Triangular Wave Circuit Correction for Distortion-Free FM-CW Radar
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Solution Overview
Problem
Conventional triangular wave generation circuits for FM-CW radar systems suffer from waveform distortion due to variations in power supply voltage and temperature characteristics, leading to errors in target detection and unstable frequency and size of the waveform, which cannot be resolved by simple circuit modifications.
Innovation Solution
A triangular wave generation circuit that includes a rectangular wave generation circuit, an integration circuit, and a triangular wave correcting circuit to correct waveform distortion by adjusting the differential voltage between the starting and ending points of the direct current interval of the intermittent triangular wave signal, ensuring the signal level of the direct current interval matches the reference voltage, thereby preventing waveform distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the reference signal is generated by resistance dividing the power supply voltage in the conventional integration circuit, then the circuit design is simple, but the output signal drifts and waveform distortion occurs due to power supply voltage variation and level differences
Solution Approach 1:
The patent changes the reference signal generation method from simple resistance division to using an operational amplifier that outputs a signal with the same level as the direct current interval of the intermittent rectangular wave signal. This parameter change in the reference signal generation approach eliminates waveform distortion and output drift while maintaining circuit simplicity.
2Device complexity
If no correction is applied to the integration circuit output, then the circuit structure remains simple, but waveform distortion occurs due to level differences between reference signal and direct current interval
Solution Approach 1:
The patent adjusts the output level parameter of the operational amplifier generating the reference signal to match the direct current interval level. This parameter adjustment eliminates the need for additional correction circuits while achieving accurate waveform generation without distortion.
3Ease of manufacture
If the conventional integration circuit is used without level matching, then the circuit design is straightforward, but the frequency and size of waveform distortion become irregular due to temperature characteristics
Solution Approach 1:
The patent changes the reference signal generation approach to use an operational amplifier configured to output a signal matching the direct current interval level. This parameter change ensures stable waveform generation across temperature variations without requiring complex temperature compensation circuits.
Data Source
AI summary
An accurate intermittent triangular wave signal without waveform distortion is generated by a triangular wave generation circuit 1 including a rectangular wave generation circuit 111 for generating an intermittent rectangular wave signal in which a rectangular wave interval and a direct current interval of a predetermined level are repeated; an integration circuit 12 for generating an intermittent triangular wave signal in which a triangular wave interval and a direct current interval are repeated based on a reference signal and the intermittent rectangular wave signal generated by the rectangular wave generation circuit 111; and a triangular wave correcting circuit 112 for correcting waveform distortion of the intermittent triangular wave signal based on a differential voltage between a starting point and an ending point of the direct current interval of the intermittent triangular wave signal output from the integration circuit 12.