Oscillation Circuit, Oscillation Control Method, Phase-Locked Loop Circuit, and Electronic Device
AssigneeHuawei Technologies Co., Ltd.
InventorKai Shi
Life of this patent
Estimating the term…
Abstract
An amplitude comparison circuit, a voltage control circuit, an adjustable power source, and an oscillator are disposed in an oscillation circuit. In a first time period, an amplitude of an oscillation signal is obtained, and a first control voltage is generated based on the amplitude. The first control voltage when the amplitude is constant is obtained as a target control voltage, and is stored. After the first time period, during subsequent operation of the oscillator, the voltage control circuit controls, by using the target control voltage, the adjustable power source to output a power supply voltage, and power is supplied to the oscillator at the power supply voltage.
Claims20
A circuit comprising:
- an adjustable power source configured to provide an input signal;
- an oscillator coupled to the adjustable power source and configured to output an oscillation signal based on the input signal;
- an amplitude comparison circuit separately coupled to the oscillator and the adjustable power source configured to output, in a first time period, a first control voltage to the adjustable power source based on an amplitude of the oscillation signal and a reference voltage;
- and
- a voltage control circuit separately coupled to the amplitude comparison circuit and the adjustable power source and configured to:
- obtain, in the first time period, a target control voltage that is the first control voltage when the amplitude is stabilized in the first time period;
- and
- control, after the first time period and by using the target control voltage, the adjustable power source to adjust the input signal.
A method comprising:
- controlling, in a first time period, an adjustable power source to provide an input signal to an oscillator;
- controlling, in the first time period, the oscillator to output an oscillation signal based on the input signal;
- outputting, in the first time period, a first control voltage to the adjustable power source based on an amplitude of the oscillation signal and a reference voltage;
- and
- controlling, in the first time period, a voltage control circuit to obtain a target control voltage that is the first control voltage when the amplitude is stabilized in the first time period;
- and
- controlling, after the first time period and by using the target control voltage, the voltage control circuit to control the adjustable power source to adjust the input signal.
A phase-locked loop circuit comprising:
- a filter;
- and
- a circuit configured to receive an input signal from the filter and comprising:
- an adjustable power source configured to provide the input signal;
- an oscillator coupled to the adjustable power source and configured to output an oscillation signal based on the input signal;
- an amplitude comparison circuit separately coupled to the oscillator and the adjustable power source and configured to output, in a first time period, a first control voltage to the adjustable power source based on an amplitude of the oscillation signal and a reference voltage;
- and
- a voltage control circuit separately coupled to the amplitude comparison circuit and the adjustable power source and configured to:
- obtain, in the first time period, a target control voltage that is the first control voltage when the amplitude is stabilized in the first time period;
- and
- control, after the first time period and by using the target control voltage, the adjustable power source to adjust the input signal.
Dependencies are inferred from the claim text.