High-accuracy broadband continuous adjustable real-time time delay line circuit

Abstract

The invention discloses a high-accuracy broadband continuous adjustable real-time time delay line circuit, adopts a method of combining an active coarse adjustment time delay line with a passive fine adjustment time delay line and improves a bandwidth and a time delay range of the time delay line circuit. The active coarse adjustment time delay line comprises an active voltage control time delay unit and a path selection amplifier. The passive fine adjustment time delay line is formed by cascading a plurality of inductor and variable capacitor pairs, by changing a voltage control variable capacitance value, delay time of the fine adjustment time delay line is changed, and the delay time can make up resolution of coarse adjustment time delay, thereby implementing the delay time continuous change of a real-time time delay line. The real-time time delay line carries out time delay accurate control on active time delay units by a time delay calibration loop, so that time delay is not influenced by changes of the outside environment. The circuit has the advantages of high time delay resolution, wide time delay range, high anti-interference capacity, broadband, high integration, low cost and easiness for integration.

Description

technical field [0001] The invention relates to a delay line circuit, in particular to a high-precision broadband continuously adjustable real-time delay line circuit. Background technique [0002] In recent years, high transmission rates have been paid more and more attention to in wireless communication systems. Real-time delay lines play an important role in ultra-wideband time-steered array beamforming technology, multiple-input multiple-output radar arrays and high-speed equalizer applications. character of. The real-time delay line with high delay resolution has the advantages of wide range of receiving angle, long receiving distance, high transmission rate and strong anti-interference ability in the application of timed array array. [0003] At present, the delay line circuit is mostly implemented in the form of optical devices, MEMS (Micro-Electro-Mechanical System, Micro-Electro-Mechanical System) and electronic devices. When optical devices or MEMS are used, the ...

AI Technical Summary

Problems solved by technology

However, in the case of active integrated circuits, the circuit is easily affected by changes in the external environment such as process, power supply voltage and temperature, and the delay deviation is large

At the same time, active devices tend to bring higher impedance and lower poles, and the large delay range limits the effective bandwidth of the circuit.

Therefore, the delay line circuit formed by active integration has the disadvantages of high power consumption, low bandwidth, and large deviation

In the case of passive integration, in order to achieve the desired delay time, different passive devices need to be integrated, so that the circuit often occupies a large area, the insertion loss is large, and the integration method is more complicated

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