Phased locked loop integrated circuit
First Claim
1. An oscillator system, comprising:
- a first integrated circuit; and
a second integrated circuit, wherein the second integrated circuit and the first integrated circuit comprise a same circuitry;
wherein each of the first integrated circuit and the second integrated circuit comprises;
phase locked loop (PLL) circuitry;
voltage controlled oscillator (VCO) circuitry; and
interface circuitry;
wherein;
the PLL circuitry of the first integrated circuit is coupled to the VCO circuitry of the second integrated circuit; and
the interface circuitry of the first integrated circuit controls calibration of the VCO circuitry of the second integrated circuit;
wherein the PLL circuitry comprises;
a reference signal input terminal;
a reference frequency divider circuit coupled to the reference signal input terminal;
a reference signal output terminal;
a switch coupled to the reference frequency divider circuit and to the reference signal output terminal, the switch configured to switchably connect the reference frequency divider circuit to the reference signal output terminal;
a phase detector coupled to the reference frequency divider circuit;
a charge pump coupled to the phase detector; and
a charge pump output terminal coupled to the charge pump.
1 Assignment
0 Petitions
Accused Products
Abstract
An integrated circuit includes phase locked loop (PLL) circuitry, voltage controlled oscillator (VCO) circuitry, and interface circuitry. The PLL circuitry includes a reference signal input terminal, a reference frequency divider circuit, a reference signal output terminal, a switch, a phase detector, a charge pump, and a control voltage output terminal. The reference frequency divider circuit is coupled to the reference signal input terminal. The switch is coupled to the reference frequency divider circuit and to the reference signal output terminal. The switch is configured to switchably connect the reference frequency divider circuit to the reference signal output terminal. The VCO circuitry includes a control voltage input terminal, a VCO, calibration circuitry, and a calibration input/output (I/O) terminal. The VCO is coupled to the control voltage input terminal. The calibration circuitry is coupled to the VCO. The calibration I/O terminal is coupled to the calibration circuitry.
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Citations
7 Claims
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1. An oscillator system, comprising:
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a first integrated circuit; and a second integrated circuit, wherein the second integrated circuit and the first integrated circuit comprise a same circuitry; wherein each of the first integrated circuit and the second integrated circuit comprises; phase locked loop (PLL) circuitry; voltage controlled oscillator (VCO) circuitry; and interface circuitry; wherein; the PLL circuitry of the first integrated circuit is coupled to the VCO circuitry of the second integrated circuit; and the interface circuitry of the first integrated circuit controls calibration of the VCO circuitry of the second integrated circuit; wherein the PLL circuitry comprises; a reference signal input terminal; a reference frequency divider circuit coupled to the reference signal input terminal; a reference signal output terminal; a switch coupled to the reference frequency divider circuit and to the reference signal output terminal, the switch configured to switchably connect the reference frequency divider circuit to the reference signal output terminal; a phase detector coupled to the reference frequency divider circuit; a charge pump coupled to the phase detector; and a charge pump output terminal coupled to the charge pump.
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2. An oscillator system, comprising:
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a first integrated circuit; and a second integrated circuit, wherein the second integrated circuit and the first integrated circuit comprise a same circuitry; wherein each of the first integrated circuit and the second integrated circuit comprises; phase locked loop (PLL) circuitry comprising; a reference signal input terminal; a reference frequency divider circuit; a reference signal output terminal; and a switch configured to switchably connect an output of the reference frequency divider circuit to the reference signal output terminal; and voltage controlled oscillator (VCO) circuitry; wherein; the PLL circuitry of the first integrated circuit is coupled to the VCO circuitry of the second integrated circuit; and the reference signal output terminal of the first integrated circuit is coupled to the reference signal input terminal of the second integrated circuit. - View Dependent Claims (3, 4, 5, 6, 7)
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Specification