Frequency compensation architecture for stable high...

Details Frequency compensation architecture for stable high... Frequency compensation architecture for stable high...

2007-07-24

2007-07-24

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000

Reexamination Certificate

active

11171026

ABSTRACT:
An operational transconductance amplifier includes a first amplifier circuit that generates a first bias. A second amplifier circuit receives the first bias and generates a feedback signal. The first amplifier circuit also receives the feedback signal. A Miller compensation circuit receives the feedback signal and generates a second bias. An Ahuja compensation circuit receives the first and second biases and the feedback signal and generates a third bias. The second amplifier circuit receives the third bias. A feedback loop has an open loop response with first and second poles and a zero that are located below a crossover frequency. The Miller compensation circuit increases a frequency difference between the first and second poles. The Miller compensation circuit also adjusts a frequency of one of the poles so that the zero cancels an effect of the pole on the open loop response.

REFERENCES:
patent: 5130666 (1992-07-01), Nicollini
patent: 6847260 (2005-01-01), Gupta et al.
patent: 7142056 (2006-11-01), Blecker et al.
Ahuja; an Improved Frequency Compensation Technique for CMOS Operational Amplifiers; IEEE Journal of Solid-State Circuits, vol. SC-18, No. 6, Dec. 1983; pp. 629-633.

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