Temperature-Compensated Oscillator Startup Heating for Frequency Stability
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Solution Overview
Problem
Temperature-compensated oscillators face frequency deviations due to delayed thermal equilibrium between the integrated circuit and resonator, leading to instability in oscillation frequency immediately after startup.
Innovation Solution
The oscillator design includes a heat generating circuit that generates heat during an initial period after power supply startup, with varying current flow and heat generation amounts, and a layout that efficiently transmits heat to the resonator, ensuring rapid thermal equilibrium between the integrated circuit and resonator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the oscillator starts operating immediately after power supply, then the output signal is generated quickly, but the resonator temperature changes with delay causing frequency deviation
Solution Approach 1:
The patent applies preliminary action by generating heat in advance during a first period before the output circuit operates. The heat generating circuit is activated immediately after power supply to pre-heat the resonator, so that when the oscillation circuit starts operating, the resonator is already at the appropriate temperature, eliminating frequency deviation caused by thermal delay.
2Temperature
If the heat generating circuit operates continuously, then the resonator reaches thermal equilibrium quickly, but the power consumption increases
Solution Approach 1:
The patent implements periodic action by dividing the operation into distinct periods: a first period where the heat generating circuit operates to rapidly heat the resonator, and a second period where the heat generating circuit stops operating to reduce power consumption. This periodic switching allows the system to achieve thermal equilibrium quickly initially, then maintain it with lower power consumption.
3Productivity
If the output circuit operates immediately, then the oscillation signal is output quickly, but thermal equilibrium is lost causing frequency deviation
Solution Approach 1:
The patent applies preliminary action by having the heat generating circuit operate during a first period before the output circuit is activated in a second period. This preliminary heating ensures the resonator reaches thermal equilibrium before the oscillation signal is output, guaranteeing frequency accuracy from the start of signal output without delaying productivity.
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
This approach reduces frequency deviation at startup by accelerating the thermal equilibrium of the resonator, thereby stabilizing the oscillation frequency and improving the oscillator's performance.
Implementation Method 1
In the first period, a current flows through the heat generating circuit to generate heat
Implementation Method 2
a temperature sensor, a temperature compensation circuit that compensates for temperature characteristics of the resonator based on an output signal of the temperature sensor
Implementation Method 3
a temperature compensation circuit that compensates for temperature characteristics of the resonator based on an output signal of the temperature sensor
Data Source
AI summary
An oscillator includes a resonator and an integrated circuit, the integrated circuit includes an oscillation circuit that oscillates the resonator, a temperature sensor, a temperature compensation circuit that compensates for temperature characteristics of the resonator based on an output signal of the temperature sensor, an output circuit that receives a signal output from the oscillation circuit and outputs an oscillation signal, and a heat generating circuit, and in the heat generating circuit, a current flows in a first period after supply of a power supply voltage from the outside is started to generate heat and no current flows in the second period after the first period ends.