High-flatness Broadband Comb Spectrum Generator Based on PLL Mechanism

Abstract

The invention discloses a high-flatness broadband comb spectrum generator based on a phase-locked loop mechanism, which consists of an R frequency divider, a phase detector PD, a loop filter LP, a voltage-controlled oscillator VCO, and an N frequency divider , Band-pass filter, the reference signal input is divided by the R frequency divider into the phase detector input, the output of the R frequency divider is the comb spectrum interval frequency through program control, and the loop frequency fed back by the N frequency divider It is also set as the comb spectrum interval frequency. When the phase-locked loop is locked stably, part of the output of the N frequency divider is drawn out to obtain the comb spectrum signal, and then the unwanted signal outside the bandwidth is suppressed by the band-pass filter to obtain the final output. comb signal. Compared with traditional comb spectrum generators, this technology has the characteristics of high flatness, fine and adjustable spacing, wide band, and adjustable zero point of comb spectrum.

Description

technical field [0001] The invention relates to the field of comb spectrum generators, in particular to a high-flatness broadband comb spectrum generator based on a phase-locked loop mechanism. Background technique [0002] A comb spectrum generator is a modular component capable of generating comb spectrum signals, and is widely used in the field of modern communication systems. In multi-channel receivers, calibration sources are often used to calibrate the receiver to eliminate phase or amplitude errors between channels. If the conventional phase-locked loop method is used, only a single frequency point signal can be output each time and then scanned, but this will make the correction time very long, which affects the real-time requirements of the receiver. In order to shorten the calibration time and provide the real-time requirements of the receiver, it is very important to use a comb spectrum generator. In the application scenario of amplitude error calibration, it is...

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Problems solved by technology

[0004] Nowadays, with the rapid development of the communication industry, the performance requirements of the receiver are getting higher and higher, the required bandwidth is getting wider and the channel spacing is getting finer and finer, and the traditional analog comb generator based on diodes is difficult to meet the current high requirements. Requirements for flatness, broadband output, and fine pitch

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