Harmonic suppressing local oscillator signal generation
First Claim
1. A transceiver, comprising:
- local oscillator (LO) signal circuitry configured to output an LO signal having an LO frequency, wherein each period of the LO signal is characterized by a duty cycle portion during which the LO signal includes at least two pulses configured to bias a switch, wherein the duty cycle has a duration that is less than an LO signal period, comprising;
selection circuitry configured to select a pulse pattern and a gap duration based at least on a target harmonic of the LO frequency to be suppressed, wherein the gap is characterized as a time interval during the duty cycle in which the LO signal has no content; and
generation circuitry configured to generate the LO signal characterized by each duty cycle portion comprising the selected pulse pattern and gap duration; and
mixer circuitry configured to input the LO signal and an information signal that encodes communication data and output a shifted signal that corresponds to the information signal shifted to a desired frequency.
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Abstract
A transceiver includes local oscillator (LO) signal circuitry configured to output an LO signal having an LO frequency and mixer circuitry configured to input the LO signal and an information signal that encodes communication data and output a shifted signal that corresponds to the information signal shifted to a desired frequency. The LO signal circuitry includes selection circuitry and generation circuitry. The selection circuitry is configured to select a pulse pattern and a gap duration based at least on a target harmonic of the LO frequency to be suppressed. The pulse pattern includes at least two pulses spaced apart by a gap having the gap duration. The generation circuitry is configured to generate an LO signal characterized by the selected pulse pattern and gap duration.
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Citations
23 Claims
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1. A transceiver, comprising:
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local oscillator (LO) signal circuitry configured to output an LO signal having an LO frequency, wherein each period of the LO signal is characterized by a duty cycle portion during which the LO signal includes at least two pulses configured to bias a switch, wherein the duty cycle has a duration that is less than an LO signal period, comprising; selection circuitry configured to select a pulse pattern and a gap duration based at least on a target harmonic of the LO frequency to be suppressed, wherein the gap is characterized as a time interval during the duty cycle in which the LO signal has no content; and generation circuitry configured to generate the LO signal characterized by each duty cycle portion comprising the selected pulse pattern and gap duration; and mixer circuitry configured to input the LO signal and an information signal that encodes communication data and output a shifted signal that corresponds to the information signal shifted to a desired frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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identifying a target harmonic of a first LO frequency that is likely to cause interference; generating an LO signal having the first LO frequency, wherein each period of the LO signal is characterized by a duty cycle portion during which the LO signal includes at least two pulses configured to bias a switch, wherein the duty cycle has a duration that is less than the LO signal period, wherein each duty cycle portion is further characterized by a pulse pattern comprising the at least two pulses spaced apart by at least one gap having a gap duration, wherein the gap is characterized as a time interval during the duty cycle in which the LO signal has no content, and further wherein the at least one gap is positioned such that the LO signal has no content at the target harmonic; and providing the LO signal to a mixer for shifting an information signal encoding communication data between a baseband frequency and an RF frequency. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. Local oscillator (LO) signal circuitry for use in a transceiver, the LO signal circuitry configured to output an LO signal having an LO frequency, comprising:
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generation circuitry configured to; generate the LO signal, wherein each period of the LO signal is characterized by duty cycle portion during which the LO signal includes at least two pulses configured to bias a switch, wherein the duty cycle is characterized by a pulse pattern and a gap duration, such that each duty cycle portion of the LO signal comprises the at least two pulses spaced apart by a gap having the gap duration, wherein the gap is characterized as a time interval during the duty cycle in which the LO signal has no content; and provide the LO signal to mixer circuitry configured to shift an information signal that encodes communication data to a desired frequency; and selection circuitry configured to; identify a target harmonic of the LO frequency that is likely to cause interference; select a pulse pattern and a gap duration based at least on the target harmonic; and control the generation circuitry based at least on the pulse pattern and gap duration to generate the LO signal. - View Dependent Claims (20, 21, 22, 23)
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Specification