Differential operational amplifier

Details Differential operational amplifier Differential operational amplifier

2008-01-01

2008-01-01

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S260000

Reexamination Certificate

active

07315210

ABSTRACT:
The input stage of an operational amplifier includes at least four signal-receiving stages adapted to receive four primary input signals. If the voltage level associated with any of the input signal changes, at least one transistor in each of the at least four signal-receiving stages conducts more current and at least one transistor in each of these stages conducts less current. The four signal-receiving stages collectively generate at least four intermediate signals that are delivered to the output stage of the differential amplifier, which in response, generates a pair of differential output signals. Two of the input signals are derived from the pair of differential output signals and are fed back to control the amplifier.

REFERENCES:
patent: 5045804 (1991-09-01), Sugawara et al.
patent: 5858425 (1999-01-01), Murayama
patent: 6373317 (2002-04-01), Kostiainen et al.
Hogervorst et al., “A Compact Power-Efficient 3 V CMOS Rail-to-Rail Input/Output Operational Amplifier for VLSI Cell Libraries,”IEEE Journal of Solid-State Circuits, 29:12, Dec. 1994.

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