90-degree active bridge with ultra-broad band

Abstract

The invention provides a 90-degree active bridge with an ultra-broad band. The active bridge comprises a first all-pass filter network composed of 2n-stage cascade all-pass filters and a second all-pass filter network composed of 2n-stage cascade all-pass filters, wherein an angular frequency product of an i stage of the first all-pass filter network and a (2n-i+1) stage of the second all-pass filter network is a definite value, n is a positive integer, and i is in a range from 1 to 2n. According to the 90-degree active bridge with the ultra-broad band, the 90-degree active bridge is used in a broad band range of a baseband signal to perform a stable 90-degree phase shift for signals, the phase error range is less than 1 degree,two channels of signals which are subjected to the phase shift can be subjected to addition, subtraction and gain amplification, the active bridge can be excellently applied to the single side band output of the base band broad band signal close to zero frequency, simultaneously weak signal can be subjected to 100-time gain amplification, besides, the gain amplification is achieved and simultaneously the phase error range is controlled within 2 degrees, and the phase shift characteristic is stable.

Description

Technical field [0001] The present invention relates to an electric bridge with a phase shift function in a wide frequency range, in particular to an ultra-wide frequency band 90° active electric bridge. Background technique [0002] At present, the bridges that can realize the phase shift function in the wide frequency range are basically passive, and the better performance can only reach the bandwidth range of 0.5MHZ-30MHz. For baseband signals near zero frequency to 0.5MHZ and more The high-frequency baseband signal has poor phase-shifting performance, and the phase-shifting effect for signals close to zero frequency is very poor. It cannot reach 90°, and the application frequency range cannot be made larger, and the amplification function cannot be achieved. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide an ultra-wideband 90° active bridge to overcome the limited frequency range of the current passive bridge with pha...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a 90° active bridge with an ultra-wide frequency band, so as to overcome the limited frequency band range of the current passive bridge with a phase shift function, and the signal phase shift close to zero frequency cannot achieve stability. 90° technical issues

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