Reconfigurable composite waveform generation circuit

Abstract

The invention provides a reconfigurable composite waveform generation circuit. The reconfigurable composite waveform generation circuit comprises a constant-current charging module, a threshold setting module and a logic judgment module, in two branches of the constant-current charging module, one branch generates an output waveform signal, and the other branch controls the duration of a direct-current level; the threshold value setting module compares the input waveform signal voltage value, the direct current level and the preset threshold value of each key node, and outputs a mark signal to the input end of the logic judgment module; and the logic judgment module performs logic judgment according to a mark signal input by the threshold setting module, and outputs a switch control signal to be fed back to the two charging branches in the constant-current charging module. The analog circuit, the threshold setting module and the simple logic control unit are combined, output of direct-current level, sawtooth wave and direct-current and sawtooth wave time division multiplexing waveforms is achieved, hardware cost is low, software configuration is not needed, simple and continuous adjustment can be achieved, and flexibility is high.

Description

technical field [0001] The invention relates to the technical field of control circuits, in particular to a reconfigurable composite waveform generating circuit. Background technique [0002] Different radar operating modes require different voltage control waveforms. like figure 1 As shown, since the output frequency f of the VCO is linear with the control voltage Vc, different control waveforms can produce different frequency modulation effects. For Dopper mode, the VCO control waveform requires a stable DC level signal; for FMCW mode, the VCO control waveform requires a sawtooth signal; for composite mode, the VCO control waveform requires a sawtooth and DC level signal time-division multiplexed signal. In addition, in order to increase the practicability and universality of the circuit, parameters such as the frequency, amplitude, and waveform interval of the control waveform should also be flexible and adjustable. [0003] Waveform generation circuits are critical t...

AI Technical Summary

Problems solved by technology

like figure 2 As shown, it is a direct digital frequency synthesis system, but the composite waveform generation technology based on DDS has the following disadvantages: 1. The hardware cost is high

2. Need software configuration

3. Inconvenient adjustment

4. Rich signal spurs

There are many spurious signals in the waveform output by the digital signal driving digital-to-analog conversion chip

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