CN100539409C - Output impedance control circuit device and control method thereof and output-stage circuit device - Google Patents
Output impedance control circuit device and control method thereof and output-stage circuit device Download PDFInfo
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- CN100539409C CN100539409C CNB2004100041506A CN200410004150A CN100539409C CN 100539409 C CN100539409 C CN 100539409C CN B2004100041506 A CNB2004100041506 A CN B2004100041506A CN 200410004150 A CN200410004150 A CN 200410004150A CN 100539409 C CN100539409 C CN 100539409C
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- 230000000052 comparative effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 5
- 238000003491 array Methods 0.000 description 3
- 239000011469 building brick Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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Abstract
The invention provides a kind of output impedance control circuit and method thereof.This impedance Control device is in order to adjust a resistance value of an output-stage circuit, and this output-stage circuit has one first output and one second output, and this device comprises a detecting unit, in order to export this first and a direct current current potential of this second output; And a control unit, adjust this resistance value of this output-stage circuit according to this DC potential and a reference voltage.
Description
Technical field
The present invention is meant the output-stage circuit with adjustable output impedance especially about a kind of output-stage circuit.
Background technology
In the method for the resistance value of known adjustment output-stage circuit, adjust resistance value no matter use the analog or digital mode, all be to duplicate portion in the loop and want the impedance circuit adjusted in independently adjusting, utilize and adjust the loop correcting controlling signal, again control signal is passed in the real output-stage circuit, to obtain correct output impedance.
See also Fig. 1, Fig. 1 is the known schematic diagram of adjusting the output-stage circuit 65 of output impedance.Output-stage circuit 65 comprises two identical electric resistance arrays (resistor array) 66,67.Adjusted loop by utilization to form one with the electric resistance array 68 of electric resistance array 66,67 identical duplicating (Replica) for one.Utilize the voltage and a reference voltage of this circuit that duplicates electric resistance array 68 to compare, produce a control signal by control logic 70 then,, obtain correct resistance value to adjust the output impedance of output-stage circuit 65.
Because the difference on the electronic building brick processing procedure makes the drift of circuit unit resistance value, therefore can't copy identical circuit, influence the accuracy of output impedance.Because use more assembly, can cause the unnecessary current loss of circuit arrangement, and cost is higher in addition.
Summary of the invention
One of purpose of the present invention provides a kind of output impedance control circuit and method thereof, can increase the accuracy of the output impedance of output-stage circuit.
A kind of output impedance control circuit of the present invention.This impedance Control device is in order to adjust a resistance value of an output-stage circuit, and this output-stage circuit has one first output and one second output, and this device comprises a detecting unit, in order to export this first and a direct current current potential of this second output; And a control unit, adjust this resistance value of this output-stage circuit according to this DC potential and a reference voltage.
A kind of output impedance control method of the present invention.This method is in order to control a resistance value of an output-stage circuit, and this output-stage circuit comprises one first output and one second output, and this method comprises the following step: a direct current current potential that detects this first output and this second output; Relatively this direct voltage and a reference voltage produce a comparison signal; And this resistance value of adjusting this output-stage circuit according to this comparison signal.
Can be further understood via the following detailed description and accompanying drawings about the advantages and spirit of the present invention.
Description of drawings
Fig. 1 is the output-stage circuit schematic diagram of known control output impedance.
Fig. 2 is the schematic diagram of the output-stage circuit of output impedance control of the present invention.
Fig. 3 is the method flow diagram of output impedance control of the present invention.
The drawing reference numeral explanation
10,65: output-stage circuit 66,67: electric resistance array
10: 11: the first electric resistance arrays of output-stage circuit
14: the first resistance of 12: the first outputs
Switch 20 in 18: the first: node
22: the second outputs of 21: the second electric resistance arrays
28: second switch 30: reference current source
32: control unit 34: comparator
36: control logic 68: the electric resistance array that duplicates
Embodiment
See also Fig. 2, Fig. 2 is the schematic diagram of an adjustable output impedance device of the present invention and an output-stage circuit 10.This output-stage circuit 10 comprises a reference current source 30, first and second switch 18 and 28, first and second electric resistance array 11,21.This output-stage circuit 10 has one first output stage 12 and one second output stage 22.This is adjustable, and the output impedance device comprises a detecting unit 26 and a control unit 32.This detecting unit 26 is coupled between this first output stage 12 and this second output stage 22, and exports direct current (DC) current potential of the output signal of this output-stage circuit.This control unit 32 is coupled to this detecting unit 26, and accept this direct voltage and a reference voltage, and according to this direct voltage and this reference voltage, in order to the electric resistance array 11 of adjusting this output- stage circuit 10,21, to reach the output impedance of adjusting this output-stage circuit 10.
