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US 11,251,753 B2Granted
Envelope tracking supply modulator with zero peaking and associated envelope tracking calibration method and system
AssigneeMediatek Inc.
InventorsChen-Yen Ho, Yen-Liang Chen, Chien-Wei Kuan
Life of this patent
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Abstract
An envelope tracking supply modulator includes an amplifier circuit and a zero peaking circuit. The amplifier circuit receives an envelope input, generates a modulated supply voltage according to the envelope input, and provides the modulated supply voltage to a power amplifier. The zero peaking circuit is coupled to the amplifier circuit, and applies zero peaking to the amplifier circuit, where the zero peaking inserts a zero at a frequency.
Claims14
A wireless communication system comprising:
- a transmit (TX) circuit, arranged to receive a TX baseband signal, generate a radio-frequency (RF) signal according to the TX baseband signal, and output the RF signal via a power amplifier (PA);
- an envelope tracking circuit, arranged to derive an envelope input from the TX baseband signal, and generate a modulated supply voltage according to the envelope input, wherein the envelope tracking circuit comprises an envelope tracking supply modulator, and the envelope tracking supply modulator comprises:
- an amplifier circuit, arranged to receive the envelope input, generate the modulated supply voltage according to the envelope input, and provide the modulated supply voltage to the PA;
- and
- an adjustable zero peaking circuit, coupled to the amplifier circuit and arranged to apply zero peaking to the amplifier circuit, where said zero peaking inserts a zero at a frequency;
- a receive (RX) circuit, arranged to receive an output of the PA, and derive an RX baseband signal from the output of the PA;
- and
- an envelope tracking calibration circuit, arranged to calibrate the adjustable zero peaking circuit by analyzing the RX baseband signal.
5 more elements
An envelope tracking calibration method comprising:
- receiving a transmit (TX) baseband signal, generating a radio-frequency (RF) signal according to the TX baseband signal, and outputting the RF signal via a power amplifier (PA);
- deriving an envelope input from the TX baseband signal;
- generating, by an amplifier circuit, a modulated supply voltage according to the envelope input;
- providing the modulated supply voltage to the PA;
- applying zero peaking to the amplifier circuit, where said zero peaking inserts a zero at a frequency;
- receiving an output of the PA, and deriving a receive (RX) baseband signal from the output of the PA;
- and
- calibrating said zero peaking by analyzing the RX baseband signal.
5 more elements
An envelope tracking supply modulator comprising:
- an amplifier circuit, arranged to receive an envelope input, generate a modulated supply voltage according to the envelope input, and provide the modulated supply voltage to a power amplifier;
- an adjustable zero peaking circuit, coupled to the amplifier circuit and arranged to apply zero peaking to the amplifier circuit, where said zero peaking inserts a zero at a frequency to increase a bandwidth of the amplifier circuit;
- and
- a calibration circuit arranged to calibrate the adjustable zero peaking circuit.
1 more element
Dependencies are inferred from the claim text.