Temperature-Compensated Oscillator with Sample-and-Hold Power Control
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Solution Overview
Problem
Existing temperature-compensated crystal oscillators face issues with high power consumption and rapid frequency changes due to discrete capacitance variations, leading to increased costs and inaccurate temperature compensation.
Innovation Solution
A temperature-compensated oscillator design incorporating a temperature compensation circuit, a voltage-controlled oscillation circuit, a switch circuit for power control, and a sample-and-hold circuit to synchronize ON/OFF control and reduce power consumption, while maintaining accurate temperature compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature compensation circuit is continuously driven to maintain accurate temperature compensation, then the temperature compensation accuracy is improved, but the power consumption increases
Solution Approach 1:
The temperature compensation circuit operates periodically rather than continuously. A control circuit periodically activates the temperature compensation circuit based on temperature变化 conditions, allowing the circuit to remain inactive during stable temperature periods while maintaining compensation accuracy during temperature transitions, thus reducing overall power consumption while preserving compensation accuracy when needed
2Measurement precision
If the capacitance inside the oscillation circuit is varied to compensate for frequency deviation, then the temperature compensation accuracy is improved, but the frequency changes rapidly due to discrete capacitance changes
Solution Approach 1:
The system performs preliminary temperature measurement and predicts frequency deviation before it occurs. The control circuit calculates the required capacitance adjustment in advance and smoothly transitions the capacitance value, preventing rapid frequency changes while maintaining compensation accuracy through proactive rather than reactive adjustment
3Measurement precision
If the number of capacitors is increased to improve the accuracy of temperature compensation, then the temperature compensation accuracy is improved, but the cost increases
Solution Approach 1:
Instead of increasing the number of discrete capacitor components, the invention achieves higher compensation accuracy by digitally controlling the capacitance parameter. A variable capacitor with digital control allows continuous or fine-grained adjustment of capacitance values through software algorithms, providing high precision temperature compensation without increasing hardware complexity or cost
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces power consumption by synchronizing the ON/OFF control of the temperature compensation circuit and sample-and-hold circuit, stabilizing the temperature compensation voltage, and minimizing the load on the voltage-controlled oscillation circuit, thereby achieving accurate temperature compensation with lower power usage.
Implementation Method 1
a temperature compensation circuit (22) adapted to output a temperature compensation voltage based on the temperature measured
Implementation Method 2
a voltage-controlled oscillation circuit (12) adapted to perform temperature compensation of oscillation frequency based on the temperature compensation voltage
Data Source
AI summary
A temperature-compensated oscillator includes a temperature compensation circuit adapted to output a temperature compensation voltage, a voltage-controlled oscillation circuit on which temperature compensation is performed based on the temperature compensation voltage, a switch circuit adapted to perform ON/OFF control on power supply to the temperature compensation circuit, and a sample-and-hold circuit adapted to perform switching control between an ON state of outputting the temperature compensation voltage to the voltage-controlled oscillation circuit while being connected to the temperature compensation circuit and holding the temperature compensation voltage output from the temperature compensation circuit when the power is supplied to the temperature compensation circuit, and an OFF state of outputting the temperature compensation voltage held to the voltage-controlled oscillation circuit while cutting connection to the temperature compensation circuit when the power supply to the temperature compensation circuit is cut.