Class A operational amplifier with area efficient MOS capacitor

Amplifiers – With semiconductor amplifying device – Including differential amplifier

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330292, H03F 345, H03F 114

Patent

active

057317399

ABSTRACT:
An operational amplifier with MOSFET's configured as capacitors provide frequency compensation over a large range of input frequencies is described. The operational amplifier has an differential amplifier stage with an inverting and an noninverting input. The difference of signals placed at the inverting and the noninverting inputs are amplified and place at the input of a folded cascode amplifier stage. The output of the folded cascode amplifier stage is the input to a linear amplifier stage. The output of the linear amplifier stage is connected to external loading circuitry. A first frequency compensation capacitor is connected between the output of the linear amplifier stage and a noninverted input of the folded cascode amplifier. A second frequency compensation capacitor is connected between the output of the linear amplifier stage and a virtual ground within the folded cascode amplifier stage. A power distribution and biasing network provides a power supply voltage source, a ground reference potential, a substrate voltage source, and a plurality of biasing voltage sources to said differential amplifier stage, said folded cascode amplifier stage, and said linear amplifier stage. The plurality of biasing voltage sources are adjusted such that the first and second compensation capacitors are biased in the cutoff region.

REFERENCES:
patent: 5079514 (1992-01-01), Mijuskovic
patent: 5410273 (1995-04-01), Brehmer et al.
patent: 5477190 (1995-12-01), Brehmer et al.
Ahuja, "Improved Frequency Compensation Techniques for CMOS Operational Amplifiers" IEEE Journal of Solid State Circuits, vol. SC-18, No. 6, pp. 76-80, Dec. 1983.
Chang et al, "Feed Forward Compensation Techniques for High Frequency CMOS Op-Amps" IEEE Journal of Solid State Circuits, vol. SC-25, No. 6, pp. 1590-1595, Dec. 1990.

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