Differential amplifier

Details Differential amplifier Differential amplifier

2006-09-26

2006-09-26

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S260000, C327S359000

Reexamination Certificate

active

07113040

ABSTRACT:
The input stage of an operational amplifier includes at least four signal-receiving stages adapted to receive four 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 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 the input stage of 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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