Phase Detector
First Claim
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1. A phase detector, comprising:
- a plurality of phase detectors located in a phase correction loop, each phase detector configured to receive as input a radio frequency (RF) input signal and an RF reference signal, each of the plurality of phase detectors also configured to provide a signal representing a different phase offset based on the phase difference between the RF input signal and the RF reference signal; and
a switch configured to receive an output of each of the plurality of phase detectors and configured to select the output representing the phase offset, that is closest to a phase of an output of an amplifier.
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Abstract
A phase detector includes a plurality of phase detectors located in a phase correction loop, each phase detector configured to receive as input a radio frequency (RF) input signal and an RF reference signal, each of the plurality of phase detectors also configured to provide a signal representing a different phase offset based on the phase difference between the RE input signal and the RF reference signal; and a switch configured to receive an output of each of the plurality of phase detectors and configured to select the output representing the phase offset, that is closest to a phase of an output of an amplifier.
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Citations
22 Claims
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1. A phase detector, comprising:
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a plurality of phase detectors located in a phase correction loop, each phase detector configured to receive as input a radio frequency (RF) input signal and an RF reference signal, each of the plurality of phase detectors also configured to provide a signal representing a different phase offset based on the phase difference between the RF input signal and the RF reference signal; and a switch configured to receive an output of each of the plurality of phase detectors and configured to select the output representing the phase offset, that is closest to a phase of an output of an amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for selecting a phase detector output, comprising:
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generating a plurality of signals representing signals that are separated in phase by a predetermined amount; selecting one of the signals; comparing a signal having a phase opposite in phase than the selected signal with two adjacent signals, one of the two adjacent signals indicating a phase that is adjacent the selected signal in a first direction and the other of the two adjacent signals indicating a phase that is adjacent the selected signal in a second direction; and choosing the selected signal as an output of the phase detector if a value of the signal indicating a phase opposite in phase than the selected signal lies between the values of the two adjacent signals. - View Dependent Claims (11, 12, 13)
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14. A portable transceiver having a phase detector, comprising:
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a transmitter coupled to a receiver; a power amplifier associated with the transmitter, the power amplifier having a linear control characteristic, the power amplifier configured to amplify a phase-modulated (PM) signal according to the amplitude of an amplitude-modulated (AM) signal; a feedback signal taken from the power amplifier; a limiter configured to receive the feedback signal; a phase detector comprising; a plurality of phase detectors located in a phase correction loop, each phase detector configured to receive as input a radio frequency (RF) input signal and an RF reference signal, each of the plurality of phase detectors also configured to provide a signal representing a different phase offset based on the phase difference between the RF input signal and the RF reference signal; and a switch configured to receive an output of each of the plurality of phase detectors and configured to select the output representing the phase offset that is closest to a phase of an output of an amplifier. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification