broadband signal generator

Abstract

A broadband signal generator, comprising: a switch network, an integer frequency division local oscillator ring and a fractional frequency division mixing ring, wherein: the integer frequency division local oscillator ring includes a voltage-controlled oscillator, and the voltage-controlled oscillator is selected by the switch network any VCO in the first / second VCO array; the fractional frequency mixing loop includes another VCO which is the first VCO gated by the switch network Two / any voltage-controlled oscillator in the first voltage-controlled oscillator array; wherein, the first / second voltage-controlled oscillator includes n narrow-band voltage-controlled oscillators with different frequency bands. Since the broadband signal generator of the present invention adopts a voltage-controlled oscillator array composed of a plurality of narrow-band voltage-controlled oscillators with different frequency bands, the voltage-controlled oscillators connected to the local oscillator ring and the frequency mixing ring are regulated through the switch network, and the wide-band frequency can be realized. Compared with the existing broadband voltage-controlled oscillator scheme, it has the advantage of low far-end phase noise, and its far-end phase noise can be as low as -125dBc / Hz@1MHz.

Description

technical field [0001] The invention belongs to the field of test and measurement, and more specifically relates to a broadband signal generator. Background technique [0002] The existing signal generator adopts integer frequency-division phase-locked loop and / or fractional frequency-division phase-locked loop, and is composed of a main circuit formed by a phase detector, a filter and a voltage-controlled oscillator, and a feedback formed by a frequency divider, wherein The voltage-controlled oscillator is a narrow-band structure, which is difficult to be applied to the fields requiring wide frequency bands such as test and measurement. [0003] In order to realize broadband, a broadband voltage-controlled oscillator can be used, but the remote phase noise of the broadband voltage-controlled oscillator is relatively poor, and it is difficult to meet the requirements of test and measurement. Contents of the invention [0004] Based on the above problems, the main purpose ...

AI Technical Summary

Problems solved by technology

[0002] The existing signal generator adopts integer frequency division phase-locked loop and / or fractional frequency division phase-locked loop, and is composed of a main circuit formed by a phase detector, a filter and a voltage-controlled oscillator, and a feedback formed by a frequency divider, wherein The voltage-controlled oscillator has a narrow-band structure, which is difficult to apply to fields requiring wide frequency bands such as test and measurement.

[0003] In order to achieve broadband, a broadband voltage-controlled oscillator can be used, but the remote phase noise of the broadband voltage-controlled oscillator is poor, and it is difficult to meet the needs of test and measurement

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