Low voltage and low power frequency synthesizer
First Claim
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1. A low voltage and low power frequency synthesizer including a variable divider phase locked loop for controlling the output frequency of a voltage controlled oscillator (VCO) comprising:
- memory means having information corresponding to a desired frequency and divisor information for the phase locked loop and the VCO; and
frequency capacitance switch means coupled between said memory and said VCO responsive to additional information to select a predetermined value of capacitance, said switch means including a plurality of capacitors from which the frequency capacitance switch means may select, said switch means further including means producing a course tuning frequency determining network of the VCO whereby a broad range of frequencies can be synthesized at lower voltages and maintained with lower power consumption with the phase locked loop operating to maintain the precision of the desired frequency.
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Abstract
A low power and low voltage frequency synthesizer includes a memory containing information to provide divisor information to the variable divider of a phase locked loop and information to select predetermined values of capacitance to connect to the frequency determining resonant network of the VCO to provide a coarse tuning. This tuning is then further modified by the normal operation of the phase locked loop.
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Citations
4 Claims
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1. A low voltage and low power frequency synthesizer including a variable divider phase locked loop for controlling the output frequency of a voltage controlled oscillator (VCO) comprising:
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memory means having information corresponding to a desired frequency and divisor information for the phase locked loop and the VCO; and frequency capacitance switch means coupled between said memory and said VCO responsive to additional information to select a predetermined value of capacitance, said switch means including a plurality of capacitors from which the frequency capacitance switch means may select, said switch means further including means producing a course tuning frequency determining network of the VCO whereby a broad range of frequencies can be synthesized at lower voltages and maintained with lower power consumption with the phase locked loop operating to maintain the precision of the desired frequency. - View Dependent Claims (2, 3, 4)
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Specification