CN108365832A - The integrated circuit of impedance matching circuit and application impedance matching circuit - Google Patents
The integrated circuit of impedance matching circuit and application impedance matching circuit Download PDFInfo
- Publication number
- CN108365832A CN108365832A CN201710061668.0A CN201710061668A CN108365832A CN 108365832 A CN108365832 A CN 108365832A CN 201710061668 A CN201710061668 A CN 201710061668A CN 108365832 A CN108365832 A CN 108365832A
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- circuit
- impedance
- variable impedance
- reference voltage
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0005—Modifications of input or output impedance
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- Engineering & Computer Science (AREA)
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- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Networks Using Active Elements (AREA)
- Logic Circuits (AREA)
Abstract
The present invention relates to the integrated circuits of impedance matching circuit and application impedance matching circuit.A kind of impedance matching circuit includes a variable impedance circuit, a generating circuit from reference voltage and a control circuit, and the wherein variable impedance circuit is coupled to an impedance, and includes a variable impedance；The generating circuit from reference voltage is coupled to the variable impedance circuit, and to receive an input voltage of the variable impedance circuit to generate a reference voltage；And the control circuit is coupled to the variable impedance circuit, and to generate a control signal according to an output voltage of the reference voltage and the variable impedance circuit to control the variable impedance, make the variable impedance and the impedance matching.
Description
Technical field
Present invention is directed to an integrated circuits of an impedance matching circuit with the application impedance matching circuit.
Background technology
In recent years, due to the fast development of computer and communications industry, the IC design in present electronic product
All be high frequency, high speed design, operating frequency is up to tens of MHz to several GHz or more easily, if therefore the integrated circuit connect with it
When the impedance mismatch of the external circuit (a such as transmission line) connect, serious power attenuation will be caused.On communication transfer channel,
When data is transmitted at high speeds, there is the lower bit error rate to enable transmission and receive both ends, need impedance matching appropriate, work as letter
Number impedance mismatch is encountered it is typically the case that because there is inappropriate terminal resistance, causes have reflection or echo existing online in transmission
As reflection can make the bit transfer rate of data distortion and the system of reduction.Traditionally, the transmission line driver in integrated circuit is an electricity
Press driver, required output current be provided and goes driving load (i.e. transmission line) impedance, generally in order to transmission line impedance
Matching, between impedance value is about 50 ohm to 150 ohm, the impedance value can according to build-out, temperature with it is other it is external because
Element is influenced and is varied from, it is therefore more difficult to dynamically reach impedance matching.
Invention content
It is an object of the present invention to propose an impedance matching circuit and integrated using the one of the impedance matching circuit
Circuit is to solve the above problems.
An embodiment according to the present invention, discloses a kind of impedance matching circuit, including a variable impedance circuit, one are with reference to electricity
Pressure generation circuit and a control circuit, the wherein variable impedance circuit are coupled to an impedance, and include a variable impedance；The ginseng
It examines voltage generation circuit and is coupled to the variable impedance circuit, and to receive an input voltage of the variable impedance circuit to generate
One reference voltage；And the control circuit is coupled to the variable impedance circuit, and to according to the reference voltage and this can variable resistance
One output voltage of reactive circuit generates a control signal to control the variable impedance, makes the variable impedance and the impedance matching.
An embodiment according to the present invention, discloses a kind of integrated circuit, including an impedance matching circuit, the wherein impedance
Include with circuit:One variable impedance circuit, a generating circuit from reference voltage and a control circuit, the wherein variable impedance circuit
It is coupled to an impedance, and includes a variable impedance；The generating circuit from reference voltage is coupled to the variable impedance circuit, and to connect
An input voltage of the variable impedance circuit is received to generate a reference voltage；And the control circuit is coupled to variable impedance electricity
Road, and to generate a control signal according to an output voltage of the reference voltage and the variable impedance circuit to control this
Variable impedance makes the variable impedance and the impedance matching；Wherein the impedance is set to except the integrated circuit, and the impedance includes
One transmission line impedance.
Description of the drawings
Fig. 1 systems are according to the schematic diagram of the impedance matching circuit of one embodiment of the invention.
The schematic diagram of generating circuit from reference voltage and control circuit in the impedance matching circuit of Fig. 2 systems according to Fig. 1.
The schematic diagram of variable impedance circuit in the impedance matching circuit of Fig. 3 systems according to Fig. 1.
Fig. 4 systems are according to the change schematic diagram of the trigger signal of one embodiment of the invention and the impedance value of variable impedance circuit.
