90-degree active bridge with ultra-broad band

An active bridge and ultra-wideband technology, applied in the field of 90° active bridge, can solve the problems that the signal phase shift cannot be achieved, the frequency range of the passive bridge is limited, etc.

Active Publication Date: 2015-07-01
SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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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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  • 90-degree active bridge with ultra-broad band
  • 90-degree active bridge with ultra-broad band
  • 90-degree active bridge with ultra-broad band

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] The present invention adopts an active all-pass network design to realize a 90° constant phase shift within a wide frequency band. The effect is not obvious, and the mutual influence is very small when multi-stage is connected. It is easy to form a high-order filter by using a simple method of cascading, and the filter is small in size, light in weight, and does not require magnetic shielding (because inductive components are not used); The active all-pass filter can realize the phase shift function in the frequency range, but the phase shift angle is different for each frequency point. The higher the order of the filter, the steeper the transition band of its amplitude-frequency characteristic, and the closer it is to the ideal characteristic. In general, the first-order filter transition band attenuates at a rate of 20dB per decade; the seco...

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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 invention relates to an electric bridge with a phase-shifting function within a wide frequency range, in particular to a 90° active electric bridge with an ultra-wide frequency band. Background technique [0002] At present, the bridges that can realize the phase shift function in a wide frequency range are basically passive, and the performance is relatively good, and they can only reach the bandwidth range of 0.5MHZ-30MHz. For baseband signals in the range from zero frequency to 0.5MHZ and more The phase shift performance of the baseband signal in the high frequency band is poor, and the phase shift effect for the signal close to zero frequency is very poor, which cannot reach 90°, and the frequency band range of the application cannot be made larger, and the amplification function cannot be realized. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a 90° active bridge with an ultra-wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H11/18
Inventor 江永琛王锦清范庆元
Owner SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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