Transmitter with compensation of VCO pulling
AssigneeShenzhen Goodix Technology Co., Ltd.
InventorsAhmed Emira, Faisai Hussien, Esmail Babakrpur Nalousi
Life of this patent
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Abstract
A transmitter circuit is disclosed. The transmitter circuit includes a frequency circuit configured to generate a frequency signal, a power amplifier configured to drive an antenna with a drive signal according to the frequency signal, and a programmable delay circuit configured to controllably extend a propagation delay between the frequency signal generated by the frequency circuit and the drive signal of the power amplifier. The programmable delay circuit is programmed with a programming value which causes the transmitter circuit to pass a calibration test.
Claims17
A transmitter circuit, comprising:
- a frequency circuit configured to generate a frequency signal;
- a power amplifier configured to drive an antenna with a drive signal according to the frequency signal;
- a programmable delay circuit configured to controllably extend a propagation delay between the frequency signal generated by the frequency circuit and the drive signal of the power amplifier, wherein the programmable delay circuit is programmed with a programming value which causes the transmitter circuit to pass a calibration test;
- and
- a mixer coupled between the frequency circuit and the programmable delay circuit, wherein the mixer configured to modulate the frequency signal with a baseband information carrying signal.
A method of operating a transmitter circuit, the transmitter circuit comprising:
- a frequency circuit;
- a power amplifier;
- a programmable delay circuit;
- and
- a mixer coupled between the frequency circuit and the programmable delay circuit,
- the method comprising:
- with the frequency circuit, generating frequency signal;
- with the mixer, modulating the frequency signal with a baseband information carrying signal;
- with the power amplifier, driving an antenna with a drive signal according to the frequency signal;
- and
- with the programmable delay circuit, controllably extending a propagation delay between the frequency signal generated by the frequency circuit and the drive signal of the power amplifier, wherein the programmable delay circuit is programmed with a programming value which causes the transmitter circuit to pass a calibration test.
A method of operating a transmitter circuit, the transmitter circuit comprising:
- a frequency circuit;
- a power amplifier;
- a programmable delay circuit;
- and
- a mixer coupled between the frequency circuit and the programmable delay circuit,
- the method comprising:
- with the frequency circuit, generating a frequency signal;
- with the power amplifier, driving an antenna with a first drive signal according to the frequency signal modulated with a transmission baseband signal;
- with the mixer, modulating the frequency signal with the transmission baseband signal;
- with the programmable delay circuit, controllably extending a propagation delay between the frequency signal generated by the frequency circuit and the first drive signal of the power amplifier by a first amount, wherein the programmable delay circuit is programmed with a first programming value;
- with a receiver circuit, receiving the first drive signal and extracting a first received baseband signal from the received first drive signal;
- analyzing the first received baseband signal;
- determining that the first programming value does not cause the transmitter circuit to pass a calibration test;
- with the power amplifier, driving the antenna with a second drive signal according to the frequency signal modulated with the transmission baseband signal;
- with the programmable delay circuit, controllably extending a propagation delay between the frequency signal generated by the frequency circuit and the second drive signal of the power amplifier by a second amount, wherein the programmable delay circuit is programmed with a second programming value;
- with the receiver circuit, receiving the second drive signal and extracting a second received baseband signal from the received second drive signal;
- analyzing the second received baseband signal;
- and
- determining that the second programming value causes the transmitter circuit to pass the calibration test.
Dependencies are inferred from the claim text.