A multi-tap delay circuit and its design method

By designing a multi-tap delay circuit with a negative feedback loop in the RF multi-tap self-interference suppressor, the problem of insufficient amplitude and delay adjustment accuracy in the prior art is solved, and a higher precision self-interference suppression effect is achieved.

CN114172489BActive Publication Date: 2025-03-1836TH RES INST OF CETC
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Patent Information

Application Number
CN202111341544.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-11-12
Publication Date
2025-03-18
Estimated Expiration
2041-11-12

AI Technical Summary

Technical Problem

The existing RF multi-tap self-interference suppressors have limited phase and amplitude accuracy in engineering implementation, and the tap's delay adjustment and amplitude adjustment accuracy are insufficient, which affects the self-interference suppression effect.

Method used

A multi-tap delay circuit is designed, using two couplers and two CNC attenuators to form a negative feedback loop. By adjusting the attenuation amount of the second CNC attenuator of the negative feedback branch, the high-precision adjustment of the amplitude is improved.

Benefits of technology

It realizes higher precision control of the total attenuation amount of the circuit, improves the self-interference suppression effect, and improves the accuracy by nearly 10 times compared to traditional technology.

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Abstract

The present invention discloses a multi-tap delay circuit and a design method thereof. The multi-tap delay circuit includes: a shunt circuit, a combining circuit and N taps, the N taps are connected in parallel between the shunt circuit and the combining circuit, and each tap includes: a first coupler, a second coupler, a first digitally controlled attenuator and a second digitally controlled attenuator; the input end of the first coupler is connected to the input end of the tap, the output end of the first coupler is connected to the input end of the first digitally controlled attenuator, the output end of the first digitally controlled attenuator is connected to the input end of the second coupler, the output end of the second coupler is connected to the output end of the tap, the coupling end of the second coupler is connected to the input end of the second digitally controlled attenuator, and the output end of the second digitally controlled attenuator is connected to the coupling end of the first coupler. The technical solution of the present invention realizes higher-precision amplitude control of the total attenuation of the circuit, and provides a basis for self-interference suppression.
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