US 7,248,117 B1 · Frequency compensation architecture for stable high frequency operation

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.

Claims26

Dependent claims

An operational transconductance amplifier (OTA), comprising:

a first amplifier circuit that generates a first bias;
a second amplifier circuit that receives said first bias and that generates a feedback signal, wherein said first amplifier circuit receives said feedback signal;
a Miller compensation circuit that receives said feedback signal and that generates a second bias;
and
an Ahuja compensation circuit that receives said first and second biases and said feedback signal and that generates a third bias,
wherein said second amplifier circuit receives said third bias.

3 more elements

Dependencies are inferred from the claim text.

Frequency compensation architecture for stable high frequency operation

Life of this patent

Frequency compensation architecture for stable high frequency operation

Life of this patent

Abstract

Claims26