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An equalization circuit

A technology of equalizing circuits and resistors, which is applied in the direction of negative feedback circuit layout, logic circuit connection/interface layout, and improved amplifier to expand bandwidth. Bandwidth effect

Active Publication Date: 2015-07-22
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-speed data transmission in the transmission line has the intersymbol interference introduced by the transmission loss of the transmission line, which limits the transmission rate and transmission speed

Method used

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  • An equalization circuit

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Embodiment Construction

[0012] The basic idea of ​​the technical solution realized by the equalization circuit is: adopt two-stage amplifiers, the first-stage amplifier is a high-pass amplifier, and the second-stage amplifier is a transconductance amplifier with feedback. Both the high-pass amplifier and the transconductance amplifier have dual differential inputs and dual differential outputs.

[0013] The signal is attenuated by the high-frequency part of the transmission line, and first passes through a high-pass amplifier. The bandwidth of the high-pass amplifier is not very large and the gain of the high-frequency part is limited. The high-pass amplifier uses two NMOS transistors as the input of the differential pair of tubes, a capacitor and an adjustable NMOS linear resistor are respectively straddled between the source stages of the two differential input NMOS transistors, and the common source is composed of four NMOS transistors below A common-gate current source supplies current, introduci...

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Abstract

The invention discloses an equalization circuit. The equalization circuit comprises: a high-pass amplifier, which has two differential inputs and two differential outputs, and introduces one zero point; and a transconductance amplifier with feedback, which has two differential inputs and two differential outputs, wherein the inputs of the transconductance amplifier are connected to the outputs of the high-pass amplifier, the outputs of the transconductance amplifier are fed back to the outputs of the high-pass amplifier through two NMOS transistors, another zero point is introduced in a feedback loop of the transconductance amplifier, and the bandwidth is increased by adjusting positions of the two zero points. According to the equalization circuit, the gain of a high frequency part of the equalization circuit can reach 20 dB, so that a larger bandwidth can be achieved, and it is avoided that significant attenuation of the high frequency part occurs in transmission at a high rate; moreover, the circuit is small in occupied area and low in power consumption, relatively.

Description

technical field [0001] The invention relates to the field of CMOS integrated circuit design, in particular to a high-bandwidth equalization circuit. Background technique [0002] Interface circuits play a key role in communication. With the development of communication technology and the increasing complexity of signal processing, the design and development of communication interface circuits have encountered unprecedented challenges. Due to the problem of synchronization between queues in parallel communication and the influence of noise such as crosstalk, most of the inter-chip communication adopts serial communication, and serial communication has developed rapidly, and has the advantages of faster, more reliable, and less pins. . [0003] With the development of architecture technology and semiconductor technology, the clock frequency of serial communication on the integrated circuit chip increases rapidly. A key problem is that there is frequency-dependent transmissio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/42H03F1/34H03F3/45H03K19/0175
Inventor 郭婷婷易金刚
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT