Systems and methods for suppressing and mitigating harmonic distortion in a circuit
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsFeng-Wei Kuo, Kai Xu, Robert Bogdan Staszewski
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Abstract
Systems and methods for suppressing and mitigating harmonic distortion in a circuit are disclosed. In one example, a disclosed circuit includes a radio frequency (RF) oscillator and a power amplifier. The RF oscillator is configured to generate an RF signal. The power amplifier is configured to generate an amplified RF signal based on the RF signal. The power amplifier includes a transformer including a primary winding and a secondary winding, and a feedback capacitor electrically coupled to the primary winding and the secondary winding.
Claims20
A circuit, comprising:
- a radio frequency (RF) oscillator configured to generate an RF signal, wherein the RF oscillator is a digitally controlled oscillator (DCO) that generates the RF signal according to an oscillator tuning word;
- a power amplifier configured to generate an amplified RF signal based on the RF signal, wherein the power amplifier comprises:
- a transformer including a primary winding and a secondary winding, and
- a feedback capacitor electrically coupled to the primary winding and the secondary winding;
- and
- a frequency divider that is coupled between the RF oscillator and the power amplifier, wherein:
- the frequency divider is configured to generate a clock signal having an average frequency representing a frequency of the RF signal divided by two.
A circuit, comprising:
- a radio frequency (RF) oscillator configured to generate an RF signal;
- and
- a power amplifier configured to generate an amplified RF signal based on the RF signal, wherein:
- the power amplifier comprises a first transformer including a first primary winding and a first secondary winding,
- the RF oscillator comprises a compensating circuit configured to control a bias voltage to mitigate a magnetic coupling with respect to at least one harmonic injection from the power amplifier to the RF oscillator.
A method for suppressing harmonic distortions of a power amplifier comprising a transformer and a feedback capacitor, comprising:
- generating a first signal having a harmonic distortion with respect to a given order harmonic at a primary winding of the transformer;
- sending the first signal through the feedback capacitor to generate a second signal at a secondary winding of the transformer, wherein the given order harmonic of the second signal is an inversion of the given order harmonic of the first signal;
- sending the second signal as a feedback to the primary winding through a magnetic coupling;
- and
- compensating the first signal with the second signal.
Dependencies are inferred from the claim text.