Voltage-controlled oscillator (vco) with lc circuit and series resistors
AssigneeTexas Instruments Incorporated
InventorsSrinivas THEERTHAM, Srikanth MANIAN, Uday Kiran MEDA
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Abstract
A system includes a data path and a phase-locked loop (PLL) coupled to the data path. The system also includes a voltage-controlled oscillator (VCO) coupled to the PLL. The VCO includes an LC circuit with first and second differential output terminals. The VCO also includes a first resistor coupled between the first differential output terminal and drain terminals of a first pair of complementary metal-oxide semiconductor (CMOS) transistors. The VCO also includes a second resistor coupled between the second differential output terminal and drain terminals of a second pair of CMOS transistors.
Claims12
A system, comprising:
- a data path;
- a clock and data recovery (CDR) circuit coupled to the data path, the CDR circuit having a phase-locked loop (PLL) with a voltage-controlled oscillator (VCO), wherein the VCO includes:
- an LC circuit with first and second differential output terminals;
- a first resistor coupled between the first differential output terminal and drain terminals of a first pair of complementary metal-oxide semiconductor (CMOS) transistors;
- and
- a second resistor coupled between the second differential output terminal and drain terminals of a second pair of CMOS transistors.
An integrated circuit, comprising:
- a voltage-controlled oscillator (VCO) comprising:
- a first differential output terminal;
- a second differential output terminal;
- an LC circuit between the first and second differential output terminals, wherein the LC circuit includes an inductor in parallel with a capacitor;
- a first resistor coupled between the first differential output terminal and drain terminals of a first pair of complementary metal-oxide semiconductor (CMOS) transistors;
- and
- a second resistor coupled between the second differential output terminal and drain terminals of a second pair of CMOS transistors.
Dependencies are inferred from the claim text.