Tunable Envelope Tracking
First Claim
1. An envelope tracking system to provide power management to a radio frequency power amplifier comprising:
- a DC to AC resonant power converter;
a tunable resonant network comprising a tunable reactive component;
a rectifier to provide high frequency AC to low frequency AC power conversion;
an output stage comprising an output filter;
a negative feedback to control said tunable resonant network;
wherein an impedance of said tunable resonant network is modulated by tuning said tunable reactive component to control an output voltage of said envelope tracking system to track an envelope signal.
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Accused Products
Abstract
A novel method to provide power management to a radio frequency amplifier is described. The method makes use of a DC-AC resonant switching power converter, a resonant tunable network and a rectifier to track the envelope signal of a radio amplifier system. This system provides a fast, efficient and clean supply to the radio frequency amplifier. The resonant power converter may be implemented with a class E inverter. The resonant power converter may be operated efficiently by switching at zero voltage switching or zero current switching. By operating the resonant switching power converter at the same frequency of the radio frequency amplifier, the spectrum of the power converter is immune from undesired harmonics while meeting the bandwidth requirement. By adaptively tuning the tunable resonant network, the output voltage of the rectifier is controlled to track the envelope signal.
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Citations
20 Claims
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1. An envelope tracking system to provide power management to a radio frequency power amplifier comprising:
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a DC to AC resonant power converter; a tunable resonant network comprising a tunable reactive component; a rectifier to provide high frequency AC to low frequency AC power conversion; an output stage comprising an output filter; a negative feedback to control said tunable resonant network; wherein an impedance of said tunable resonant network is modulated by tuning said tunable reactive component to control an output voltage of said envelope tracking system to track an envelope signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for providing power management to a radio frequency power amplifier comprising:
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receiving an input envelope signal; converting a DC voltage into an AC voltage by means of a resonant power converter; modulating an impedance of a tunable resonant network, wherein said tunable resonant network is comprising a tunable reactive component; converting a high frequency AC voltage to a low frequency AC voltage by means of a rectifier; filtering said low frequency AC signal by means of an output filter; wherein said output filter is comprising an output terminal; amplifying the voltage differential between an output voltage of said output terminal and said input envelope signal by means of an operational amplifier; regulating said output voltage with a negative feedback to control said tunable resonant network and to said amplifier; whereby said output voltage is tracking said input envelope signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A tunable resonant power converter comprising:
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a DC to AC resonant inverter; a tunable resonant network comprising a tunable reactive component; a rectifier; an output stage comprising an output filter and a load; a negative feedback to control said tunable resonant network; wherein an impedance of said tunable resonant network is modulated by tuning said tunable reactive component to control an output power into said load of said tunable resonant power converter. - View Dependent Claims (19, 20)
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Specification