Fast agile broadband frequency synthesizer

Abstract

The invention discloses a broadband frequency synthesizer capable of realizing quick agility. The method is applied to a local oscillator or a radio frequency excitation signal of wireless superheterodyne communication equipment. Quick frequency conversion of the frequency synthesizer is completed by alternate work of the first integrated phase-locked loop and the second integrated phase-locked loop. The frequency locking process of each integrated phase-locked loop is completed in advance, so that the frequency changing time of the system is determined by the switching time of the first radiofrequency switch and the frequency changing time of the microstrip filter, the switching time of the first radio frequency switch is less than 1 microsecond, the frequency changing time of the microstrip filter is less than 10 microseconds, and the frequency changing time of the frequency synthesizer can be within 10 microseconds. In combination with a third integrated phase-locked loop, the output frequency range of the system is 30 MHz to 7 GHz, the frequency range is wide, the frequency changing time is shorter than 10 microseconds, the conversion time is short, and the application requirement of a wide-frequency-band high-speed frequency hopping system can be met.

Description

technical field [0001] The invention belongs to the technical field of communication systems, and in particular relates to a fast and agile broadband frequency synthesizer, which is applied to local oscillator or radio frequency excitation signals of wireless superheterodyne communication equipment. Background technique [0002] Frequency synthesizer is the core component of electronic equipment and communication system, and is the key equipment or component that determines the performance of the system. So far, there have been three frequency synthesis techniques, which are direct synthesis (DS), phase-locked synthesis (PLL) and direct digital synthesis (DDS). The DS frequency synthesizer is large in size and high in cost, and the number of output spurious frequencies is large and restrictive. PLL has the characteristics of high output frequency, wide frequency bandwidth, and good spurious performance, but because the reference frequency that determines its output resoluti...

AI Technical Summary

Problems solved by technology

The current frequency synthesis technology still has the problem of long frequency switching time. To shorten the frequency switching time will cause noise performance degradation. At the same time, the frequency range is not wide enough to meet the wide-band local oscillator or RF output requirements.

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