Temperature-Compensated Oscillating Circuit for Stable Frequency
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Solution Overview
Problem
Electronic oscillators experience unstable oscillating frequencies due to variations in internal resistance caused by temperature changes, lacking effective temperature compensation mechanisms.
Innovation Solution
The oscillating circuit incorporates a NAND gate, first and second inverters, and an RC delay circuit with specific resistors and capacitors having temperature coefficient characteristics to stabilize output signals by compensating for temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature compensation mechanism is added to oscillating circuit, then frequency stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the temperature compensation function with the existing oscillating circuit by integrating a compensation capacitor and resistor directly into the oscillation path. The compensation capacitor is connected in parallel with the oscillating resistor, combining frequency determination and temperature compensation functions in a single circuit block, thereby improving frequency stability without proportionally increasing overall circuit complexity.
Solution Approach 2:
The patent utilizes parameter changes of electronic components with respect to temperature. Specifically, it employs a compensation capacitor whose capacitance varies with temperature to counteract the temperature-induced changes in the oscillating resistor's resistance. By selecting components with appropriate temperature coefficients, the circuit automatically adjusts its parameters to maintain stable oscillation frequency across temperature variations.
2Manufacturing precision
If temperature compensation components are integrated into oscillating circuit, then output signal stability is improved, but manufacturing complexity increases
Solution Approach 1:
The oscillating resistor serves dual functions: determining the oscillation frequency and providing temperature compensation when paired with the compensation capacitor. This multi-functionality reduces the need for separate compensation components, simplifying the manufacturing process while maintaining output signal stability across temperature ranges.
Solution Approach 2:
The patent relies on the inherent parameter changes of standard electronic components (resistor and capacitor) with temperature rather than requiring custom temperature-compensated components. This approach uses off-the-shelf parts with known temperature characteristics, making the circuit easier to manufacture while achieving the desired output stability.
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 circuit maintains a stable output oscillating frequency by balancing negative and positive temperature coefficient resistances, ensuring the final output signal is not affected by temperature fluctuations.
Implementation Method 1
each of a plurality of first internal elements included by the first inverter has a negative temperature coefficient resistive characteristic
Implementation Method 2
the oscillating resistor has a positive temperature coefficient resistive characteristic
Data Source
AI summary
The present disclosure discloses an oscillating circuit having a temperature compensation mechanism. A NAND gate receives an input signal transiting from a low state level to a maintaining high state to initialize an oscillating behavior and a delayed control signal to generate an output oscillating signal. A first inverter having a negative temperature coefficient resistance inverts the output oscillating signal to generate an inverted output oscillating signal to be received and delayed by a RC delay circuit, including an oscillating resistor having a positive temperature coefficient resistance and an oscillating capacitor to generate a delayed and inverted control signal. A second inverter inverts the delayed and inverted control signal to generate a delayed control signal. A third inverter inverts the output oscillating signal to generate a final oscillating signal. The negative temperature coefficient resistance and the positive temperature coefficient resistance together determine an oscillating circuit temperature coefficient.