In preferred embodiment, this detecting unit 26 can comprise that one first resistance 14 is connected with one second resistance 24 and form a node 20, and be coupled between this first output stage 12 and this second output stage 22.The resistance value of first resistance 14 is identical with the resistance value of second resistance 24, and greater than the resistance value of output-stage circuit 10.Direct current (DC) current potential of the output signal of these node 20 these output-stage circuits of output.
In preferred embodiment, this control unit 32 can comprise a comparator 34 and a control logic 36.Comparator 34 is in order to detecting a direct current voltage of this first resistance 14 and a node 20 of this second resistance 24, and receives a reference voltage.Comparator 34 and the potential difference between direct voltage and the reference voltage 32 relatively, and respond this potential difference and export a comparison signal.Control logic 36 is corresponding to this comparison signal, in order to producing this control signal, and exports this respectively and controls signal to first and second electric resistance array 11,21.Adjust an impedance matching of first electric resistance array 11 and second electric resistance array 21 and external environment condition by this.In preferred embodiment, an execution mode of this comparator 34 can be an operational amplifier; One execution mode of this control logic 36 can be a counter.
See also Fig. 3, Fig. 3 is the flow chart of the control method of the adjustable output impedance of the present invention.And utilize the output-stage circuit 10 of Fig. 2 to be illustrated.This method comprises the following step:
S42: a direct current voltage that detects one first output stage 12 and one second output stage 22;
S44:, produce a comparison signal according to this direct voltage and a reference voltage;
S46:, adjust this first electric resistance array 11 and this second electric resistance array 21 according to comparison signal.
In the above description, no matter be this first and this second switch 18,28 all applicable for state or the state of only opening a switch all opened.
The output-stage circuit of a kind of output impedance control of the present invention, only need utilize output-stage circuit itself is may command output impedance, obtains the output impedance with the external impedance coupling.Can save circuit and reduce current loss, also relatively reduce cost.
Via the above detailed description of preferred embodiments, hope can be known description feature of the present invention and spirit more, and is not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that scheme that hope can contain various changes and have an equivalence is in the category of the claim of institute of the present invention desire application.Therefore, the category of the claim that the present invention applied for should be done the broadest explanation according to above-mentioned explanation, with the scheme that causes it to contain all possible change and have equivalence.
Claims (7)
1. impedance Control device, in order to adjust a resistance value of an output-stage circuit, this output-stage circuit has one first output and one second output, and this device comprises:
One detecting unit, has one first resistance, one end of this first resistance couples mutually with this first output, and one second resistance, one end of this second resistance and this second output couple, the other end of the other end of this second resistance and this first resistance couples and forms a node, exports a direct current current potential from this node, and this DC potential is corresponding with this resistance value;
One control unit according to this DC potential and a reference voltage, is exported a control signal, and adjusts this resistance value of this output-stage circuit according to this control signal.
2. impedance Control device as claimed in claim 1, wherein control unit comprises:
One comparator receives this DC potential and this reference voltage, exports a comparative result; And
One control logic is exported this control signal according to this comparative result.
3. impedance Control device as claimed in claim 2, wherein the resistance value of this first resistance is identical with the resistance value of this second resistance.
4. impedance Control device as claimed in claim 2, wherein this first with the resistance value of this second resistance this resistance value greater than this output-stage circuit.
5. a method is in order to control a resistance value of an output-stage circuit, and this output-stage circuit comprises one first output and one second output, and this method comprises the following step:
Detect a direct current current potential of this first output and this second output, this DC potential is exported from the node that the end series connection by end of one first resistance and one second resistance forms, the other end of the other end of this first resistance and second resistance be respectively coupled to this first and this second output;
Relatively this DC potential and a reference voltage produce a comparison signal; And
Adjust this resistance value of this output-stage circuit according to this comparison signal.