[symbol of figure briefly describes]
100 impedance matching circuits
110 transmitting circuits
120 variable impedance circuits
130 generating circuit from reference voltage
140 control circuits
10 impedances
The input endpoints IN
OUT exit points
VIN input voltages
VOUT output voltages
VREF reference voltages
CTRL controls signal
Specific implementation mode
Some vocabulary has been used in specification and subsequent claim to censure specific component.Affiliated neck
Has usually intellectual in domain, it is to be appreciated that hardware manufacturer may call the same component with different nouns.This theory
Bright book and following claims are not in such a way that the difference of title is used as and distinguishes component, but functionally with component
Difference be used as the criterion of differentiation.It is an opening in the "comprising" system of specification in the whole text and subsequent claims mentioned in
The term of formula, therefore should be construed to " including but not limited to ".In addition, " coupling " word is comprising any directly and indirect herein
Electrical connection, therefore, if it is described herein that a first device is coupled to a second device, then representing the first device can be direct
It is electrically connected in the second device, or is electrically connected indirectly to the second device through other devices or connection means.
Fig. 1 systems are according to the schematic diagram of the impedance matching circuit 100 of one embodiment of the invention, as shown in Figure 1, impedance matching is electric
Road 100 includes a transmitting circuit 110, a variable impedance circuit 120, a generating circuit from reference voltage 130, a control circuit 140,
And impedance matching circuit 100 is coupled to an impedance 10, in one embodiment, impedance matching circuit through an output contact OUT
100 can be set in an integrated circuit (Integrated Circuit, IC), and output contact OUT can be an output pad
(pad), in addition, 10 system of impedance is set to outside the integrated circuit and from the equiva lent impedance that output contact OUT is regarded, impedance 10 can
Include the impedance of a transformer, a transmission line and another integrated circuit, however, this is only example explanation, and non-present invention
A limitation, in other embodiments, impedance matching circuit 100 and impedance 10 can be the electricity being set in same integrated circuit
Road block.In one embodiment, transmitting circuit 110 can be the transmission line driver mentioned in prior art, to provide electricity
Driving impedance 10 is flowed, however in other embodiments, transmitting circuit 110 can be other circuit units for providing electric current, voltage,
One limitation of this and non-present invention.Although it is noted that only describing one group of variable impedance circuit, reference voltage production in Fig. 1
Raw circuit and control circuit, however, those skilled in the art, which should be able to be readily appreciated that equally, can another group of impedance
Another output end of transmitting circuit 110 is set to circuit.In this embodiment, transmitting circuit 110 penetrates an input endpoint IN
There is provided an input voltage VIN to variable impedance circuit 120 and generating circuit from reference voltage 130 makes generating circuit from reference voltage 130
A reference voltage VREF is generated according to input voltage VIN, and control circuit 140 receives the output voltage on exit point OUT
VOUT and reference voltage VREF is to generate a control signal CTRL to variable impedance circuit 120 to change variable impedance circuit
120 impedance value so that the impedance value is matched with impedance 10.
Generating circuit from reference voltage 130 and control circuit 140 in the impedance matching circuit 100 of Fig. 2 systems according to Fig. 1
Schematic diagram, as shown in Fig. 2, generating circuit from reference voltage 130 may include the resistor voltage divider circuit with two resistance R with according to defeated
Enter voltage VIN execute an electric resistance partial pressure operation generate reference voltage VREF, control circuit 140 include a comparator 141 and
One correcting circuit 142, wherein correcting circuit 142 can be a digital circuit, receive a frequency signal CLK and controlled with lasting generation
Signal CTRL processed makes the impedance value of variable impedance circuit 120 change from large to small or from small to large to variable impedance circuit 120,
Wherein control signal CTRL can be a digital signal, and the value of the digital signal is passed with each frequency in frequency signal CLK
Increase or successively decrease, the impedance value of variable impedance circuit 120 is made to increase or decrease accordingly, however, this is only example explanation, not originally
One embodiment of invention, the present invention are not intended to limit correcting circuit 142 and control the embodiment of signal CTRL, in other words,
As long as the impedance value of variable impedance circuit 120 can be made to be risen or fallen with control signal CTRL, it should all be under the jurisdiction of the model of the present invention
Farmland；141 system of comparator is extremely corrected to compare output voltage VO UT and reference voltage VREF with generating a trigger signal TRIG
Circuit 142.Specifically, produced by being operated by electric resistance partial pressure due to reference voltage VREF, it should be the one of input voltage VIN
Half (i.e. VREF=VIN/2), and when the impedance value of variable impedance circuit 120 is according to control signal CTRL increasing or decreasings, it is defeated
Going out voltage VOUT can also change correspondingly, and when output voltage VO UT is identical as reference voltage VREF, represent variable impedance at this time
The impedance value of circuit 120 is impedance matching with impedance 10, and therefore trigger signal TRIG transition (can be changed by logical value 1 and be patrolled
Collect value 0 or logical value 1 be changed by logical value 0), last correcting circuit 142 records at that time according to the transition of trigger signal TRIG
Impedance value, and control variable impedance circuit 120 impedance value be impedance matching occur when impedance value.
