CN105812013A - Automatic calibration circuit and method for calibrating resistance of serial signal communication transceiving terminal - Google Patents
Automatic calibration circuit and method for calibrating resistance of serial signal communication transceiving terminal Download PDFInfo
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- CN105812013A CN105812013A CN201410845155.5A CN201410845155A CN105812013A CN 105812013 A CN105812013 A CN 105812013A CN 201410845155 A CN201410845155 A CN 201410845155A CN 105812013 A CN105812013 A CN 105812013A
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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
The present invention relates to technical field of integrated circuits, particularly the auto-calibration circuits of serial signal transceiver communication terminal resistance and method.
Background technology
In serial signal communicates, the terminal resistance of transmitting terminal and receiving terminal is typically necessary and is calibrated to 50ohm, is likely to as other values according to the requirement of agreement.General way is manually to remove trim, and relatively time-consuming effort is not very convenient.
Summary of the invention
The present invention is to solve the problems referred to above, and this method provided herein, it is possible to achieve automatically calibrate, as long as chip powers on, will automatically by sending and receiving end resistance calibration to required value, it is not necessary to manually go to adjust, enhanced convenience, precisely.
Technical scheme is as follows:
The auto-calibration circuits of serial signal transceiver communication terminal resistance, it is characterized in that: the difference of target alignment resistance Rcal Yu off-chip reference resistance Rref is changed into voltage difference Vdiff by current source Isource, Vdiff amplifies through prime amplifier preamp, then make a gift to someone comparator comparator, comparator one low and high level of output, digital module below can judge the size of target alignment resistance Rcal and reference resistance Rref by the low and high level that comparator exports, thus changing codeRcal<4:0>, reach the purpose of calibrating resistance.
Described reference voltage Rref is the accurate resistance of off-chip.
Described reference current source Isource is configurable, such that it is able to change the size of Isource flexibly, produces variable Vdiff, facilitates the amplifier of rear class to detect.
Described prime amplifier is to be amplified by Vdiff, making the comparator of rear class be able to detect that.
The signal detecting method of serial signal communication receiver, as shown in Figure 1.Rref is off-chip reference resistance, Rcal is target alignment resistance, Isource is poly electric current, if target resistance Rcal is more than Rref, then Vcal is less than the difference Vdiff between Vref, Vref-Vcal after a preamplifier is amplified, is then passed to a comparator, comparator one high level of output, DigitalFSM then adjusts Rcal<4:0>reduce target resistance Rcal.On the contrary, if Rcal is less than Rref, then one low level of comparator output, DigitalFSM adjusts Rcal<4:0>increase target resistance Rcal.Final lock-out state is that comparator constantly overturns between low and high level, Rcal<4:0>continuous saltus step between two code.Rcal_TX<4:0>it is intended for the code of TX terminal resistance, with Rcal<4:0>equal.Rcal_RX<4:0>it is intended for the code of RX terminal resistance, with Rcal<4:0>equal
Beneficial effects of the present invention is as follows:
Automatic calibration can be realized, as long as chip powers on, will automatically by sending and receiving end resistance calibration to required value, it is not necessary to manually go to adjust, enhanced convenience, precisely.
Accompanying drawing explanation
Fig. 1 is the module-cascade block diagram of the present invention.
Fig. 2 is the prime amplifier structural representation of the present invention.
Fig. 3 is the comparator configuration schematic diagram of the present invention.
Detailed description of the invention
As shown in Figure 1.This figure is the connection diagram of whole circuit.
The auto-calibration circuits of serial signal transceiver communication terminal resistance, the difference of target alignment resistance Rcal Yu off-chip reference resistance Rref is changed into voltage difference Vdiff by current source Isource, Vdiff amplifies through prime amplifier preamp, then make a gift to someone comparator comparator, comparator one low and high level of output, digital module below can judge the size of target alignment resistance Rcal and reference resistance Rref by the low and high level that comparator exports, thus changing codeRcal<4:0>, reach the purpose of calibrating resistance.
Described reference voltage Rref is the accurate resistance of off-chip.
Described reference current source Isource is configurable, such that it is able to change the size of Isource flexibly, produces variable Vdiff, facilitates the prime amplifier preamp of rear class to detect.
Described prime amplifier is to be amplified by Vdiff, making the comparator comparator of rear class be able to detect that.
The signal detecting method of serial signal communication receiver, as shown in Figure 1.Rref is off-chip reference resistance, Rcal is target alignment resistance, Isource is poly electric current, if target resistance Rcal is more than Rref, then Vcal is less than the difference Vdiff between Vref, Vref-Vcal after a preamplifier amplifies preamp, is then passed to a comparator comparator, comparator comparator exports a high level, and DigitalFSM then adjusts Rcal<4:0>reduce target resistance Rcal.On the contrary, if Rcal is less than Rref, then comparator comparator exports a low level, and DigitalFSM adjusts Rcal<4:0>increase target resistance Rcal.Final lock-out state is, comparator comparator constantly overturns between low and high level, Rcal<4:0>continuous saltus step between two code.Rcal_TX<4:0>it is intended for the code of TX terminal resistance, with Rcal<4:0>equal.Rcal_RX<4:0>it is intended for the code of RX terminal resistance, with Rcal<4:0>equal
Beneficial effects of the present invention is as follows:
Automatic calibration can be realized, as long as chip powers on, will automatically by sending and receiving end resistance calibration to required value, it is not necessary to manually go to adjust, enhanced convenience, precisely.
Claims (8)
1. the auto-calibration circuits of serial signal transceiver communication terminal resistance, it is characterized in that: target alignment resistance Rcal and reference resistance Rref is compared, the difference of Rcal and Rref changes into voltage difference Vdiff by current source, Vdiff is after prime amplifier preamp amplifies, send into comparator, comparator output low and high level judges the magnitude relationship of target resistance Rcal and Rref, comparator exports digital module DigitalFSM, and digital module is by adjusting output codeRcal<4:0>realize the calibration to resistance.
2. the auto-calibration circuits of serial signal transceiver communication terminal resistance according to claim 1, it is characterised in that: being compared by target alignment resistance Rcal and reference resistance Rref, the difference of Rcal and Rref changes into voltage difference Vdiff by current source.
3. the auto-calibration circuits of serial signal transceiver communication terminal resistance according to claim 1, it is characterised in that: Vdiff to first pass through prime amplifier preamp and amplify.
4. the auto-calibration circuits of serial signal transceiver communication terminal resistance according to claim 1, it is characterised in that: in order to reduce the impact of prime amplifier preamp imbalance, it is possible to increase the electric current of current source Isource.
5. the auto-calibration circuits of serial signal transceiver communication terminal resistance according to claim 1, it is characterised in that: in order to reduce the imbalance of prime amplifier preamp, it is possible to increase the prime amplifier preamp input size to pipe.
6. the auto-calibration circuits of serial signal transceiver communication terminal resistance according to claim 1, it is characterised in that: in order to reduce the impact of comparator comparator imbalance, it is possible to increase the gain of prime amplifier, it is also possible to add first stage amplifier again.
7. the auto-calibration circuits of serial signal transceiver communication terminal resistance according to claim 1, it is characterised in that: in order to reduce the imbalance of comparator comparator, it is possible to increase the comparator comparator input size to pipe.
8. the auto-calibration circuits of serial signal transceiver communication terminal resistance according to claim 1, the digital module DigitalFSM output according to comparator, adjust codeRcal<4:0 automatically>, the value making Rcal is close to reference resistance Rref.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410845155.5A CN105812013A (en) | 2014-12-31 | 2014-12-31 | Automatic calibration circuit and method for calibrating resistance of serial signal communication transceiving terminal |
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| CN201410845155.5A CN105812013A (en) | 2014-12-31 | 2014-12-31 | Automatic calibration circuit and method for calibrating resistance of serial signal communication transceiving terminal |
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| CN105812013A true CN105812013A (en) | 2016-07-27 |
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| CN201410845155.5A Pending CN105812013A (en) | 2014-12-31 | 2014-12-31 | Automatic calibration circuit and method for calibrating resistance of serial signal communication transceiving terminal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112650344A (en) * | 2020-12-22 | 2021-04-13 | 成都华微电子科技有限公司 | Configurable terminal matching resistance calibration circuit |
| CN112799457A (en) * | 2020-12-31 | 2021-05-14 | 深圳市紫光同创电子有限公司 | Voltage calibration circuit and method |
| CN113381823A (en) * | 2021-06-09 | 2021-09-10 | 北京集睿致远科技有限公司 | Output voltage amplitude calibration circuit and method for sending system |
| CN116054973A (en) * | 2023-04-03 | 2023-05-02 | 荣湃半导体（上海）有限公司 | Self-calibration receiver for isolator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101251557A (en) * | 2008-03-21 | 2008-08-27 | 苏州长新微电子有限公司 | Built-in permanence resistor automatic calibration method for high-precision circuit |
| US20080211534A1 (en) * | 2007-03-02 | 2008-09-04 | Hynix Semiconductor Inc. | Impedance matching circuit and semiconductor memory device with the same |
| CN102468840A (en) * | 2010-11-04 | 2012-05-23 | 联发科技股份有限公司 | Differential driver with calibration circuit and related calibration method |
| CN103076834A (en) * | 2012-12-28 | 2013-05-01 | 四川和芯微电子股份有限公司 | Resistor calibrating circuit |
-
2014
- 2014-12-31 CN CN201410845155.5A patent/CN105812013A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080211534A1 (en) * | 2007-03-02 | 2008-09-04 | Hynix Semiconductor Inc. | Impedance matching circuit and semiconductor memory device with the same |
| CN101251557A (en) * | 2008-03-21 | 2008-08-27 | 苏州长新微电子有限公司 | Built-in permanence resistor automatic calibration method for high-precision circuit |
| CN102468840A (en) * | 2010-11-04 | 2012-05-23 | 联发科技股份有限公司 | Differential driver with calibration circuit and related calibration method |
| CN103076834A (en) * | 2012-12-28 | 2013-05-01 | 四川和芯微电子股份有限公司 | Resistor calibrating circuit |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112650344A (en) * | 2020-12-22 | 2021-04-13 | 成都华微电子科技有限公司 | Configurable terminal matching resistance calibration circuit |
| CN112650344B (en) * | 2020-12-22 | 2022-07-29 | 成都华微电子科技股份有限公司 | Configurable terminal matching resistance calibration circuit |
| CN112799457A (en) * | 2020-12-31 | 2021-05-14 | 深圳市紫光同创电子有限公司 | Voltage calibration circuit and method |
| CN113381823A (en) * | 2021-06-09 | 2021-09-10 | 北京集睿致远科技有限公司 | Output voltage amplitude calibration circuit and method for sending system |
| CN113381823B (en) * | 2021-06-09 | 2022-08-12 | 北京集睿致远科技有限公司 | Output voltage amplitude calibration circuit and method for sending system |
| CN116054973A (en) * | 2023-04-03 | 2023-05-02 | 荣湃半导体（上海）有限公司 | Self-calibration receiver for isolator |
| CN116054973B (en) * | 2023-04-03 | 2023-06-13 | 荣湃半导体（上海）有限公司 | Self-calibration receiver for isolator |
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Application publication date: 20160727 |