Circuit having enhanced input signal range

Details Circuit having enhanced input signal range Circuit having enhanced input signal range

2006-03-30

2008-10-07

Pascal, Robert J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C327S563000

Reexamination Certificate

active

07432762

ABSTRACT:
A circuit having an enhanced input signal range includes a differential amplifier operative to receive at least first and second signals and to generate a difference signal at an output thereof which is a function of the difference between the first and second signals. The differential amplifier includes an input stage having at least first and second transistors having a first threshold voltage associated therewith and being operative to receive the first and second signals, respectively, and a load including at least third and fourth transistors having a second threshold voltage associated therewith, the first threshold voltage being greater than the second threshold voltage. The circuit further includes an output stage coupled to the differential amplifier and operative to receive the difference signal and to generate an output signal of the circuit that is indicative of the difference signal and is referenced to the supply voltage of the circuit.

REFERENCES:
patent: 4213098 (1980-07-01), Tsividis
patent: 5714906 (1998-02-01), Motamed et al.
patent: 5909146 (1999-06-01), Okada
patent: 6166978 (2000-12-01), Goto
patent: 6433637 (2002-08-01), Sauer
patent: 7030695 (2006-04-01), May et al.
patent: 7116171 (2006-10-01), Maekawa et al.
patent: 7154789 (2006-12-01), Kim et al.
patent: 2007/0057724 (2007-03-01), Koizumi et al.

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