US 2023/0421271 A1 · TRANSMITTER AND POWER CALIBRATION METHOD

Abstract

A transmitter includes a transmitter circuit, a calibration circuit, and a transmitter signal strength indicator circuit. The transmitter circuit is coupled to a power node to receive a supply voltage and transmits an output signal via an antenna. The calibration circuit senses a current of the power node when the transmitter circuit operates in a first frequency band and operates in a second frequency band to generate a signal having different values and generates a calibration signal according to the signals having the different values. The transmitter signal strength indicator circuit detects power of the output signal to generate a first detection signal, and generate a second detection signal according to the calibration signal and the first detection signal. The transmitter circuit adjusts the power of the output signal to be target power according to the second detection signal.

Claims20

Dependent claims

A transmitter, comprising:

a transmitter circuit coupled to a power node to receive a supply voltage and configured to transmit an output signal via an antenna;
a calibration circuit configured to sense a current of the power node to generate a first signal having a first value when the transmitter circuit operates in a first frequency band, sense the current to generate the first signal having a second value when the transmitter circuit operates in a second frequency band, and generate a calibration signal according to the first signal having the first value and the first signal having the second value;
and
a transmitter signal strength indicator circuit configured to detect power of the output signal to generate a first detection signal, and generate a second detection signal according to the calibration signal and the first detection signal,
wherein the transmitter circuit is further configured to adjust the power of the output signal to be target power according to the second detection signal.

2 more elements

A power calibration method, comprising:

sensing a current of a power node to generate a first signal having a first value when a transmitter circuit operates in a first frequency band, wherein the transmitter circuit is coupled to the power node to receive a supply voltage and is configured to transmit an output signal via an antenna;
sensing the current to generate the first signal having a second value when the transmitter circuit operates in a second frequency band;
generating a calibration signal according to the first signal having the first value and the first signal having the second value;
detecting power of the output signal to generate a first detection signal, and generating a second detection signal according to the calibration signal and the first detection signal;
and
adjusting the power of the output signal to be target power according to the second detection signal.

3 more elements

Dependencies are inferred from the claim text.

Transmitter and power calibration method

Life of this patent

Transmitter and power calibration method

Life of this patent

Abstract

Claims20