The schematic diagram of the variable impedance circuit 120 of the impedance matching circuit 100 of Fig. 3 systems according to Fig. 1, as shown in figure 3,
Variable impedance circuit 120 includes an electric resistance array, and wherein the electric resistance array includes multiple resistance R0-RnAnd opposite switch
SW1-SWn, when the value for controlling signal CTRL is incremented by from small to large with the frequency of frequency signal CLK, switch SW1-SWnAlso sequentially
It closes so that resistance R0More resistance in parallel in other words, can variable resistance when the value for controlling signal CTRL is incremented by from small to large
The impedance value of reactive circuit 120 can be by big and small variation, it should be noted that, this is only example explanation, an and limit of non-present invention
System, in other embodiments, when the value for controlling signal CTRL is incremented by from small to large, the impedance value of variable impedance circuit 120 is also
It can change from small to large；In addition, the present invention does not limit the embodiment of electric resistance array, those skilled in the art should be able to be light
The other embodiment of readily understood electric resistance array, as long as the impedance value of variable impedance circuit 120 can be made on control signal CTRL
It rises or declines, should all be under the jurisdiction of scope of the invention.
Fig. 4 systems are illustrated according to the variation of the trigger signal TRIG of one embodiment of the invention and the impedance value of variable impedance circuit
Figure, with reference to figure 4, when the value for controlling signal CTRL rises with the frequency of frequency signal CLK, variable impedance circuit 120
Impedance value is because of resistance R0Other resistance sequentially in parallel and change from large to small, cause output voltage VO UT from small to large be incremented by,
When the impedance value of variable impedance circuit 120 is RxWhen with 10 impedance matching of impedance, trigger signal CTRL can be changed by logical value 0
Logical value 1, at this time control circuit 140 record impedance value Rx；Similarly, the value of control signal CTRL is with frequency signal CLK's
Frequency and when declining, the impedance value of variable impedance circuit 120 causes output electricity because switch is sequentially opened and changed from small to large
VOUT is pressed to be incremented by from large to small, when the impedance value of variable impedance circuit 120 is RyWhen with 10 impedance matching of impedance, trigger signal
CTRL can be changed into logical value 0 by logical value 1, and control circuit 140 records impedance value R at this timeyIf impedance value RxNot equal to impedance
Value Ry, control circuit 140 can judge which impedance value is selected relatively to match with the impedance of impedance 10, to select impedance value Rx、RyIts
One of be used as the setting value of variable impedance circuit 120.Although it is noted that in this present embodiment, controlling signal CTRL
Change from large to small again from small to large, but this is only example explanation, in other embodiments, control signal CTRL also can only do one
Secondary variation, also that is, variation only from small to large or from large to small and only recording an impedance value.
Simple to conclude the present invention, the present invention proposes an impedance matching circuit, comes through the voltage before and after acquisition impedance circuit
Control signal is generated, and variable impedance circuit is sent to change its impedance value, according to frame proposed by the invention through feedback
Structure dynamically reaches impedance matching with the transmission line outside integrated circuit, and unnecessary power disappears when to avoid impedance mismatch
Consumption.
The foregoing is merely the preferred embodiments of the invention, all equivalent changes done according to the claims in the present invention with repair
Decorations, should all belong to the covering scope of the present invention.
【Symbol description】
100 impedance matching circuits
110 transmitting circuits
120 variable impedance circuits
130 generating circuit from reference voltage
140 control circuits
10 impedances
The input endpoints IN
OUT exit points
VIN input voltages
VOUT output voltages
VREF reference voltages
CTRL controls signal
R、R0-RnResistance
TRIG trigger signals
CLK frequency signals
141 comparators
142 correcting circuits
SW1-SWnSwitch
Claims (10)
1. a kind of impedance matching circuit, including：
One variable impedance circuit, to be coupled to an impedance, wherein the variable impedance circuit includes a variable impedance；
One generating circuit from reference voltage is coupled to the variable impedance circuit, and the wherein generating circuit from reference voltage system is receiving
One input voltage of the variable impedance circuit is to generate a reference voltage；And
One control circuit is coupled to the variable impedance circuit, wherein the control circuit system to according to the reference voltage and should
One output voltage of variable impedance circuit generates a control signal to control the variable impedance, makes the variable impedance and the impedance
Matching.
