Configurable frequency-locked loop/phase-locked loop oscillator
AssigneeTexas Instruments Incorporated
InventorsVishnu Ravinuthula, Peng Cao, Chienyu Huang
Life of this patent
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Abstract
An integrated circuit (IC) includes an oscillator circuit having a control input. A control circuit has a control output coupled to the control input. The control circuit is configured to generate a control signal to the control input of the oscillator circuit to cause: the oscillator circuit to be configured as a frequency-locked loop in response to the control signal being in a first state; and the oscillator circuit to be configured as a phase-locked loop in response to the control signal being in a second state.
Claims20
An integrated circuit (IC), comprising:
- an oscillator circuit having a control input;
- and
- a control circuit having a control output coupled to the control input, the control circuit configured to generate a control signal to the control input of the oscillator circuit to cause:
- the oscillator circuit to be configured as a frequency-locked loop in response to the control signal being in a first state;
- and
- the oscillator circuit to be configured as a phase-locked loop in response to the control signal being in a second state.
An integrated circuit (IC), comprising:
- an amplifier;
- a voltage-controlled oscillator (VCO);
- a first switch having a first switch control input, the first switch coupled between the amplifier and the VCO;
- a phase-frequency detector (PFD);
- a second switch having a second switch control input, the second switch coupled between the PFD and the VCO;
- and
- a control circuit having a first control output and a second control output, the first control output coupled to the first switch control input, and the second control output coupled to the second switch control input.
An integrated circuit (IC), comprising:
- an amplifier having an amplifier output;
- a capacitor;
- a first switch coupled between the amplifier output and the capacitor;
- a voltage-controlled oscillator (VCO) having a VCO input and a VCO output;
- a second switch coupled between the amplifier output and the VCO input;
- a frequency-to-voltage (F2V) converter having a converter input and a converter output, the converter input coupled to the VCO output;
- a phase-frequency detector (PFD) having a PFD output;
- a charge pump (CP) having a CP input and a CP output, the CP Input coupled to the PFD output;
- and
- a third switch coupled between the CP output and the VCO input.
Dependencies are inferred from the claim text.