Complementary metal-oxide semiconductor voltage controlled oscillator (CMOS VCO)
First Claim
1. A complementary metal-oxide semiconductor (CMOS) voltage controlled oscillator (VCO) comprising:
- a control means for producing a differential control signal; and
a plurality of variable delay elements connected in a ring configuration;
each variable delay element including first and second differential amplifier sections connected in parallel, each differential amplifier section including at least two CMOS transistors connected in a differential configuration, and a CMOS transistor current source connected to the at least two CMOS transistors and to the control means for operating the each differential amplifier section in response to a differential control signal, the first differential amplifier section having a first delay and second differential amplifier section having a second delay, the second delay being less than the first delay.
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Accused Products
Abstract
An integrated circuit complementary metal-oxide silicon (CMOS) voltage controlled oscillator (VCO) includes a plurality of variable delay elements, connected in a ring configuration, each variable delay element including a pair of parallel connected differential CMOS sections. The parallel-connected differential CMOS sections of each variable delay element are controlled by a differential control voltage whose magnitude sets relative levels of operation of the two differential sections of each variable delay element. These relative levels of operation determine the delay through the variable delay element. A current mirror circuit provides the differential control voltage.
64 Citations
20 Claims
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1. A complementary metal-oxide semiconductor (CMOS) voltage controlled oscillator (VCO) comprising:
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a control means for producing a differential control signal; and a plurality of variable delay elements connected in a ring configuration; each variable delay element including first and second differential amplifier sections connected in parallel, each differential amplifier section including at least two CMOS transistors connected in a differential configuration, and a CMOS transistor current source connected to the at least two CMOS transistors and to the control means for operating the each differential amplifier section in response to a differential control signal, the first differential amplifier section having a first delay and second differential amplifier section having a second delay, the second delay being less than the first delay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A monolithic complementary metal-oxide semiconductor (CMOS) integrated circuit (IC), comprising:
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a plurality of circuits; and at least one voltage-controlled oscillator (VCO) that includes; a plurality of variable delay elements connected in a ring configuration; each variable delay element including first and second differential amplifier sections connected in parallel, each differential amplifier section including at least two CMOS transistors connected in a differential configurations and a CMOS transistor current source connected to the at least two CMOS transistors and to the control means for operating each differential amplifier section in response to a differential control signal, the first differential amplifier section having a first delay and the second differential amplifier section having a second delay, the second delay being less than the first delay. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification