Triangle Wave Generator With Spread Spectrum and Linear Slopes
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Solution Overview
Problem
Existing spread spectrum methods for clock signals introduce nonlinear distortion when applied to triangle wave signals, causing undesirable changes in the slope's linearity, which is not suitable for applications requiring undistorted triangle waveforms.
Innovation Solution
A triangle wave generator circuit comprising a switch control circuit, current generator, and spread spectrum control circuit that alternately controls switches to maintain linearity while achieving spread spectrum functionality, supporting both master and slave modes with an external clock synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If spread spectrum methods are applied to triangle wave signals, then frequency distribution over spectrum is improved, but waveform linearity deteriorates
Solution Approach 1:
The triangle wave generation is segmented into discrete charge and discharge phases controlled by switches. The spread spectrum frequency variation is applied only to the duration of these phases rather than continuously distorting the waveform, thereby maintaining linearity while achieving frequency distribution.
Solution Approach 2:
The patent uses periodic switching control where switches alternately connect current sources to the integrator capacitor for charge and discharge cycles. This periodic action creates the triangle wave while allowing frequency modulation through variable timing without introducing continuous distortion.
2Adaptability or versatility
If continuous frequency disturbance is applied to achieve spread spectrum, then frequency distribution is improved, but waveform distortion increases
Solution Approach 1:
The patent dynamically adjusts the duration of charge and discharge phases to achieve frequency variation. By making the timing dynamic rather than continuously disturbing the frequency, the system achieves spread spectrum capability while maintaining clean triangular waveforms without distortion.
3Adaptability or versatility
If slave mode synchronization with external clock is added, then adaptability is improved, but device complexity increases
Solution Approach 1:
The switch control circuit is designed to operate in multiple modes: master mode where it generates its own clock, and slave mode where it synchronizes to an external clock. This multi-functionality allows the same circuit structure to provide both independent operation and synchronized operation, increasing adaptability without proportionally increasing complexity.
Data Source
AI summary
A triangle wave generator with function of spreading frequency spectrum is provided. The triangle wave generator includes a switch control circuit, a current generator, an integrator, and a spread spectrum control circuit. The switch control circuit provides an internal clock and a switch control signal. The current generator is coupled to the switch control circuit and provides charge current according to the switch control signal. The integrator is coupled to the current generator and provides a triangle wave signal. The spread spectrum control circuit is coupled to the switch control circuit and the current generator for providing a current control signal according to the internal clock.