Digital ultra wide band comb-shaped spectrum signal generator

Abstract

The invention discloses a digital ultra wide band comb-shaped spectrum signal generator which comprises an amplitude limiter, a comparator logic converter, a differentiator, a wide band switch, a high-pass filter, a switch drive circuit and a power module. The signal output end of the high-pass filter serves as the digital ultra wide band comb-shaped spectrum signal output end. Double-way amplitude limitation is conducted through the amplitude limiter and a device is prevented from being burned out by influence of strong signals; input signals of a comparator are compared with zero, so that square wave clock signals are generated; the square wave clock signals are combined with the high level through the logic converter and then are output, the rising edge or the falling edge of square waves is improved; the rising edge or the falling edge is charged or discharged through the differentiator, so that narrow pulses are generated; then the pulses pass through the wide band switch, time domains are multiplied, required pulses are output after modulation, and the interval of spectral lines is controlled; finally, the high-pass filter is used for high-pass filtering and low-frequency rejection; meanwhile, a modulation period is sampled through the switch drive circuit, so that a comb-shaped spectrum with the ultra wide band, the adjustable spectral lines and the stable waveform is obtained.

Description

technical field [0001] The invention relates to the technical field of comb spectrum generator research, in particular to a digital ultra-wideband comb spectrum signal generator. Background technique [0002] At present, the comb spectrum signal generation method mainly uses the high-order harmonic generation of microwave diodes. The principle is to use the energy storage element to charge and discharge to obtain a short-duration signal, and then through the pulse shaping network to shape the pulse waveform that meets the requirements. Such devices include tunnel diodes, step recovery diodes, avalanche transistors, capture diodes and pulse discharge tubes, etc., which are mainly used in signal calibration and electromagnetic compatibility testing. Among them, the microwave diode uses its special energy band structure to generate tunnel current, which can make the pulse amplitude of hundreds of millivolts, and the rising edge can reach tens of picoseconds. The step tube uses...

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Problems solved by technology

At present, due to the existence of discharge tailing phenomenon in these circuits, the generated pulse waveform is unstable, the interval of spectral lines cannot be adjusted, and the limited bandwidth of high-order harmonics cannot achieve the required width.

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