Envelope power supply calibration of a multi-mode radio frequency power amplifier
First Claim
1. A method comprising:
- providing calibration equipment;
selecting one of a calibration mode and a normal operation mode;
providing a first radio frequency (RF) power amplifier (PA);
during the normal operation mode;
receiving and amplifying a first RF input signal using the first RF PA to provide a first RF output signal;
receiving an envelope power supply signal at the first RF PA, which provides power for amplification to the first RF PA; and
operating the first RF PA in one of a plurality of communication modes, wherein the envelope power supply signal has a minimum allowable magnitude based on a first saturation operating constraint, the communication mode of the first RF PA, and a desired magnitude of the first RF input signal; and
during the calibration mode;
providing the envelope power supply signal to the first RF PA;
providing a first plurality of magnitudes of the envelope power supply signal;
providing the first RF input signal, wherein the first RF PA operates in saturation;
receiving and amplifying the first RF input signal to provide the first RF output signal; and
measuring a magnitude of the first RF output signal at each of the first plurality of magnitudes of the envelope supply signal to obtain first calibration data, which is based on a first saturated operating characteristic of the first RF PA.
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Accused Products
Abstract
The present disclosure relates to envelope power supply calibration of a multi-mode RF power amplifier (PA) to ensure adequate headroom when operating using one of multiple communications modes. The communications modes may include multiple modulation modes, a half-duplex mode, a full-duplex mode, or any combination thereof. As such, each communications mode may have specific peak-to-average power and linearity requirements for the multi-mode RF PA. As a result, each communications mode may have corresponding envelope power supply headroom requirements. The calibration may include determining a saturation operating constraint based on calibration data obtained during saturated operation of the multi-mode RF PA. During operation of the multi-mode RF PA, the envelope power supply may be restricted to provide a minimum allowable magnitude based on an RF signal level of the multi-mode RF PA, the communications mode, and the saturation operating constraint to provide adequate headroom.
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Citations
5 Claims
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1. A method comprising:
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providing calibration equipment; selecting one of a calibration mode and a normal operation mode; providing a first radio frequency (RF) power amplifier (PA); during the normal operation mode; receiving and amplifying a first RF input signal using the first RF PA to provide a first RF output signal; receiving an envelope power supply signal at the first RF PA, which provides power for amplification to the first RF PA; and operating the first RF PA in one of a plurality of communication modes, wherein the envelope power supply signal has a minimum allowable magnitude based on a first saturation operating constraint, the communication mode of the first RF PA, and a desired magnitude of the first RF input signal; and during the calibration mode; providing the envelope power supply signal to the first RF PA; providing a first plurality of magnitudes of the envelope power supply signal; providing the first RF input signal, wherein the first RF PA operates in saturation; receiving and amplifying the first RF input signal to provide the first RF output signal; and measuring a magnitude of the first RF output signal at each of the first plurality of magnitudes of the envelope supply signal to obtain first calibration data, which is based on a first saturated operating characteristic of the first RF PA. - View Dependent Claims (2, 3, 4, 5)
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Specification