Oscillator Temperature Compensation Across Output Current States
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Solution Overview
Problem
Existing circuit apparatuses that generate clock signals using resonators, such as quartz crystal resonators, do not adequately compensate for the frequency-temperature characteristic when the output circuit operates in different states, leading to deviations in temperature compensation.
Innovation Solution
A circuit apparatus that includes a clock signal generation circuit, an output circuit capable of operating in multiple states with different consumption currents, and a temperature compensation circuit. The temperature compensation circuit generates distinct temperature compensation signals for each state of the output circuit, ensuring accurate frequency-temperature compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single temperature compensation signal is used regardless of output circuit state, then the device complexity is reduced, but the temperature compensation accuracy deteriorates due to different consumption currents in different states
Solution Approach 1:
The temperature compensation circuit dynamically switches between different compensation signals (first temperature compensation signal and second temperature compensation signal) based on the operation state of the output circuit. This dynamic adaptation allows the system to maintain high compensation accuracy across different consumption current states without requiring a completely separate compensation circuit for each state.
Solution Approach 2:
The invention changes the compensation parameter (temperature compensation signal) according to the operation state of the output circuit. By detecting which state the output circuit is in (first state or second state with different consumption currents), the system selects the appropriate compensation signal to maintain accuracy without increasing overall device complexity.
2Reliability
If the temperature compensation circuit is simplified to use a single compensation signal, then the ease of operation is improved, but the reliability of clock signal generation deteriorates due to inaccurate compensation under varying consumption currents
Solution Approach 1:
The temperature compensation circuit incorporates feedback from the operation state of the output circuit to select the appropriate compensation signal. This feedback mechanism ensures that the system automatically adapts to different consumption current states, maintaining reliable clock signal generation without requiring manual intervention or complex operation from the user.
3Measurement precision
If distinct temperature compensation signals are generated for each output circuit state, then the frequency-temperature characteristic compensation accuracy is improved, but the device complexity increases
Solution Approach 1:
The temperature compensation circuit uses dynamic switching based on the operation state to select between different compensation signals. This approach achieves high compensation accuracy for each state while avoiding the need for completely separate compensation circuits, thereby limiting the increase in device complexity to only the necessary switching mechanism.
Data Source
AI summary
A circuit apparatus includes a clock signal generation circuit configured to generate a clock signal by a resonator, an output circuit configured to operate in a first state or a second state in which a consumption current is different from that in the first state and output an output clock signal, and a temperature compensation circuit configured to compensate for a frequency-temperature characteristic of the clock signal based on a temperature detection signal. When the output circuit operates in the first state, the temperature compensation circuit outputs a first temperature compensation signal that compensates for a frequency-temperature characteristic when the output circuit operates in the first state, and the clock signal generation circuit generates a clock signal based on the first temperature compensation signal. When the output circuit operates in the second state, the temperature compensation circuit outputs a second temperature compensation signal that compensates for a frequency-temperature characteristic when the output circuit operates in the second state, and the clock signal generation circuit generates a clock signal based on the second temperature compensation signal.