Oscillator Circuit Layout for Temperature Sensor Noise Isolation
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Solution Overview
Problem
In circuit devices with temperature compensated oscillation circuits, the intermittent operation of temperature sensor circuits can cause AC fluctuations in current consumption, leading to noise interference and deterioration of signal characteristics, especially when close to oscillation circuits.
Innovation Solution
The logic circuit or power supply circuit is disposed between the oscillation circuit and the temperature sensor circuit to increase the distance and reduce noise interference, with the temperature sensor circuit performing intermittent operations to minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor circuit is disposed near the oscillation circuit to measure temperature accurately, then the temperature measurement precision is improved, but the signal characteristics of the oscillation signal deteriorate due to noise from AC current fluctuations
Solution Approach 1:
A ground circuit is introduced as an intermediary between the temperature sensor circuit and the oscillation circuit. The ground circuit provides a dedicated return path for the AC current fluctuations generated by the intermittent operation of the temperature sensor, preventing these fluctuations from coupling into the oscillation circuit and degrading the oscillation signal characteristics.
Solution Approach 2:
The circuit layout is segmented into distinct functional zones: the temperature sensor circuit is disposed near the oscillation circuit for accurate temperature measurement, but the ground circuit creates an electrical separation that isolates the noise pathways. This segmentation allows both close physical proximity for thermal coupling and electrical isolation for noise prevention.
2Use of energy by moving object
If the temperature sensor circuit performs intermittent operation to reduce power consumption, then the energy consumption is reduced, but AC fluctuations in current consumption generate noise that interferes with the oscillation circuit
Solution Approach 1:
The AC current fluctuations generated by the intermittent operation of the temperature sensor circuit, which would normally be harmful noise, are redirected through the dedicated ground circuit. By providing a low-impedance return path for these fluctuations, the ground circuit converts the harmful AC noise into a controlled current path that does not interfere with the oscillation circuit, allowing the temperature sensor to operate intermittently for low power consumption.
3Manufacturing precision
If the temperature sensor circuit is disposed close to the oscillation circuit, then the temperature compensation accuracy is improved, but the oscillation signal characteristics deteriorate due to noise from intermittent operation
Solution Approach 1:
The ground circuit acts as an intermediary that enables both close proximity disposal of the temperature sensor circuit (for accurate temperature compensation) and isolation of the noise pathways. The ground circuit provides a dedicated return path that prevents AC current fluctuations from the temperature sensor from coupling into the oscillation circuit, thereby maintaining oscillation signal characteristics while achieving accurate temperature compensation.
Data Source
AI summary
A circuit device includes an oscillation circuit generating an oscillation signal by oscillating a vibrator, a temperature sensor circuit performing an intermittent operation, a logic circuit performing temperature compensation processing based on an output of the temperature sensor circuit, and a power supply circuit supplying power to the oscillation circuit. Further, the logic circuit or the power supply circuit is disposed between the oscillation circuit and the temperature sensor circuit.