Frequency compensation architecture for stable high frequency operation
First Claim
1. 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.
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Accused Products
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.
18 Citations
26 Claims
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1. An operational transconductance amplifier (OTA), comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An operational transconductance amplifier (OTA), comprising:
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first amplifying means for generating a first bias; second amplifying means for receiving said first bias and for generating a feedback signal, wherein said first amplifying means receives said feedback signal; first frequency compensation means for receiving said feedback signal and for generating a second bias; and second frequency compensation means for receiving said first and second biases and said feedback signal and for generating a third bias, wherein said second amplifying means receives said third bias. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for operating an operational transconductance amplifier (OTA), comprising:
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generating a first bias; generating a feedback signal based on said first bias; generating a second bias based on said feedback signal using Miller frequency compensation; and generating a third bias based on said first and second biases and said feedback signal using Ahuja frequency compensation. - View Dependent Claims (24, 25, 26)
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Specification