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US 11,848,649 B2Granted
Low power VB class AB amplifier with local common mode feedback
AssigneeMicron Technology, Inc.
InventorsZhi Qi Huang, Wei Lu Chu
Life of this patent
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Abstract
An amplifier includes a first stage and a second stage. The first stage includes a floating current source to maintain current within a threshold. The first stage also includes a local common mode feedback configured to provide gain to an input signal. Moreover, the second stage includes a driver that provides a load current to a load coupled to the amplifier.
Claims19
An amplifier, comprising:
- a first stage, comprising:
- a floating current source configured to maintain current within a threshold;
- and
- a local common mode feedback configured to provide gain to an input signal, wherein the local common mode feedback is configured to provide a dual-ended output;
- and
- a second stage comprising a driver, the driver configured to provide a load current to a load coupled to the amplifier.
3 more elements
A method, comprising:
- receiving an input signal at a push-pull amplifier;
- applying a bias current to a floating current source of the push-pull amplifier using a pair of current mirror transistors coupled to an output of the push-pull amplifier;
- applying a gain to the input signal using at least a local common mode feedback;
- and
- sending an output signal based at least in part on the input signal and the gain.
2 more elements
A dual-stage amplifier, comprising:
- an integrated operational transconductance (OTA) and buffer stage, comprising:
- a floating current source of a positive gate signal and a negative gate signal disposed between a first transistor and a second transistor of a current mirror pair of transistors;
- and
- a local common mode feedback circuit configured to provide gain to an input signal and decrease bias current;
- and
- a driver stage comprising a driver, the driver is configured to provide the input signal with gain as an output signal to a load coupled to the dual-stage amplifier.
3 more elements
Dependencies are inferred from the claim text.