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Receiver with wide common-mode input range

A common mode, input terminal technology, applied in the field of transistor amplification, can solve the problems of system bit error rate reduction, influence, and signal vertical eye opening reduction.

Active Publication Date: 2016-08-24
XILINX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The transmission also causes Inter-Symbol Interference (ISI), where when a sequence of random symbols is transmitted, a current symbol will have an effect on adjacent symbols
As a result, the vertical eye opening of the signal processed by the receiver is reduced and the bit error rate of the system is reduced

Method used

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  • Receiver with wide common-mode input range
  • Receiver with wide common-mode input range
  • Receiver with wide common-mode input range

Examples

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Embodiment Construction

[0018] Due to different communication standards, the common-mode voltage can vary greatly between different transmitters. For example, some standards use high common-mode voltages while others use low common-mode voltages. To accommodate these various differential transmission circuits, flexible receiver designs need to be able to handle signals with different common-mode voltages.

[0019] One or more embodiments provide a differential amplifier configured to operate over a wide common-mode input range. The differential amplifier is implemented with complementary PMOS and NMOS source degenerated differential pairs connected in parallel. Each of the differential pairs is configured to compare differential input signals over a portion of the common mode range. For example, a PMOS differential pair can be configured to compare signals with a low common-mode voltage, and an NMOS differential pair can be configured to compare signals with a high common-mode voltage. The output ...

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PUM

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Abstract

In one embodiment, a differential amplifier (130) is provided. The gates of a first differential pair of transistors (132 / 134) of a first conductivity type and a second pair or transistors (146 / 148) of a second conductivity type are coupled to first and second input terminals of the differential amplifier superior. A first pair of adjustable power supplies (136 / 138) is configured to adjust respective tail currents of the first differential pair of transistors in response to a first bias current control signal. A second pair of adjustable power supplies (152 / 154) is configured to adjust respective tail currents of the second differential pair of transistors in response to the first bias current control signal. A third pair of adjustable power supplies (142 / 144) is configured to regulate respective currents through the second differential pair of transistors in response to a second bias current control signal.

Description

technical field [0001] Embodiments of the invention relate generally to transistor amplification, and more specifically, to differential amplifiers. Background technique [0002] A differential amplifier is a circuit that accepts inputs and determines the difference between the inputs. A typical differential amplifier takes two inputs and produces a signal representing the voltage difference between the two inputs. Differential comparators are used by many circuits, for example, analog-to-digital converters (ADCs) or transceiver circuits. [0003] Differential amplifiers are commonly used in communication systems to transfer signals between different circuits. For noise immunity reasons, most communication standards utilize differential signaling. In differential signaling, data is transmitted across two nodes in the form of a differential voltage. [0004] An ideal differential amplifier amplifies only the voltage difference between the two inputs. The voltage common t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45H03F1/52H03F3/72
CPCH03F1/523H03F3/45224H03F3/45233H03F3/72H04L27/0002H03H11/1213H03F2203/45568H03F2203/45494H03F2203/45466H03F2203/45092H03F2203/45091H03F2200/444H04L25/0276H03F2200/498
Inventor 林淑薇谢正祥贾法·萨弗
Owner XILINX INC
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