Low-noise broadband frequency-hopping synthesizer

A frequency synthesizer, broadband frequency hopping technology, applied in the direction of automatic power control, electrical components, etc., can solve the problem of insufficiency of noise deterioration, and achieve the effect of low cost, fast frequency hopping speed and wide frequency range

CN102013890AInactive Publication Date: 2011-04-13上海杰盛无线通讯设备有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-04-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a low-noise broadband frequency-hopping synthesizer, which adopts an interpolating frequency-mixing phase lock loop to reduce a frequency dividing ratio. The interpolating frequency-mixing phase lock loop divides reference source signals into two paths by a power divider to be respectively provided for a phase detection discriminator A and a phase detection discriminator B; the phase detection discriminator B, a low pass filter N, a voltage-controlled oscillator Q and a frequency divider constitute an interpolating local oscillator PLL; the interpolating local oscillator PLL provides point-frequency local-oscillation signals to perform down-conversion with the output of the frequency synthesizer; and the down-conversion performs output feedback to reduce the frequency dividing ratio and phase noise through the phase detection discriminator A. The low-noise broadband frequency-hopping synthesizer has the advantages of low noise, wide frequency range, high frequency-hopping speed, simple debugging and low cost.
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Description

technical field

[0001] The invention relates to a frequency synthesizer in a wireless communication system, and is especially suitable for a low-noise broadband frequency-hopping frequency synthesizer in microwave high-speed frequency-hopping communication. Background technique

[0002] Frequency synthesizers are widely used in communication, remote sensing, national defense and other fields. With the further development of technology, the requirements for the frequency hopping speed and frequency hopping bandwidth of the frequency synthesizer are getting higher and higher. While meeting the requirements of frequency hopping speed and frequency hopping bandwidth, it is difficult to take into account the phase noise of the frequency synthesizer at the same time.

[0003] In order to achieve 1GHz frequency hopping bandwidth, 10MHz frequency hopping interval, and to meet fast frequency hopping at the same time, the loop bandwidth needs to be made relatively wide. Therefore, a ...

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Embodiment Construction

[0019] Please refer to the accompanying drawings for a further description of the present invention.

[0020] like figure 2 As mentioned above, the present invention provides a low-noise broadband frequency hopping frequency synthesizer, which uses an interpolation mixing phase-locked loop to reduce the frequency division ratio.

[0021] Described interpolation frequency mixing phase-locked loop, is that reference source 1 signal is divided into two-way through power divider 2, provides respectively to frequency discrimination phase detector A3 and frequency discrimination phase detector B8, frequency discrimination phase detector B8 and The low-pass filter N9, the voltage-controlled oscillator Q10 and the frequency divider 11 form an interpolated local oscillator PLL, which provides a point-frequency local oscillator signal, which is down-converted with the output of the frequency synthesizer, and the down-converted output is fed back through The frequency and phase detecto...