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US 10,594,263 B2Granted
Common-mode loop controlled fully-differential adaptive class-A amplifier
AssigneeSTMicroelectronics (Grenoble 2) SAS
InventorsFlavia Amorosa, Serge Ramet, Daniel Subiela
Life of this patent
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Abstract
In an embodiment, a differential amplifier includes: an input stage; an output stage coupled to the input stage, the output stage having first and second output terminals; and a feedback circuit coupled to the output stage, where the feedback circuit is configured to dynamically adjust a bias current of the output stage based on voltages of the first and second output terminals.
Claims23
A differential amplifier comprising:
- an input stage;
- an output stage coupled to the input stage, the output stage having first and second output terminals;
- and
- a feedback circuit coupled to the output stage, wherein the feedback circuit is configured to dynamically adjust a bias current of the output stage based on voltages of the first and second output terminals, wherein the output stage further comprises:
- a first output device coupled to the first output terminal, and
- a second output device coupled to the second output terminal, wherein the bias current comprises a first bias current flowing through the first output device and a second bias current flowing through the second output device.
3 more elements
A differential amplifier comprising:
- an input stage;
- an output stage coupled to the input stage, the output stage having first and second output terminals;
- and
- a feedback circuit coupled to the output stage, wherein the feedback circuit is configured to dynamically adjust a bias current of the output stage based on voltages of the first and second output terminals, wherein the feedback circuit is configured to increase the bias current when a common mode voltage at the first and second output terminals increases, wherein the feedback circuit comprises:
- a resistive network configured to generate a first voltage;
- and
- a comparator circuit configured to compare the first voltage with a reference voltage, and generate a first output based on the comparison, the first output configured to control the bias current.
4 more elements
A method comprising:
- receiving a differential input signal at an input stage of a differential amplifier;
- generating a differential output signal at an output stage of the differential amplifier based on the differential input signal;
- and
- dynamically adjusting a bias current of the output stage based on a common mode voltage of the differential output signal, wherein the bias current comprises a first bias current flowing through a first transistor coupled to a first output device of the output stage, the first output device coupled to a first output terminal, and a second bias current flowing through a second transistor coupled to a second output device of the output stage, the second output device coupled to a second output terminal, and wherein dynamically adjusting the bias current comprises controlling control terminals of the first and second transistors.
1 more element
A method comprising:
- receiving a differential input signal at an input stage of a differential amplifier;
- generating a differential output signal at an output stage of the differential amplifier based on the differential input signal;
- and
- dynamically adjusting a bias current of the output stage based on a common mode voltage of the differential output signal, wherein dynamically adjusting the bias current comprises increasing the bias current when the common mode voltage increases.
1 more element
A radio frequency (RF) receiver comprising:
- a low noise amplifier configured to be coupled to an antenna;
- a mixer circuit coupled to the low noise amplifier;
- a transimpedance amplifier (TIA) stage coupled to the mixer circuit;
- a complex bandpass polyphaser filter (CBPF) stage coupled to the TIA stage;
- and
- an analog-to-digital converter (ADC) coupled to the CBPF stage, wherein the TIA stage comprises a differential amplifier comprising:
- an input stage,
- an output stage coupled to the input stage, the output stage having first and second output terminals, and
- a feedback circuit coupled to the output stage, wherein the feedback circuit is configured to dynamically adjust a bias current of the output stage based on voltages of the first and second output terminals.
6 more elements
Dependencies are inferred from the claim text.