent: 6323703 (2001-11-01), Fotouhi
patent: 6590456 (2003-07-01), Yang
patent: 7015736 (2006-03-01), Sudjian et al.
patent: 7020793 (2006-03-01), Hsieh
patent: 7190230 (2007-03-01), Jin et al.

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