Oscillator Voltage Switching for Low Phase Noise and Power
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Solution Overview
Problem
Existing oscillators face challenges in efficiently switching between modes with different power consumption levels without compromising the accuracy of temperature compensation and phase noise performance.
Innovation Solution
A circuit device and oscillator design that includes an oscillation circuit, temperature sensor, temperature compensation circuit, and control circuit, which allows switching between a low phase noise mode and low power consumption mode by controlling the power supply voltage and maintaining consistent reference voltages and currents across modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the power supply voltage to the oscillation circuit is increased to reduce phase noise, then phase noise performance is improved, but power consumption increases
Solution Approach 1:
The power supply voltage to the oscillation circuit is made dynamically adjustable based on operation mode. The control circuit switches between a first power supply voltage (higher) for low phase noise mode and a second power supply voltage (lower) for low power consumption mode, enabling dynamic optimization of the phase noise versus power consumption trade-off.
Solution Approach 2:
The invention changes the power supply voltage parameter to control phase noise characteristics. By adjusting the power supply voltage level, the oscillation circuit's phase noise performance is directly influenced, allowing optimization of noise characteristics through parameter modification.
2Use of energy by moving object
If the power supply voltage is changed to switch between modes, then power consumption is optimized, but temperature compensation accuracy may deteriorate
Solution Approach 1:
Different power supply voltages are applied to different circuits based on their specific requirements. The oscillation circuit receives higher voltage for low noise, while the temperature compensation circuit and temperature sensor receive stable reference voltages/currents to maintain measurement precision. This localized quality approach ensures each subsystem operates optimally.
Solution Approach 2:
The control circuit acts as an intermediary that manages power distribution. It receives mode selection signals and appropriately distributes power supply voltages to different circuits, ensuring that temperature compensation accuracy is preserved while enabling power consumption optimization in the oscillation circuit.
3Use of energy by moving object
If reference voltages or currents are adjusted based on power supply voltage changes, then power consumption is reduced, but temperature sensor and compensation circuit accuracy deteriorates
Solution Approach 1:
The invention applies different power supply strategies to different circuits. The temperature sensor and temperature compensation circuit receive stable reference voltages and currents that do not change with mode switching, while the oscillation circuit receives variable power supply voltage. This localized quality ensures measurement precision is maintained in sensing circuits while power consumption is optimized in the oscillation circuit.
Data Source
AI summary
A circuit device is configured to switching between a first mode in which phase noise of an output clock signal is low and a second mode in which power consumption is small, and includes an oscillation circuit configured to generate an oscillation signal, an output circuit configured to output the output clock signal, a temperature sensor configured to output a temperature detection signal, a temperature compensation circuit configured to perform temperature compensation on an oscillation frequency based on the temperature detection signal, and a control circuit. The control circuit performs control such that a power supply voltage supplied to the oscillation circuit in the first mode is higher than a power supply voltage supplied to the oscillation circuit in the second mode. In addition, the control circuit performs control such that at least one of a reference voltage supplied to the temperature compensation circuit and a reference current supplied to the temperature sensor does not change between the first mode and the second mode.