PWM Signal Circuit With Negative Feedback for Stable Wave Shaping
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Solution Overview
Problem
Conventional regulation and shaping circuits for generating low frequency signals in satellite communication systems face challenges such as increased chip area, circuit consumption, and frequency limitations, which can lead to signal distortion and frequency shifts, especially when integrating push-pull output circuits and lacking negative feedback control.
Innovation Solution
A regulation and shaping circuit that employs a negative feedback control loop and a de-coupling element, using a differential amplifier and a push-pull output stage with MOS transistors to stabilize and control the output voltage signal, allowing for precise control of frequency, duty-cycle, and wave shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If push-pull output circuits are integrated to maintain wave shape, then signal quality is improved, but chip area and power consumption increase
Solution Approach 1:
The patent extracts the frequency control function from the output stage and places it in a separate frequency control circuit. This allows the push-pull output stage to be simplified or removed, reducing chip area and power consumption while maintaining signal quality through the dedicated frequency control mechanism.
Solution Approach 2:
The circuit is segmented into distinct functional blocks: a frequency control circuit separate from the output stage, with clear division of responsibilities. This segmentation allows optimization of each block independently, reducing overall complexity and resource usage while maintaining performance.
2Productivity
If conventional circuits operate at high frequencies, then productivity is improved, but signal distortion and frequency shifts occur
Solution Approach 1:
The patent implements negative feedback control where the frequency control circuit receives feedback about the actual output frequency and adjusts its control signals accordingly. This feedback mechanism compensates for frequency drift and distortion that occur at high operating frequencies, maintaining signal stability.
3Manufacturing precision
If regulation circuits are added to control output parameters, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The frequency control circuit is designed to perform multiple functions: frequency regulation, duty cycle control, and amplitude stabilization. By making this single circuit multi-functional, the patent achieves precise output parameter control without proportionally increasing overall circuit complexity.
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
This solution enables stable and precise generation of low frequency signals with controlled frequency, duty-cycle, and rising/falling times, preventing signal distortion and frequency shifts, while maintaining a compact and efficient semiconductor chip design.
Implementation Method 1
The regulation and shaping circuit comprises a differential amplifier having a relatively high gain
Implementation Method 2
push-pull output stage with MOS transistors to stabilize and control the output voltage signal
Implementation Method 3
employs a negative feedback control loop and a de-coupling element, using a differential amplifier and a push-pull output stage with MOS transistors to stabilize and control the output voltage signal
Data Source
AI summary
An embodiment of regulation and shaping circuit includes a first input terminal for receiving a first input signal with a first frequency; a second input terminal for receiving a second input signal with a second frequency higher than the first frequency; a first circuital branch coupled to the first input terminal and, through first coupling means active at the first frequency, to an output terminal for providing an output signal; a second circuital branch coupled to the second input terminal and to the output terminal, wherein said second circuital branch comprises a negative feedback circuital loop adapted to control the output signal according to the second input signal.