Low-Speed Oscillator Circuit With Capacitor Divider Overvoltage Limiting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic devices with oscillators face challenges in maintaining stable oscillation frequencies over a wide temperature range and minimizing device breakdown, particularly in transistors within digital inverters.
Innovation Solution
A low-speed oscillator circuit is designed with a capacitor divider and an enable delay switch to limit the voltage at the first node to a range between the supply voltage and ground, reducing overvoltage and preventing device breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an oscillator circuit operates over a wide temperature range, then the operational versatility is improved, but the device breakdown risk increases due to unstable oscillation frequency
Solution Approach 1:
A capacitor divider is introduced as an intermediary component between the oscillation circuit and the inverter input. This capacitor divider mediates the voltage signal, ensuring that the inverter receives a controlled voltage within safe limits regardless of temperature-induced oscillation frequency changes, thus preventing device breakdown while maintaining wide temperature range operation
Solution Approach 2:
The circuit utilizes temperature-dependent parameter changes in the oscillator components to naturally adjust the oscillation frequency across temperature ranges. By designing the oscillator with components whose parameters change predictably with temperature, the circuit maintains stable operation without causing overvoltage conditions that would lead to device breakdown
2Reliability
If the oscillation frequency is stabilized over temperature, then the reliability is improved, but the circuit complexity increases due to additional voltage limiting components
Solution Approach 1:
The capacitor divider serves multiple functions simultaneously: it limits the voltage to prevent device breakdown, it provides signal coupling between stages, and it helps stabilize the oscillation frequency over temperature. By making this single component multi-functional, the circuit achieves reliable temperature-stable operation without proportionally increasing complexity
Solution Approach 2:
The oscillator circuit is designed to self-regulate its voltage levels through the inherent properties of the capacitor divider and the inverter's input characteristics. The circuit automatically adapts to temperature changes without requiring external control mechanisms, maintaining stable frequency while keeping the overall structure relatively simple
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 effectively reduces or eliminates overvoltage in the oscillator circuit, thereby minimizing device breakdown and ensuring stable oscillation frequencies across varying temperatures.
Implementation Method 1
a first capacitor that is electrically connected to the third node and a sixth node that is electrically connected to the fifth node, and a second capacitor that is electrically connected to the sixth node and a ground. The first capacitor and the second capacitor form a capacitor divider, and the capacitor divider limits a first voltage at the first node to a voltage range between the supply voltage and the ground
Data Source
AI summary
Oscillator circuits, electronic devices, and methods are disclosed. In one embodiment, an oscillator circuit includes a first inverter, a second inverter, a third inverter, a resistor, an enable transistor with a gate of the enable transistor is configured to receive a first enable signal, a first capacitor, and a second capacitor that forms a capacitor divider with the first capacitor. The capacitor divider limits a first voltage at the first inverter to a voltage range between the supply voltage and the ground.