Multiphase frequency to voltage converter
AssigneeNXP USA, Inc.
InventorTrevor Mark Newlin
Life of this patent
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Abstract
A method for multiphase frequency to voltage conversion includes generating for each cycle of an oscillating input, one of a plurality of non-overlapping clocks. A respective voltage in proportion to an input frequency of the oscillating input, is generated in response to each of the non-overlapping clocks, with a respective one of a plurality of frequency to voltage converters. Each of the respective voltages is summated to generate a voltage sum proportional to the input frequency.
Claims15
A method for multiphase frequency to voltage conversion comprising:
- generating for each cycle of an oscillating input, one of a plurality of non-overlapping clocks;
- generating in response to each of the non-overlapping clocks, with a respective one of a plurality of frequency to voltage converters, a respective voltage in proportion to an input frequency of the oscillating input;
- and
- summating each of the respective voltages to generate a voltage sum proportional to the input frequency;
- wherein the plurality of non-overlapping clocks includes three non-overlapping clocks.
An apparatus comprising:
- a plurality of non-overlapping clocks, generated for each cycle of an oscillating input;
- a plurality of frequency to voltage converters configured to generate, in response to each of the non-overlapping clocks, a respective voltage in proportion to an input frequency of the oscillating input;
- and
- a summation circuit configured to summate each of the respective voltages to generate a voltage sum proportional to the input frequency;
- wherein the plurality of non-overlapping clocks comprises three non-overlapping clocks.
A method for multiphase frequency to voltage conversion for a Voltage Controlled Oscillator (VCO) system comprising:
- generating in response to each of a plurality of non-overlapping clocks, with a respective one of a plurality of frequency to voltage converters, a respective voltage in proportion to an input frequency of the oscillating input;
- summating each of the respective voltages to generate a voltage sum proportional to the input frequency;
- and
- controlling a VCO with an error voltage determined from a difference between the voltage sum and a voltage reference,
- wherein the VCO generates the oscillating input and is configured to startup in no more than one cycle of the oscillating input and
- wherein each of the non-overlapping clocks are generated by a shift register.
Dependencies are inferred from the claim text.