Operational amplifier with common-mode feedback amplifier circui

Details Operational amplifier with common-mode feedback amplifier circui Operational amplifier with common-mode feedback amplifier circui

1993-05-14

1994-06-14

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, H03F 345

Patent

active

053213700

ABSTRACT:
An operational amplifier circuit is formed by an operational amplifier stage having a balanced output function and a common-mode feedback amplifier stage. The common-mode feedback amplifier stage includes a first transistor pair which receives a reference voltage at their gates, a second transistor pair having gates connected respectively to a positive and a negative output of the operational amplifier stage, a transistor which receives at its gate an expected operating center voltage, and a current-mirror circuit for feeding-back an output feedback signal to the operational amplifier stage through a feedback path. The common-mode feedback amplifier stage of this invention makes it possible to stabilize the output voltages of the operational amplifier circuit and to enhance or widen an output dynamic range, without an addition of feedback circuit elements which are connected in series to the feedback path and in which voltage drop develops.

REFERENCES:
patent: 4933644 (1990-06-01), Fattaruso et al.
"Power-Supply Rejection in Different Switched-Capacitor Filters", De La Plaza et al., IEEE Journal of Solid-State Circuits, vol. 19, Dec. 1984.
"A Family of Differential NMOS Analog Circuits for a PCM Codec Filter Chip", D. Senderowicz et al., IEEE Journal of Solid-State Circuits, SC-17, No. 6, Dec. 1982.
"High-Frequency CMOS Switched Capacitor Filters for Communication Applications", by Tat C. Choy et al., IEEE International-Solid-State Circuits Conference, Session XVII, Precision Analog Components, Feb. 1983.
"A CMOS Analog Front-end Processor for an FDM System", K. R., Lakshmikumar et al., Proceedings of the IEEE 1990 Custom Integrated Circuits Conference, May 1990, Boston, US.

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