Triangular Wave Generator Using RC Feedback to Cut Circuit Complexity
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Solution Overview
Problem
Triangular wave generators are complex due to the numerous elements and control signals required, leading to increased chip size and complexity.
Innovation Solution
A simplified triangular wave generator design incorporating a square wave signal generating unit, a resistance unit, and a capacitance unit, which adjusts voltage levels and generates triangular waves through charging and discharging, reducing the number of components and control signals needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional triangular wave generator elements (current sources, comparators, switches, flip-flops) are used, then triangular wave generation function is achieved, but device complexity and chip size increase
Solution Approach 1:
The patent extracts and eliminates unnecessary control elements (current sources, comparators, switches, flip-flops) from the traditional triangular wave generator, retaining only the essential components (integrator with capacitor and resistor) needed to generate triangular waves, thereby reducing device complexity while maintaining functionality
Solution Approach 2:
The simplified circuit uses the inherent properties of the integrator and feedback mechanism to automatically generate triangular waves without requiring external control signals or additional control logic elements, making the system self-sufficient and reducing overall complexity
2Device complexity
If many control signals are used to control current sources and comparators, then triangular wave generation is achieved, but device complexity increases
Solution Approach 1:
The patent removes the need for multiple control signals by eliminating the control elements (current sources, comparators, switches) that required such signals, leaving only the passive integrator components that operate without active control
Solution Approach 2:
The circuit generates triangular waves through the natural charging and discharging behavior of the capacitor in the integrator, driven by the feedback mechanism, without requiring any external control signals to regulate current or voltage levels
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 design minimizes chip size and complexity while maintaining the ability to generate triangular waves with various duty ratios, making it suitable for integration and applications like motor driving circuits and frequency synthesizers.
Implementation Method 1
a capacitance unit configured to receive an output signal of the resistance unit to generate a second signal rising to a high level from a low level with a slope, to provide the reset signal generated from the second signal to the square wave signal generating unit, and to output a triangular signal by falling the second signal to a low level from a high level with a slope
Data Source
AI summary
Disclosed is a triangular wave generator which includes a square wave signal generating unit configured to output a first signal transitioning to a high level from a low level via an output terminal in response to a first transition of a clock signal and to transition the first signal to a low level from a high level in response to a reset signal; a resistance unit configured to adjust a voltage level of a the square wave signal; and a capacitance unit configured to receive an output signal of the resistance unit to generate a second signal rising to a high level from a low level with a slope, to provide the reset signal to the square wave signal generating unit, and to output a triangular signal by falling the second signal to a low level from a high level with a slope.