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A device for canceling passive feedback network noise

A feedback network and noise technology, which is applied in the direction of improving the amplifier to reduce the impact of noise, can solve the problems of no literature introduction, no patent documents searched, etc., and achieve the effect of reducing noise contribution

Inactive Publication Date: 2015-12-23
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no relevant literature introduction, and no relevant patent documents have been searched.

Method used

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  • A device for canceling passive feedback network noise
  • A device for canceling passive feedback network noise
  • A device for canceling passive feedback network noise

Examples

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Embodiment Construction

[0025] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the examples and accompanying drawings. These two examples are only used to explain the present invention, and do not constitute a regulation to the protection scope of the present invention.

[0026] image 3 shown as figure 2 A specific implementation circuit diagram based on CMOS tube technology. Such as figure 1 and figure 2 The device for canceling the noise of the passive feedback network is composed of two parts: a current parallel negative feedback amplifier and a noise canceling circuit, wherein: the current parallel negative feedback amplifier is composed of a transconductance input stage 1 and a current parallel negative feedback network 2; the noise cancellation circuit is composed of a current signal amplification stage 3, a noise current signal detection stage 4 and a mixed current signal synthesis stage 5.

[0027]...

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Abstract

The invention discloses a device for offsetting passive feedback network noise. The device is formed by a current parallel connection reversed feedback amplifier and a noise offsetting circuit. The current parallel connection reversed feedback amplifier is composed of a transconductance input stage and a current parallel connection reversed feedback network, and the noise offsetting circuit is composed of a noise current signal detection stage, a current signal amplification stage and a mixed current signal synthesis stage. The output end of the noise current signal detection stage, the current signal amplification stage, the mixed current signal synthesis stage and loads are in cascade connection in sequence, a signal source, the input end of the noise current signal detection stage and the input end of the transconductance input stage are in series connection in sequence, and the output end of the transconductance input stage, the input end of the current parallel connection reversed feedback network and the other input end of the mixed current signal synthesis stage are in series connection in sequence. By means of the device, noise of a passive feedback network to the amplifier can be reduced.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a device for canceling passive feedback network noise. Background technique [0002] In a current shunt negative feedback amplifier composed of a transformer, the secondary coil of the transformer is connected in parallel with the input of the amplifier. In practice, two mutually coupled microstrip lines are often used to realize an integrated transformer. However, various non-ideal characteristics of the microstrip line itself, such as parasitic resistance, leakage inductance, and parasitic capacitance, will affect the dynamic performance of the amplifier, especially the Parasitic resistance has the most pronounced effect on amplifier noise performance. This is because when the number of turns is relatively large, the parasitic resistance of the secondary coil is also large, so its thermal noise is also large, and can be directly transferred to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26
Inventor 李效龙丁志鹏王彪田雨波解志斌张冰
Owner JIANGSU UNIV OF SCI & TECH
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