Novel help lock circuit in broadband phase-locked loop

Abstract

The invention provides a novel help lock circuit in a broadband phase-locked loop. The novel help lock circuit in the broadband phase-locked loop comprises a digital voltage reference, a digital potentiometer, a digital emitter follower and am adder, wherein the digital voltage reference generates a standard low-hybrid wave voltage, is a high performance low-noise voltage reference, and has the characteristics of single-chip integration, high stability and high frequency accuracy, the digital potentiometer converts the standard low-hybrid wave voltage into a help lock voltage needed by locking, the digital emitter follower magnifies and isolates the help lock voltage, and the adder adds the voltage which is output from the digital emitter follower and the voltage which is output through a loop operational amplifier in a broadband phase-locked loop system. The novel help lock circuit in the broadband phase-locked loop reduces complexity level of circuits, enables the circuits to easily achieve miniaturization, solves the problem that traditional help lock circuits are not easy to integrate, greatly reduces size of the circuits by adopting printed circuit board (PCB) process to produce and assemble all parts and circuits, has the characteristics of small volume, steady performance and high consilience of indicators, and solves the problem of digital noise of traditional help lock circuits.

Description

technical field [0001] The invention relates to the technical field of microwave communication electronic devices, in particular to a novel lock-assisting circuit in a broadband phase-locked loop. Background technique [0002] The frequency source is one of the core components of systems such as radar, communication, and electronic countermeasures. The realization of the functions of many modern electronic devices and systems directly depends on the performance of the frequency source used. Today's high-performance frequency sources are all realized by frequency synthesis technology. [0003] The broadband fast frequency source is an important part of the electronic warfare transceiver, and the performance of the frequency source usually determines the optimal performance that the system can achieve. The current mainstream frequency synthesis methods are: PLL frequency synthesis method, DDS frequency synthesis method, and hybrid frequency synthesis method. These frequency s...

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Problems solved by technology

[0004] In the broadband frequency synthesis method, the PLL frequency synthesis method is generally used. In the PLL frequency synthesis method, in order to improve the phase noise index, a design method of in-loop frequency mixing is often used to achieve it. However, due to the Introduced, wrong locks will inevitably occur. In the existing technical solutions, there are already lock assist methods including D / A circuits and lock assist rings. Inherent defects, difficult to be widely used

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