Optimal switching frequency for envelope tracking power supply
First Claim
1. A radio frequency (RF) communications system configured to process RF signals associated with at least a first RF communications band and comprising:
- an RF power amplifier (PA) configured to receive and amplify an RF input signal to provide an RF transmit signal using an envelope power supply signal; and
an envelope tracking power supply configured to provide the envelope power supply signal, such that;
the first RF communications band has a first bandwidth;
the envelope power supply signal has switching ripple based on a programmable switching frequency;
the programmable switching frequency is selected to be greater than the first bandwidth;
a first guard band is adjacent to the first RF communications band, such that frequencies in the first guard band are greater than frequencies in the first RF communications band;
a first guard band-based bandwidth spans the first RF communications band and the first guard band; and
the programmable switching frequency is further selected to be greater than the first guard band-based bandwidth.
4 Assignments
0 Petitions
Accused Products
Abstract
A radio frequency (RF) communications system, which includes an RF power amplifier (PA) and an envelope tracking power supply, is disclosed. The RF communications system processes RF signals associated with at least a first RF communications band, which has a first bandwidth. The RF PA receives and amplifies an RF input signal to provide an RF transmit signal using an envelope power supply signal. The envelope tracking power supply provides the envelope power supply signal, which has switching ripple based on a programmable switching frequency. The programmable switching frequency is selected to be greater that the first bandwidth.
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Citations
23 Claims
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1. A radio frequency (RF) communications system configured to process RF signals associated with at least a first RF communications band and comprising:
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an RF power amplifier (PA) configured to receive and amplify an RF input signal to provide an RF transmit signal using an envelope power supply signal; and an envelope tracking power supply configured to provide the envelope power supply signal, such that; the first RF communications band has a first bandwidth; the envelope power supply signal has switching ripple based on a programmable switching frequency; the programmable switching frequency is selected to be greater than the first bandwidth; a first guard band is adjacent to the first RF communications band, such that frequencies in the first guard band are greater than frequencies in the first RF communications band; a first guard band-based bandwidth spans the first RF communications band and the first guard band; and the programmable switching frequency is further selected to be greater than the first guard band-based bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A radio frequency (RF) communications system configured to process RF signals associated with at least a first RF communications band and a second RF communications band, and comprising:
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an RF power amplifier (PA) configured to receive and amplify an RF input signal to provide an RF transmit signal using an envelope power supply signal; and an envelope tracking power supply configured to provide the envelope power supply signal, such that; the first RF communications band has a first bandwidth; the envelope power supply signal has switching ripple based on a programmable switching frequency; the programmable switching frequency is selected to be greater than the first bandwidth; and a second bandwidth spans the first RF communications band and the frequency gap, such that the programmable switching frequency is further selected to be less than the second bandwidth.
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19. A radio frequency (RF) communications system configured to process RF signals associated with at least a first RF communications band and comprising:
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RF front-end circuitry configured to receive and forward an RF receive signal, such that the RF receive signal is associated with the first RF communications band; an RF power amplifier (PA) configured to receive and amplify an RF input signal to provide an RF transmit signal using an envelope power supply signal; and an envelope tracking power supply configured to provide the envelope power supply signal, such that; the first RF communications band has a first bandwidth; the envelope power supply signal has switching ripple based on a programmable switching frequency; the programmable switching frequency is selected to be greater than the first bandwidth; and the RF communications system is further configured to process RF signals associated with the first RF communications band and a second RF communications band, such that the RF transmit signal is associated with the second RF communications band. - View Dependent Claims (20)
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21. A radio frequency (RF) communications system configured to process RF signals associated with at least a first RF communications band and comprising:
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RF front-end circuitry configured to receive and forward an RF receive signal, wherein the RF communications system is further configured to process RF signals associated with the first RF communications band and a second RF communications band, such that the RF receive signal is associated with the second RF communications band; an RF power amplifier (PA) configured to receive and amplify an RF input signal to provide an RF transmit signal using an envelope power supply signal; and an envelope tracking power supply configured to provide the envelope power supply signal, such that; the first RF communications band has a first bandwidth; the envelope power supply signal has switching ripple based on a programmable switching frequency; and the programmable switching frequency is selected to be greater than the first bandwidth. - View Dependent Claims (22)
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23. A method comprising:
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processing radio frequency (RF) signals associated with at least a first RF communications band receiving and amplifying an RF input signal to provide an RF transmit signal using an envelope power supply signal; and providing the envelope power supply signal, such that; the first RF communications band has a first bandwidth; the envelope power supply signal has switching ripple based on a programmable switching frequency; the programmable switching frequency is selected to be greater than the first bandwidth; a first guard band is adjacent to the first RF communications band, such that frequencies in the first guard band are greater than frequencies in the first RF communications band; a first guard band-based bandwidth spans the first RF communications band and the first guard band; and the programmable switching frequency is further selected to be greater than the first guard band-based bandwidth.
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Specification