2. impedance matching circuit according to claim 1, the wherein reference voltage are the half of the input voltage, and working as should
When reference voltage is equal to the output voltage, which is to match with the impedance.
3. according to the impedance matching circuit of claim 2, wherein the control circuit includes：
One comparator, to compare the output voltage and the reference voltage to generate a trigger signal；And
One correcting circuit, according to the trigger signal, which controls the variable impedance through the control signal-selectivity
Change from large to small or from small to large.
4. impedance matching circuit according to claim 3, the wherein correcting circuit control this through the control signal and can be changed
Impedance makes the variable impedance have the matching resistance when the trigger signal is changed into second logical value from one first logical value
Anti- value.
5. impedance matching circuit according to claim 2, the wherein generating circuit from reference voltage include：
One resistor voltage divider circuit, to execute electric resistance partial pressure operation to the input voltage to generate the reference voltage.
6. impedance matching circuit according to claim 2, the wherein variable impedance include an electric resistance array, the electric resistance array
Including multiple resistance being arranged in parallel and multiple corresponding switches, and through the control signal to change this more for the control circuit
The state of a corresponding switch is to change a resistance value of the variable impedance.
7. impedance matching circuit according to claim 1, the wherein impedance are set to one comprising the impedance matching circuit
Except integrated circuit.
8. impedance matching circuit according to claim 7, the wherein input voltage of the variable impedance circuit are passed from one
Device is sent, the output voltage of the variable impedance circuit is sent to the impedance, and the resistance through one contact/pin of the integrated circuit
Anti- includes a transmission line impedance.
9. a kind of integrated circuit, including：
One impedance matching circuit, the wherein impedance matching circuit include：
One variable impedance circuit, to be coupled to an impedance, wherein the variable impedance circuit includes a variable impedance；
One generating circuit from reference voltage is coupled to the variable impedance circuit, and the wherein generating circuit from reference voltage system is receiving
One input voltage of the variable impedance circuit is to generate a reference voltage；And
One control circuit is coupled to the variable impedance circuit, wherein the control circuit system to according to the reference voltage and should
One output voltage of variable impedance circuit generates a control signal to control the variable impedance, makes the variable impedance and the impedance
Matching,
Wherein the impedance is set to except the integrated circuit, and the impedance includes a transmission line impedance.
10. integrated circuit according to claim 9, the wherein reference voltage are the half of the input voltage, and work as the ginseng
When examining voltage and being equal to the output voltage, which is to match with the impedance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710061668.0A CN108365832B (en) | 2017-01-26 | 2017-01-26 | Impedance matching circuit and integrated circuit using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710061668.0A CN108365832B (en) | 2017-01-26 | 2017-01-26 | Impedance matching circuit and integrated circuit using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108365832A true CN108365832A (en) | 2018-08-03 |
| CN108365832B CN108365832B (en) | 2021-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710061668.0A Active CN108365832B (en) | 2017-01-26 | 2017-01-26 | Impedance matching circuit and integrated circuit using the same |
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| Country | Link |
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| CN (1) | CN108365832B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114385535A (en) * | 2021-12-06 | 2022-04-22 | 裕太微电子股份有限公司 | Adaptive impedance matching circuit of PHY chip and working method thereof |
| CN117424575A (en) * | 2023-12-18 | 2024-01-19 | 深圳市瀚强科技股份有限公司 | Radio frequency circuit, radio frequency power supply equipment and reactance compensation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114385535A (en) * | 2021-12-06 | 2022-04-22 | 裕太微电子股份有限公司 | Adaptive impedance matching circuit of PHY chip and working method thereof |
| CN117424575A (en) * | 2023-12-18 | 2024-01-19 | 深圳市瀚强科技股份有限公司 | Radio frequency circuit, radio frequency power supply equipment and reactance compensation method |
| CN117424575B (en) * | 2023-12-18 | 2024-04-09 | 深圳市瀚强科技股份有限公司 | Radio frequency circuit, radio frequency power supply equipment and reactance compensation method |
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| Publication number | Publication date |
|---|---|
| CN108365832B (en) | 2021-08-20 |
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