VOLTAGE RIPPLE CANCELLATION IN A TRANSMISSION CIRCUIT
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United States of America Patent
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Issued Date -
Mar 27, 2025
app pub date -
Jan 9, 2023
filing date -
Jan 9, 2023
priority date (Note) -
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Abstract
Voltage ripple cancellation in a transmission circuit is provided. The transmission circuit includes a power amplifier circuit that amplifies a radio frequency (RF) signal based on a modulated voltage and a modulated current. Specifically, the modulated current is generated inside the power amplifier circuit based on a time-variant input power of the RF signal, and the modulated voltage is generated by an envelope tracking integrated circuit (ETIC) based on a time-variant target voltage and provided to the power amplifier circuit via a conductive path. Collectively, the ETIC and the conductive path present a total inductive impedance that interacts with the modulated current to cause a ripple in the modulated voltage at the power amplifier circuit. Herein, a transceiver circuit is configured to add a compensation term to the modulated target voltage to cancel the ripple in the modulated voltage to thereby improve overall RF performance of the transmission circuit.
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