US 2026/0280496 A1 · HIGH LINEARITY TRANSCONDUCTANCE AMPLIFIER

Abstract

A high linearity transconductance amplifier includes a first transistor, a second transistor, two source resistors, a load, a common mode voltage (VCM) calibration device, and a VCM calibration circuit. The first and second transistors generate a pair of output currents to the load. The source resistors are coupled in series between source electrodes of the first and second transistors. The source electrodes of the first and second transistors have a first source voltage and a second source voltage respectively. The VCM calibration circuit compares an input common mode voltage with a reference voltage and counts based on the comparing result, thereby adjusting the input common mode voltage related to the first and second source voltages. The VCM calibration device provides a bias voltage to the load according to a system high voltage and the counting result of the VCM calibration circuit.

Claims20

Dependent claims

A high linearity transconductance amplifier, comprising:

a differential pair configured to receive a pair of input voltages to generate a pair of output currents, wherein the differential pair comprises a first transistor and a second transistor;
two source resistors coupled in series between a source electrode of the first transistor and a source electrode of the second transistor, wherein the source electrode of the first transistor has a first source voltage and the source electrode of the second transistor has a second source voltage;
a load coupled to the differential pair to receive the pair of output currents;
and
a common mode voltage (VCM) calibration circuit configured to compare an input common mode voltage with a reference voltage to generate a comparing result, wherein the VCM calibration circuit is further configured to count based on the comparing result, thereby adjusting the input common mode voltage related to the first source voltage and the second source voltage.

2 more elements

A high linearity transconductance amplifier, comprising:

a first transistor configured to receive a first input voltage to generate a first output current;
a second transistor configured to receive a second input voltage to generate a second output current, wherein the first transistor and the second transistor form a differential pair;
two source resistors coupled in series between a source electrode of the first transistor and a source electrode of the second transistor, wherein the source electrode of the first transistor has a first source voltage and the source electrode of the second transistor has a second source voltage;
a load coupled to the differential pair to receive the first output current and the second output current;
a VCM calibration device coupled to the load and biased under a system high voltage, thereby providing a bias voltage to the load;
and
a VCM calibration circuit configured to compare an input common mode voltage with a reference voltage to generate a comparing result;
wherein the VCM calibration device is configured to provide the bias voltage according to the comparing result, wherein the input common mode voltage is related to the first source voltage and the second source voltage.

5 more elements

Dependencies are inferred from the claim text.

High linearity transconductance amplifier

Life of this patent

High linearity transconductance amplifier

Life of this patent

Abstract

Claims20