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Automatic calibration circuit and method for calibrating resistance of serial signal communication transceiving terminal

A communication transceiver and terminal resistance technology, applied in electrical components, transmission monitoring, transmission systems, etc., can solve problems such as inconvenience, time-consuming and labor-intensive

Inactive Publication Date: 2016-07-27
北京华大九天科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The general method is to trim manually, which is time-consuming and laborious, and not very convenient

Method used

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  • Automatic calibration circuit and method for calibrating resistance of serial signal communication transceiving terminal
  • Automatic calibration circuit and method for calibrating resistance of serial signal communication transceiving terminal
  • Automatic calibration circuit and method for calibrating resistance of serial signal communication transceiving terminal

Examples

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Embodiment Construction

[0015] Such as figure 1 shown. This figure is a schematic diagram of the connection of the entire circuit.

[0016] The automatic calibration circuit of the serial signal communication transceiver terminal resistance converts the difference between the target calibration resistance Rcal and the off-chip reference resistance Rref into a voltage difference Vdiff through the current source Isource, and Vdiff is amplified by the preamplifier, and then sent to the comparator. The comparator outputs a high and low level, and the subsequent digital modules can judge the size of the target calibration resistance Rcal and the reference resistance Rref through the high and low levels output by the comparator, thereby changing codeRcal to achieve the purpose of calibrating the resistance.

[0017] The reference voltage Rref is an off-chip precision resistor.

[0018] The reference current source Isource is configurable, so that the size of Isource can be flexibly changed to generate a ...

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PUM

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Abstract

The invention discloses an automatic calibration circuit and a method for calibrating the resistance of a serial signal communication transceiving terminal, which is shown in FIG. 1. Rref represents an off-chip reference resistor, and Rcal represents a target calibration resistor. Isource represents the poly current. On the condition that the value of the Rcal is larger than the value of the Rref and Vcal is smaller than Vref, the difference value Vdiff of Vref - Vcal is sent to a comparator after being amplified by a pre-amplifier. After that, the comparator outputs a high level and a Digital FSM adjusts the Rcal<4:0> to reduce the value of the Rcal. Conversely, On the condition that the value of the Rcal is smaller than the value of the Rref, the comparator outputs a low level and the Digital FSM adjusts the Rcal<4:0> to increase the value of the Rcal.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an automatic calibration circuit and method for serial signal communication transceiver terminal resistance. Background technique [0002] In serial signal communication, the terminal resistance of the sending end and the receiving end generally need to be calibrated to 50ohm, and may also be other values ​​according to the requirements of the protocol. The general method is to trim manually, which is time-consuming and laborious, and not very convenient. Contents of the invention [0003] In order to solve the above problems, the method provided in this paper can realize automatic calibration. As long as the chip is powered on, the resistance of the transceiver end will be automatically calibrated to the required value without manual adjustment, which is more convenient and accurate. . [0004] Technical scheme of the present invention is as follows: [0005] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H04B17/00
Inventor 赵庆中唐重林项骏刘寅
Owner 北京华大九天科技股份有限公司