CLOSED-LOOP DIGITAL POWER CONTROL FOR A WIRELESS TRANSMITTER
First Claim
1. A wireless transceiver having a receiver core coupled to a power amplifier, comprising:
- power detection circuitry coupled to an output of the power amplifier for providing a detected power level and a reference power level;
analog to digital conversion circuitry for converting the detected power level into a digital power level and for converting the reference power level into a digital reference power level;
a power signal processor for subtracting the digital reference power level from the digital power level, and for providing a feedback power signal corresponding to the difference between the digital power level and the digital reference power level; and
,a power correction circuit for providing a gain control signal corresponding to a difference between a variable power level signal and the feedback power signal, a transmit core of the wireless transceiver adjusting an output gain in response to the power control signal.
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Accused Products
Abstract
A closed loop power output calibration system for variable power output wireless devices. The wireless device includes a wireless transceiver having a transmit core coupled to a discrete power amplifier. Power detection circuitry formed in the wireless transceiver provides a detected power level of the power amplifier, and a reference power level, both of which are converted to digital signals using existing I and Q signal analog to digital converters in the receiver core. The digital signals are processed to cancel power distortion and temperature effects to provide a resulting power feedback signal. Corrective control signals are generated in response to the power feedback signal relative to a desired power output level. The gain in the transmit core is then adjusted in response to the corrective control signals such that the power amplifier outputs the target output power level.
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Citations
19 Claims
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1. A wireless transceiver having a receiver core coupled to a power amplifier, comprising:
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power detection circuitry coupled to an output of the power amplifier for providing a detected power level and a reference power level; analog to digital conversion circuitry for converting the detected power level into a digital power level and for converting the reference power level into a digital reference power level; a power signal processor for subtracting the digital reference power level from the digital power level, and for providing a feedback power signal corresponding to the difference between the digital power level and the digital reference power level; and
,a power correction circuit for providing a gain control signal corresponding to a difference between a variable power level signal and the feedback power signal, a transmit core of the wireless transceiver adjusting an output gain in response to the power control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A wireless device comprising:
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a power amplifier coupled to an antenna; and
,a wireless transceiver coupled to a power amplifier, the wireless transceiver including a transmit core for providing an output radio frequency signal having an output gain in response to a gain control signal, the output radio frequency signal being provided to the power amplifier, power detection circuitry coupled to an output of the power amplifier for providing a detected power level and a reference power level; a receiver core having analog to digital conversion circuitry for converting the detected power level into a digital power level and for converting the reference power level into a digital reference power level; a power signal processor for subtracting the digital reference power level from the digital power level, and for providing a feedback power signal corresponding to the difference between the digital power level and the digital reference power level, and a power correction circuit for providing the gain control signal corresponding to a difference between a variable power level signal and the feedback power signal.
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Specification