High-performance broadband frequency source generation circuit employing multi-harmonic reference, and generation method

A technology for generating circuits and frequency sources. It is applied in the direction of electrical components and automatic power control. It can solve problems such as difficult removal and large signal spurs, so as to improve performance, reduce signal spurs, and achieve good economic benefits and application prospects. Effect

Inactive Publication Date: 2015-08-12
NANJING PANDA ELECTRONICS +1
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Problems solved by technology

However, an important feature of the signal generated by fractional frequency division technology is that the spurs are large.
Moreover, the spurs are generally in the narrowband range, which is difficult to remove

Method used

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  • High-performance broadband frequency source generation circuit employing multi-harmonic reference, and generation method
  • High-performance broadband frequency source generation circuit employing multi-harmonic reference, and generation method
  • High-performance broadband frequency source generation circuit employing multi-harmonic reference, and generation method

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Embodiment Construction

[0027] The following structural drawings further illustrate the present invention.

[0028] This embodiment is a 2-16 GHz broadband frequency source, which is mainly composed of a multi-harmonic reference generation part, a core phase-locked loop, frequency multiplication and division, and segmental filtering parts. The multi-harmonic reference generation part mainly generates two frequency points, which can be divided into frequency in the phase-locked loop chip as the reference signal of the phase-locked loop. The phase-locked loop mainly uses a fractional frequency division chip and a broadband VCO to realize the broadband function. By changing the selection of the reference frequency and selecting different frequency division ratios of the numerical control frequency divider and the selection of the direct frequency division ratio of the VCO, the high spurious frequency point is reasonably avoided to achieve the design goal of low spurious and wide frequency band.

[0029...

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Abstract

According to the invention, a microwave frequency source mainly consists of a multi-harmonic reference generation part, a core phase-locked loop, and a frequency-multiplication frequency-demultiplication and segmented filtering part. The multi-harmonic reference generation part mainly generates two frequency points, and digital control frequency demultiplication can be carried out in the core phase-locked loop, so as to serve as a reference signal of the core phase-locked loop. The core phase-locked loop mainly employs a fractional frequency division chip and broadband VCO, thereby achieving a broadband function. High-stray frequency points are avoided reasonably through the change of the selection of a reference frequency, thereby achieving the low-stray and broadband design target.

Description

technical field [0001] The invention belongs to a frequency source generating circuit, in particular to a multi-harmonic reference, wide-band, low-spur microwave frequency source generating circuit and a generating method thereof. Background technique [0002] Frequency source is an important part of electronic equipment such as radio monitoring system, radar system and microwave measurement, and its performance directly determines the quality of electronic equipment. The receiver is one of the core components of the radio monitoring system. As the local oscillator of the receiver, the frequency source is mixed with the signal. Its performance directly affects the quality of the wireless received signal. The main performance is: reducing the phase noise of the frequency source can improve the receiver Excellent signal-to-noise ratio and sensitivity; reducing the spurious frequency source can reduce interference in a single channel and between different channels; increasing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/18
Inventor 姚兴强李跃进
Owner NANJING PANDA ELECTRONICS
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