MOS Oscillation Circuit for Stable Frequency at Low Current
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Solution Overview
Problem
Conventional oscillation circuits require large circuit scales and high current consumption to maintain constant frequency output, which is affected by power supply voltage and temperature fluctuations.
Innovation Solution
The oscillation circuit employs NMOS transistors and switch circuits to maintain constant voltage and constant current circuits for charging and discharging a capacitor, allowing for a compact design with reduced current consumption while maintaining constant frequency output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a BGR circuit and constant current bias generation circuit are used to maintain constant frequency, then the frequency stability is improved, but the circuit scale and current consumption increase
Solution Approach 1:
The patent extracts and eliminates the BGR circuit and constant current bias generation circuit from the oscillation circuit, keeping only the essential components (capacitor, inverter, and switching transistor) needed for frequency generation. This extraction maintains frequency stability while significantly reducing circuit scale and current consumption.
Solution Approach 2:
The oscillation circuit is designed to self-regulate its frequency output using the inherent characteristics of the capacitor and inverter combination, without requiring external bias generation circuits. The circuit uses its own output signal to control the switching transistor, creating a self-sustaining oscillation that is immune to power supply and temperature variations.
2Reliability
If a BGR circuit and constant current bias generation circuit are used to maintain constant frequency, then the frequency stability is improved, but the current consumption increases
Solution Approach 1:
The patent removes the power-hungry BGR circuit and constant current bias generation circuit from the design, retaining only the minimal components necessary for frequency generation. This extraction dramatically reduces current consumption while preserving frequency stability through the capacitor-inverter-switching transistor mechanism.
Solution Approach 2:
The circuit operates autonomously using the output signal to directly control the switching transistor, eliminating the need for separate bias generation circuits that consume additional current. The self-regulating mechanism maintains stable frequency with minimal power consumption.
3Use of energy by moving object
If the circuit scale is reduced to lower current consumption, then the energy efficiency is improved, but the frequency stability may deteriorate
Solution Approach 1:
The patent implements a self-regulating oscillation mechanism where the output signal automatically controls the switching transistor timing, creating inherent frequency stability without requiring complex bias circuits. This self-service approach maintains frequency stability while minimizing current consumption through component reduction.
Solution Approach 2:
The patent changes the operating parameters by eliminating the BGR circuit's voltage regulation function and instead using the capacitor voltage thresholds and inverter switching characteristics to define the oscillation frequency. This parameter change enables stable frequency generation with a simplified, lower-power circuit architecture.
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 enables a small-scale oscillation circuit with low current consumption that outputs a constant frequency unaffected by power supply voltage and temperature fluctuations.
Implementation Method 1
a capacitor C1, inverters 41, 42, and 44
Implementation Method 2
a PMOS transistor M1, and an NMOS transistor M2
Data Source
AI summary
An oscillation circuit includes first and second constant current circuits, first and second switch circuits, first and second MOS transistors, and an output port. The first constant current circuit is connected to one port of a capacitor. The first MOS transistor has a gate and a drain connected to the second constant current circuit and a source connected to another port of the capacitor. The second MOS transistor has a gate connected to the gate of the first MOS transistor, and a drain connected to the one port of the capacitor. The second switch circuit is connected between a source of the second MOS transistor and a second power supply terminal. The output port outputs a signal based on a voltage of the one port. Turn-on and turn-off of the first and second switch circuits are controlled by the signal of the output port and an inverted signal.