Control circuit for a complementary metal-oxide semiconductor voltage controlled oscillator
First Claim
1. A complementary metal-oxide semiconductor (CMOS) voltage controlled oscillator (VCO) comprising:
- a plurality of variable delay elements connected in a ring configuration;
each variable delay element including at least two CMOS current source transistors operable in a differential mode to establish a signal delay through the variable delay element in response to a differential control signal with two components; and
a control circuit having a first section for generating a control current, and a pair of current mirror sections, the current mirror sections connected, in parallel, to the first section for dividing the control current, each current mirror section including at least one CMOS transistor configured as a current mirror to provide a respective component of the differential control signal.
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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. The control circuit provides the differential control voltage. The control circuit includes a first section for generating a control current and a pair of current mirror sections that divide the control current, generating a pair of differential control signal components as VGS potentials of a pair of CMOS transistors configured as current mirrors.
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Citations
10 Claims
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1. A complementary metal-oxide semiconductor (CMOS) voltage controlled oscillator (VCO) comprising:
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a plurality of variable delay elements connected in a ring configuration; each variable delay element including at least two CMOS current source transistors operable in a differential mode to establish a signal delay through the variable delay element in response to a differential control signal with two components; and a control circuit having a first section for generating a control current, and a pair of current mirror sections, the current mirror sections connected, in parallel, to the first section for dividing the control current, each current mirror section including at least one CMOS transistor configured as a current mirror to provide a respective component of the differential control signal. - View Dependent Claims (2, 3, 4, 5)
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6. A monolithic complementary metal-oxide semiconductor (CMOS) integrated circuit (IC) device, 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 at least two CMOS transistors operable in a differential mode to establish a signal delay through the variable delay element in response to a differential control signal with two components; and a control circuit having a first section for generating a control current, and a pair of current mirror sections, the current mirror sections connected, in parallel, to the first section for dividing the control current, each current mirror section including at least one CMOS transistor configured as a current mirror to provide a respective component of the differential control signal. - View Dependent Claims (7, 8, 9, 10)
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Specification