6. output-stage circuit device, this device comprises:
One output-stage circuit has one first output and one second output, and in order to export an output signal, this output-stage circuit has an output impedance;
One detecting unit, has one first resistance, one end of this first resistance couples mutually with this first output, and one second resistance, one end of this second resistance and this second output couple, the other end of the other end of this second resistance and this first resistance couples and forms a node, and this detecting unit is in order to detect from a direct current current potential of this node output;
One control unit according to this DC potential and a reference voltage, is exported a control signal, and adjusts this output impedance of this output-stage circuit according to this control signal.
7. device as claimed in claim 6, wherein the resistance value of this first resistance is identical with the resistance value of this second resistance, and greater than this output impedance of this output-stage circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100041506A CN100539409C (en) | 2004-02-13 | 2004-02-13 | Output impedance control circuit device and control method thereof and output-stage circuit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100041506A CN100539409C (en) | 2004-02-13 | 2004-02-13 | Output impedance control circuit device and control method thereof and output-stage circuit device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1655448A CN1655448A (en) | 2005-08-17 |
| CN100539409C true CN100539409C (en) | 2009-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100041506A Expired - Lifetime CN100539409C (en) | 2004-02-13 | 2004-02-13 | Output impedance control circuit device and control method thereof and output-stage circuit device |
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| CN (1) | CN100539409C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI456205B (en) * | 2012-11-27 | 2014-10-11 | Cyrustek Co | Method and apparatus of range selection in auto-balancing bridge |
| TWI475372B (en) * | 2012-05-15 | 2015-03-01 | Acer Inc | Power manage apparatus and power managing method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684347B (en) * | 2012-09-11 | 2016-07-06 | 瑞昱半导体股份有限公司 | Adjustable impedance circuit and impedance setting method |
| CN103837727B (en) * | 2012-11-27 | 2016-05-25 | 承永资讯科技股份有限公司 | The system of selection of self-balancing bridge circuit gear and device |
| CN107390762B (en) * | 2017-08-25 | 2019-05-28 | 华大半导体有限公司 | The circuit for regulating and controlling and regulation method of the stability of passive device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5254956A (en) * | 1991-05-29 | 1993-10-19 | Nec Corporation | Composite differential amplifier |
| CN1291821A (en) * | 1999-09-01 | 2001-04-18 | 英特赛尔公司 | Current mode DC/DC inverter possessing controllable output impedance |
| US6333623B1 (en) * | 2000-10-30 | 2001-12-25 | Texas Instruments Incorporated | Complementary follower output stage circuitry and method for low dropout voltage regulator |
| US20020063575A1 (en) * | 2000-11-30 | 2002-05-30 | Samsung Electronics Co., Ltd. | Impedance control circuit |
| US20030151461A1 (en) * | 2002-02-12 | 2003-08-14 | Hitachi, Ltd. | Automatic gain adjustment circuit and amplifier using the same |
-
2004
- 2004-02-13 CN CNB2004100041506A patent/CN100539409C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5254956A (en) * | 1991-05-29 | 1993-10-19 | Nec Corporation | Composite differential amplifier |
| CN1291821A (en) * | 1999-09-01 | 2001-04-18 | 英特赛尔公司 | Current mode DC/DC inverter possessing controllable output impedance |
| US6333623B1 (en) * | 2000-10-30 | 2001-12-25 | Texas Instruments Incorporated | Complementary follower output stage circuitry and method for low dropout voltage regulator |
| US20020063575A1 (en) * | 2000-11-30 | 2002-05-30 | Samsung Electronics Co., Ltd. | Impedance control circuit |
| US20030151461A1 (en) * | 2002-02-12 | 2003-08-14 | Hitachi, Ltd. | Automatic gain adjustment circuit and amplifier using the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI475372B (en) * | 2012-05-15 | 2015-03-01 | Acer Inc | Power manage apparatus and power managing method thereof |
| TWI456205B (en) * | 2012-11-27 | 2014-10-11 | Cyrustek Co | Method and apparatus of range selection in auto-balancing bridge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1655448A (en) | 2005-08-17 |
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