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Equalizing filter with high gain and wide compensation range

A technology for equalizing filters and compensating ranges, applied in impedance networks, digital technology networks, electrical components, etc., can solve problems such as dependence on clocks, large circuit footprint, and low signal rate

Active Publication Date: 2014-04-23
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Digital equalizers can achieve equalization effects through different algorithms, but they have disadvantages such as clock dependence, low signal rate that can be equalized, and large circuit footprint.

Method used

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  • Equalizing filter with high gain and wide compensation range
  • Equalizing filter with high gain and wide compensation range
  • Equalizing filter with high gain and wide compensation range

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Embodiment Construction

[0019] In order to further illustrate the advantages of the present invention, the specific implementation manner and circuit structure of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] The equalization filter is composed of a two-stage cascaded differential amplifier and a first-stage feedback differential amplifier;

[0021] Among them, the first pair of NMOS transistors M1, M2, the first pair of variable resistors and variable capacitors R 0 , C 0 , the first pair of resistors R 1 , R 2 Form the first differential amplifier; the first pair of resistors R 1 , R 2 respectively connected to the drain of the first pair of NMOS transistors M1, M2 and V DD between the load, the first pair of variable resistors and variable capacitors R 0 , C 0 Connect across the sources of the first pair of NMOS transistors M1 and M2, and the gates of the first pair of NMOS transistors M1 and M2 are respectively connected to ...

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Abstract

The invention discloses an equalizing filter with high gain and wide compensation range, which is formed by a two-stage cascade differential amplifier and a one-stage feedback differential amplifier. According to the equalizing filter with the high grain and the wide compensation range, a structure of a traditional active negative feedback equalizing filter is improved, so that the feedback quantity of negative feedback is adjustable, the variable range of high-frequency gain is improved, and the compensation ability of the equalizing filter is increased. In order to enable the feedback quantity to be adjustable, a source electrode negative feedback technology is introduced into a common feedback differential amplifier, i.e. a variable resistor and a variable capacitor which are connected in parallel are added on a feedback differential pair source electrode. Low-frequency feedback quantity and high-frequency feedback quantity can be respectively changed through controlling the magnitude of the variable resistor and that of the variable capacitor, so that low-frequency gain, high-frequency gain, and adjustable ranges thereof are controlled. In addition, the higher circuit performance can be realized through multi-stage cascade. The equalizing filter with the high grain and the wide compensation range has the advantages of large bandwidth, strong gain compensation capacity, large gain compensation range and the like.

Description

technical field [0001] The invention belongs to the field of semiconductor integrated circuit design, and mainly relates to an equalizing filter with high gain and high compensation range. Background technique [0002] Modern communication systems have higher and higher requirements for communication rates. For example, the transmission rates of bus interfaces such as USB3.0, HDMI1.4, SATA3.0, and PCI Express have reached several Gb / s or even more than ten Gb / s. At such a high data transmission rate, the high-frequency loss of the data transmission channel caused by the skin effect and dielectric loss will have a serious impact on the integrity of the signal, and it is easy to cause Inter-Symbol Interference (ISI). For example, at 3.125GHz, when the channel loss is greater than 6dB, the attenuation of 6.25Gb / s data at the receiving end will exceed 50%. At this time, the signal eye diagram is completely closed and the data becomes unrecoverable. [0003] In order to overcome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
Inventor 张长春赵宗良李志贞赵江刘蕾蕾郭宇锋
Owner NANJING UNIV OF POSTS & TELECOMM
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