Closed loop polar modulation system with open loop option at low power levels
First Claim
Patent Images
1. A system comprising:
- a polar transmitter adapted to operate in an open loop mode of operation when an output power level of the polar transmitter is below a predetermined threshold and operate in a closed loop mode of operation when the output power level is above the predetermined threshold;
wherein the polar transmitter comprises;
a polar modulator adapted to modulate data to provide an amplitude modulation signal and a phase modulation signal, the polar modulator comprising a phase locked loop (PLL) providing the phase modulation signal and adapted to receive a feedback signal;
power amplifier circuitry adapted to amplify the phase modulation signal based on a variable supply voltage to provide an output signal;
power control circuitry adapted to provide the variable supply voltage based on the amplitude modulation signal;
feedback circuitry adapted to provide a signal corresponding to the output signal of the power amplifier circuitry; and
switching circuitry coupled to an output of the feedback circuitry to receive the signal corresponding to the output signal of the power amplifier circuitry and coupled to an output of a voltage controlled oscillator (VCO) of the PLL providing the phase modulation signal and adapted to provide the signal corresponding to the output signal of the power amplifier circuitry to the PLL as the feedback signal when operating in the closed loop mode of operation and provide the output of the VCO as the feedback signal when operating in the open loop mode of operation.
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Abstract
A polar transmitter that is configurable as either a closed loop polar transmitter or an open loop polar transmitter is provided. In general, the polar transmitter is configured as an open loop polar transmitter when operating at an output power level less than a predetermined threshold and as a closed loop polar transmitter when operating at an output power greater than the predetermined threshold.
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Citations
16 Claims
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1. A system comprising:
a polar transmitter adapted to operate in an open loop mode of operation when an output power level of the polar transmitter is below a predetermined threshold and operate in a closed loop mode of operation when the output power level is above the predetermined threshold;
wherein the polar transmitter comprises;a polar modulator adapted to modulate data to provide an amplitude modulation signal and a phase modulation signal, the polar modulator comprising a phase locked loop (PLL) providing the phase modulation signal and adapted to receive a feedback signal; power amplifier circuitry adapted to amplify the phase modulation signal based on a variable supply voltage to provide an output signal; power control circuitry adapted to provide the variable supply voltage based on the amplitude modulation signal; feedback circuitry adapted to provide a signal corresponding to the output signal of the power amplifier circuitry; and switching circuitry coupled to an output of the feedback circuitry to receive the signal corresponding to the output signal of the power amplifier circuitry and coupled to an output of a voltage controlled oscillator (VCO) of the PLL providing the phase modulation signal and adapted to provide the signal corresponding to the output signal of the power amplifier circuitry to the PLL as the feedback signal when operating in the closed loop mode of operation and provide the output of the VCO as the feedback signal when operating in the open loop mode of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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providing a polar transmitter adapted to operate in either an open loop mode of operation or a closed loop mode of operation wherein providing the polar transmitter comprises; providing a polar modulator adapted to modulate data to provide an amplitude modulation signal and a phase modulation signal, the polar modulator comprising a phase locked loop (PLL) providing the phase modulation signal and adapted to receive a feedback signal; providing power amplifier circuitry adapted to amplify the phase modulation signal based on a variable supply voltage to provide an output signal; providing power control circuitry adapted to provide the variable supply voltage based on the amplitude modulation signal; providing a signal corresponding to the output signal of the power amplifier circuitry to the PLL as the feedback signal when operating in the closed loop mode of operation; and providing an output of a voltage controlled oscillator (VCO) of the PLL to the PLL as the feedback signal when operating in the open loop mode of operation; and operating the polar transmitter in the open loop mode of operation when an output power level of the polar transmitter is below a predetermined threshold; and operating the polar transmitter in the closed loop mode of operation when the output power level is above the predetermined threshold. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification