CN113315534A - Voltage mode signal transceiver and voltage mode signal transmitter thereof - Google Patents

Voltage mode signal transceiver and voltage mode signal transmitter thereof Download PDF

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Publication number
CN113315534A
CN113315534A CN202010086883.8A CN202010086883A CN113315534A CN 113315534 A CN113315534 A CN 113315534A CN 202010086883 A CN202010086883 A CN 202010086883A CN 113315534 A CN113315534 A CN 113315534A
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receiver
mode signal
voltage
capacitance
input
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CN202010086883.8A
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CN113315534B (en
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简廷旭
陈彦中
杜玟珑
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Taiwan Semiconductor Manufacturing Co TSMC Ltd
Global Unichip Corp
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Taiwan Semiconductor Manufacturing Co TSMC Ltd
Global Unichip Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits

Abstract

The invention provides a voltage mode signal transceiving device and a voltage mode signal transmitter thereof. The voltage mode signal transmitter includes a driver, an output resistor, and a compensation capacitor. The driver provides a transmit signal to an output, wherein the output is coupled to the receiver. The output resistor is connected in series between the coupling paths of the driver and the receiver. The compensation capacitor is coupled in parallel with the output resistor. The capacitance of the compensation capacitor is substantially equal to the capacitance of the equivalent capacitor at the input terminal of the receiver.

Description

Voltage mode signal transceiver and voltage mode signal transmitter thereof
Technical Field
The present invention relates to a voltage mode signal transceiver and a voltage mode signal transmitter thereof, and more particularly, to a voltage mode signal transceiver and a voltage mode signal transmitter thereof capable of increasing a working bandwidth.
Background
As the operating bandwidth of the voltage-mode signal transmitter increases, the parasitic capacitance at the output of the voltage-mode signal transmitter, i.e., the package, causes a problem of so-called inter-symbol-interference, which reduces the jitter performance of the voltage-mode signal transmitter. In the prior art, a pre/de-emphasis (pre-emphasis) circuit is often provided to equalize the channel response of the voltage mode signal transmitter. However, this may cause a decrease in the amplitude of the output transmission signal, in addition to making the circuit architecture more complicated. Reducing the performance of the voltage mode signal transmitter.
Disclosure of Invention
The invention aims at a voltage mode signal transceiving device and a voltage mode signal transmitter thereof, which can increase the working bandwidth.
According to an embodiment of the present invention, a voltage mode signal transmitter includes a driver, an output resistor, and a compensation capacitor. The driver provides a transmit signal to an output, wherein the output is coupled to the receiver. The output resistor is connected in series between the coupling paths of the driver and the receiver. The compensation capacitor is coupled in parallel with the output resistor. The capacitance of the compensation capacitor is substantially equal to the capacitance of the equivalent capacitor at the input terminal of the receiver.
In an embodiment according to the invention, the equivalent capacitance at the input of the receiver is the capacitance between the input of the receiver and the reference ground.
In an embodiment of the invention, the compensation capacitor is a variable capacitor.
In an embodiment according to the invention, the voltage mode signal transmitter further comprises a capacitive sensor. The capacitance sensor is coupled to the input end of the receiver, and is used for detecting the capacitance value of the equivalent capacitance on the input end of the receiver and generating a control signal.
In an embodiment of the invention, the capacitance of the compensation capacitor is adjusted according to the control signal.
In an embodiment of the invention, the driver includes a first transistor and a second transistor. The first transistor has a first terminal receiving a power supply voltage, a second terminal providing a transmit signal, and a control terminal receiving a first input signal.
According to an embodiment of the present invention, a voltage mode signal transceiving apparatus comprises a receiver and a voltage mode signal transmitter as described above. The receiver is coupled to the voltage mode signal transmitter.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic diagram of a voltage mode signal transceiver according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an implementation of a driver of an embodiment of the present invention;
fig. 3A is a schematic diagram of a voltage mode signal transceiver according to another embodiment of the invention;
FIG. 3B is a diagram of a compensation capacitor according to an embodiment of the present invention;
fig. 4 is a waveform diagram of an input signal received by a receiver according to an embodiment of the invention.
Description of the reference numerals
100. 300, and (2) 300: a voltage mode signal transceiver;
110. 310: a voltage mode signal transmitter;
111. 311: a driver;
120. 320, and (3) respectively: a receiver;
200: a driver;
312: a capacitance detector;
CL: an equivalent capacitance;
CS: a compensation capacitor;
CS1-CSN: a capacitor;
CTR: a control signal;
CV1, CV 2: a waveform;
GND: a reference ground terminal;
IE: an input end;
IN1, IN 2: inputting a signal;
m1, M2: a transistor;
OE: an output end;
RL: a load resistance;
RS: an output resistor;
SW 1-SWN: a switch;
Vi: transmitting a signal;
VO: inputting a signal.
Detailed Description
Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Referring to fig. 1, fig. 1 is a schematic diagram of a voltage mode signal transceiver according to an embodiment of the invention. The voltage-mode signal transceiving apparatus 100 comprises a voltage-mode signal transmitter 110 and a receiver 120. The voltage mode signal transmitter 110 includes a driver 111. The driver 111 is used for providing a transmitting signal ViTo the output OE of the voltage-mode signal transmitter 110, wherein the output OE of the voltage-mode signal transmitter 110 is coupled to the receiver 120. In the voltage mode signal transmitter 110 and having an output resistor RSAnd a compensation capacitor CS. Output resistor RSIs connected in series between the coupling paths of the driver 111 and the receiver 120. In this embodiment, the output resistor RSIs connected in series between the driver 111 and the output terminal OE of the voltage mode signal transmitter 110. Compensation capacitor CSThen and the output resistor RSAre coupled in parallel.
In another aspect, the receiver 120 provides a load resistance RLAnd, an equivalent capacitance C is provided between the input IE of the receiver 120 and the ground reference GNDL. The receiver 120 receives the transmission signal V at its input IEiGenerated input signal VO。
Please note that, in the present embodiment, the compensation capacitor CSCan be set to be equal to the equivalent capacitance CLAre equal. Under such conditions, the input signal VOAnd a transmission signal ViThe relationship between them can be expressed by the following formula (1):
Figure BDA0002382378740000031
wherein Z isLLoad resistors R coupled in parallel with each otherLAnd equivalent capacitance CLThe equivalent impedance provided. ZSOutput resistors R coupled in parallel with each otherSAnd a compensation capacitor CSThe equivalent impedance provided. At an equivalent capacitance CLAnd a compensation capacitor CSInput signal V with the same capacitanceOCan be independent of the frequency.
Incidentally, in the embodiment of the present invention, the compensation capacitor CSCan be regarded as a boost capacitor and can be based on the transmission signal ViFor an input signal V transmitted to the input IE of the receiver 120OThe voltage is raised. And, in the input signal VOCan be independent of the frequency of the voltage mode signal transceiver device 100, the operating bandwidth of the voltage mode signal transceiver device 100 can be effectively increased.
In addition, in practical application, the equivalent capacitance C should be adjusted to have a certain degree of error based on the component designLAnd a compensation capacitor CSHaving exactly the same capacitance value may have some difficulty. Therefore, in the embodiment of the present invention, the equivalent capacitance C is usedLSubstantially equal to the compensation capacitor CSThe capacitance values of (a) are equal, and the operation bandwidth of the voltage mode signal transceiver 100 can also be effectively increased.
Referring to fig. 2, fig. 2 is a schematic diagram of an embodiment of a driver according to the present invention. In FIG. 2, the driving in the voltage mode signal transmitter applied to the embodiment of the present inventionThe device 200 includes transistors M1 and M2. A first terminal of the transistor M1 receives the supply voltage VDDThe second terminal of the transistor M1 provides the emission signal ViThe control terminal of the transistor M1 receives the input signal IN 1. The first terminal of the transistor M2 is coupled to the second terminal of the transistor M1, the second terminal of the transistor M2 is coupled to the ground reference GND, and the control terminal of the transistor M2 receives the input signal IN 2.
In the present embodiment, the conductivity types of the transistors M1 and M2 may be complementary. The input signal IN1 and the input signal IN2 may be the same signal.
In addition, the driving circuit known to those skilled in the art can also be applied to the driver of the embodiment of the present invention, and is not limited to the implementation of fig. 2. The embodiment of fig. 2 is merely an example, and is not intended to limit the scope of the present invention.
Referring to fig. 3A, fig. 3A is a schematic diagram of a voltage mode signal transceiver according to another embodiment of the invention. The voltage-mode signal transceiving apparatus 300 comprises a voltage-mode signal transmitter 310 and a receiver 320. The voltage mode signal transmitter 310 includes a driver 311, a capacitance sensor 312, an output resistor RSAnd a compensation capacitor CS. In this embodiment, the compensation capacitor CSMay be a variable capacitance. And, a compensation capacitor CSThe capacitance value of (c) can be adjusted according to the control signal CTR.
Receiver 320 having a load resistor R thereinLAnd an equivalent capacitance CL. The control signal CTR can be based on the equivalent capacitance CLTo generate the capacitance value of (c). In the embodiment of the present invention, the capacitance sensor 312 is used to detect the equivalent capacitance CLThe capacitance value of (2). And based on the detected equivalent capacitance CLTo generate the control signal CTR. By receiving the control signal CTR generated by the capacitive sensor 312, the capacitance C is compensatedSCan be adjusted to be equal to the equivalent capacitance CLThe capacitance values are substantially the same, thereby increasing the operating bandwidth of the voltage-mode signal transceiver 300.
In another embodiment of the present invention, it is not necessary to provide capacitive coupling in the voltage mode signal transmitter 310A sensor 312. Wherein, in the equivalent capacitance CLUnder the condition that the capacitance value of the compensation capacitor C is known, the control signal CTR can be generated by an external writing mode, and the compensation capacitor C is adjusted by the control signal CTRSCapacitance value and equivalent capacitance C ofLAre substantially the same. The external writing method may be performed by performing a command and data writing operation on one or more input pins of the voltage mode signal transmitter 310, or may be performed by providing a nonvolatile memory element in the voltage mode signal transmitter 310 and performing a writing operation on the nonvolatile memory element, without any fixed limitation.
With respect to the compensation capacitor C being a variable capacitorSThe hardware architecture of (1) can be implemented by any variable capacitor known to those skilled in the art, which can be adjusted by an electrical signal, without fixed limitation.
Incidentally, in practical use, when the kind of the receiver 320 corresponding to the voltage mode signal transmitter 310 is known. Equivalent capacitance C for various receivers 320LThe capacitance values of the first and second capacitors are classified and the control signal CTR is generated according to the type of the receiver 320 currently used. To be specific, if the capacitance of the equivalent capacitor CL of the receiver 320 can be divided into four types according to the magnitude, the control signals CTR corresponding to the four types of the receiver 320 can be set to two-bit logic signals 00, 01, 10 and 11, respectively. Equivalent capacitance C of receiver 320 when voltage mode signal transmitter 310 is coupledLThe capacitance value of (C) is of the second type, the control signal CTR in the voltage-mode signal transmitter 310 can be set to 01, and the compensation capacitor C can be completed quickly and efficientlySThe setting operation of the capacitance value of (2).
With respect to the compensation capacitance CSReference may be made to fig. 3B, wherein fig. 3B is a schematic diagram of an embodiment of a compensation capacitor according to the present invention. In FIG. 3B, the compensation capacitor CSBy a plurality of capacitors CS1～CSNAnd a plurality of switches SW1 to SWN. Capacitor CS1～CSNAre respectively connected with the switches SW 1-SWN in series to form a plurality of capacitance switch strings. Capacitor switch series-parallel connectionWhich are coupled in parallel with each other. In the present embodiment, the switches SW 1-SWN are controlled by the control signal CTR to be turned on or off, respectively. The control signal CTR may have N bits and control the on or off states of the switches SW 1-SWN, respectively. In the process of compensating the capacitor CSThe adjustment of the capacitance value (c) can be performed by turning on different numbers of switches SW 1-SWN.
In this embodiment, the capacitor CS1～CSNMay be the same or may be in a predetermined proportional relationship, e.g. capacitance CS1～CSNThe ratio of the capacitance values of (a) may be 1: 21：22：…：2N-1. Thus, the capacitor C is usedS1Taking UC as an example, the compensation capacitor C can be made by turning on one or more of the switches SW 1-SWNSThe capacitance value of (C) can be equal to UC multiplied by M, wherein M can be between 1 and 2NIs an integer between.
Referring to fig. 4, fig. 4 is a waveform diagram of an input signal received by a receiver according to an embodiment of the invention. The waveform CV1 is the waveform of the input signal with the compensation capacitor added, and the waveform CV2 is the waveform of the input signal with the compensation capacitor removed. Here, it can be clearly found that by providing the compensation capacitor in the voltage mode signal transmitter, the eye width (eye width) in the eye diagram (eye diagram) formed by the input signal can be effectively increased, which means that the operating bandwidth of the voltage mode signal transceiver is effectively increased.
In summary, the present invention simply connects a compensation capacitor in parallel to the output resistor of the voltage mode signal transmitter, and makes the capacitance values of the compensation capacitor and the equivalent capacitor of the receiver substantially equal. Therefore, the amplitude of the input signal received by the receiver is independent (independent) from the frequency of the input signal, and the working bandwidth of the voltage mode signal transceiver can be effectively improved. Under the condition of considering both circuit cost and design difficulty, the expressive degree of the voltage mode signal transceiver is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (11)

1. A voltage-mode signal transmitter coupled to an input of a receiver, comprising:
a driver providing a transmit signal to an output, wherein the output is coupled to the receiver;
the output resistor is connected between the coupling paths of the driver and the receiver in series; and
a compensation capacitor coupled in parallel with the output resistor;
wherein the capacitance value of the compensation capacitor is substantially equal to the capacitance value of the equivalent capacitor at the input terminal of the receiver.
2. The voltage-mode signal transmitter of claim 1, wherein the equivalent capacitance at the input of the receiver is a capacitance between the input of the receiver and a reference ground.
3. The voltage mode signal transmitter of claim 1, wherein the compensation capacitor is a variable capacitor.
4. The voltage-mode signal transmitter of claim 1, further comprising:
the capacitance sensor is coupled to the input end of the receiver and used for detecting the capacitance value of the equivalent capacitance on the input end of the receiver and generating a control signal.
5. The voltage-mode signal transmitter of claim 1, wherein a capacitance value of the compensation capacitor is adjusted according to a control signal.
6. The voltage-mode signal transmitter of claim 1, wherein the driver comprises:
a first transistor having a first terminal receiving a power supply voltage, a second terminal providing the transmission signal, and a control terminal receiving a first input signal; and
a second transistor having a first terminal coupled to the second terminal of the first transistor, a second terminal coupled to a ground reference terminal, and a control terminal receiving a second input signal.
7. A voltage mode signal transceiving apparatus, comprising:
a receiver; and
a voltage-mode signal transmitter coupled to an input of the receiver, wherein the voltage-mode signal transmitter comprises;
a driver providing a transmit signal to an output, wherein the output is coupled to the receiver;
the output resistor is connected between the coupling paths of the driver and the receiver in series; and
a compensation capacitor coupled in parallel with the output resistor,
wherein the capacitance value of the compensation capacitor is substantially equal to the capacitance value of the equivalent capacitor at the input terminal of the receiver.
8. The voltage mode signaling device of claim 7 wherein said input of said receiver provides said equivalent capacitance and said equivalent resistance, wherein said equivalent capacitance and said equivalent resistance are coupled in parallel between said input of said receiver and a reference ground.
9. The voltage mode signaling apparatus of claim 7 wherein said compensation capacitor is a variable capacitor.
10. The voltage mode signal transceiving apparatus of claim 9, wherein the voltage mode signal transmitter further comprises a capacitance sensor coupled to the input of the receiver for detecting a capacitance value of the equivalent capacitance at the input of the receiver and generating a control signal.
11. The apparatus according to claim 10, wherein the capacitance of the compensation capacitor is adjusted according to the control signal.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1419722A (en) * 2000-02-04 2003-05-21 斯特拉托斯光波公司 Automatic power control and laser sloep efficiency normalizing circuit
US20090238257A1 (en) * 2008-03-19 2009-09-24 Cray Inc. Lonely pulse compensation
CN201654232U (en) * 2010-04-30 2010-11-24 浙江天煌科技实业有限公司 Intelligent ultrasonic distance measuring sensor
US20160380607A1 (en) * 2015-06-23 2016-12-29 Qualcomm Incorporated Signal interconnect with high pass filter
CN107852154A (en) * 2015-07-13 2018-03-27 赛灵思公司 The circuit and method of modulated signal are produced in the transmitter
CN109245758A (en) * 2017-07-11 2019-01-18 爱思开海力士有限公司 Transmitter and acceptor circuit
CN110165725A (en) * 2019-04-26 2019-08-23 华为技术有限公司 Wireless charging method, receiver, terminal device and charger

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1419722A (en) * 2000-02-04 2003-05-21 斯特拉托斯光波公司 Automatic power control and laser sloep efficiency normalizing circuit
US20090238257A1 (en) * 2008-03-19 2009-09-24 Cray Inc. Lonely pulse compensation
CN201654232U (en) * 2010-04-30 2010-11-24 浙江天煌科技实业有限公司 Intelligent ultrasonic distance measuring sensor
US20160380607A1 (en) * 2015-06-23 2016-12-29 Qualcomm Incorporated Signal interconnect with high pass filter
CN107852154A (en) * 2015-07-13 2018-03-27 赛灵思公司 The circuit and method of modulated signal are produced in the transmitter
CN109245758A (en) * 2017-07-11 2019-01-18 爱思开海力士有限公司 Transmitter and acceptor circuit
CN110165725A (en) * 2019-04-26 2019-08-23 华为技术有限公司 Wireless charging method, receiver, terminal device and charger

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