CN2081172U - Impedance transformer - Google Patents
Impedance transformer Download PDFInfo
- Publication number
- CN2081172U CN2081172U CN 90206524 CN90206524U CN2081172U CN 2081172 U CN2081172 U CN 2081172U CN 90206524 CN90206524 CN 90206524 CN 90206524 U CN90206524 U CN 90206524U CN 2081172 U CN2081172 U CN 2081172U
- Authority
- CN
- China
- Prior art keywords
- operational amplifier
- impedance transformer
- differential amplifier
- amplifier
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model provides a new AC amplifier or a new AC impedance transformer which have high input impedance and low output impedance. The utility model is composed of an operational amplifier or a difference amplifier, a bipolar transistor or a field effect transistor, six resistors and three capacitors. The utility model has only three terminals, a signal input terminal, a signal output terminal and a common port. The utility model has no single terminal for singly supplying power supply, and the output signal of the utility model is led out from the power source input terminal of the operational amplifier or the difference amplifier. In instruments and meters or in the technologies of terrestrial or marine seismic prospecting, environmental science and vibration measurement, the utility model can widely serve as the output circuit of the sensor which has high output resistance.
Description
The utility model relate to have high input impedance, the AC amplifier of low output impedance, it is made up of operational amplifier or differential amplifier, bipolar transistor or field-effect transistor, resistor, capacitor.
So far, the AC impedance converter with high input impedance, low output impedance that constitutes with operational amplifier needs the terminals of independent supply power.Fig. 1 and Fig. 2 are the typical circuits with the impedance transformer of operational amplifier formation.Impedance transformer shown in Figure 1 needs independent positive voltage source terminals and negative voltage source terminals, and together with signal input part, signal output part and common port, one has five terminals.Impedance transformer shown in Figure 2 needs independent positive supply terminals, and together with signal input part, signal output part and common port, one has four terminals.
Impedance transformer is commonly used for piezoelectric acceleration sensor, this class of piezoelectric pressure indicator has the very output circuit of the transducer of high output impedance, sends the signal of sensor measurement to input impedance lower secondary meter.Be connected, need four or three connecting lines between impedance transformer and the secondary meter with coaxial cable between transducer and the impedance transformer.In order to reduce the influence of the connecting line between transducer and the secondary meter, usually be installed in impedance transformer and transducer in the housing or impedance transformer be contained in the transducer that becomes the band impedance transformer in the housing of transducer.Need four or three ties between the transducer of this band impedance transformer and the secondary meter, can not connect with coaxial cable.When multimetering, the quantity that reduces the connecting line between transducer and the secondary meter is highly significant.
The purpose of this utility model provides a kind of AC impedance converter, and it constitutes with operational amplifier or differential amplifier but does not need the terminals of independent supply power, and it has only three terminals is signal input part, signal output part and common port.Be connected with coaxial cable between the impedance transformer that the utility model provides and the transducer, only need two connecting lines between it and the secondary meter, therefore can connect with coaxial cable.The impedance transformer that provides with the utility model is contained in the housing with aforesaid transducer with high output impedance or is contained in the housing of transducer and becomes as a whole.Have only two connecting lines between the transducer of this band impedance transformer and the secondary meter, thereby can use coaxial cable to connect.
Fig. 1 and Fig. 2 are the circuit diagrams of the existing impedance transformer that constitutes with operational amplifier.
Fig. 3 is the circuit diagram of the impedance transformer that provides of the utility model.
Fig. 4 is an embodiment who uses the impedance transformer that the utility model provides.
The impedance transformer as shown in Figure 3 100 that the utility model provides is by operational amplifier or differential amplifier A, bipolar transistor T, resistor R
1, R
2, R
3, R
4, R
5, R
6And capacitor C
1, C
2, C
3Form, it is characterized in that: the output 3 of operational amplifier or differential amplifier A is received inverting input 1, electricity consumption container C between the base stage 7 of output 3 and bipolar transistor T
3Connect, use resistor R between the base stage 7 of bipolar transistor T and the collector electrode 8
6Connect.The emitter 6 of bipolar transistor T is connected with the positive supply input 4 of operational amplifier or differential amplifier A, the collector electrode 8 of bipolar transistor T is connected with the negative supply input 5 of operational amplifier or differential amplifier A, uses resistor R between the positive supply input 4 of operational amplifier or differential amplifier A and the negative supply input 5
4And R
5Connect electricity consumption container C between the in-phase input end 2 of the input a of impedance transformer 100 and operational amplifier or differential amplifier A
1And resistor R
1Connect, use resistor R between contact 9 and the contact 11
2, R
3Connect electricity consumption container C between the output 3 of operational amplifier or differential amplifier and the contact 10
2Connect.The output signal of the impedance transformer 100 that the utility model provides is drawn from the positive supply input 4 of operational amplifier or differential amplifier.The negative supply input 5 that the positive supply input 4 of operational amplifier or differential amplifier is directly linked output b, operational amplifier or the differential amplifier A of impedance transformer meets the common port c of impedance transformer 100.The impedance transformer 100 that the utility model provides does not have the terminals of independent supply power, and it has only three terminals is signal input part a, signal output part b and common port c.
When the impedance transformer that enforcement the utility model provides, resistor R
6Can change into and capacitor C
3In parallel.
When the impedance transformer that enforcement the utility model provides, the output 3 of operational amplifier or differential amplifier A can directly link to each other with the base stage 7 of bipolar transistor T, and at this moment the emitter 6 of bipolar transistor T is received the positive supply input 4 of described operational amplifier through a voltage stabilizing didoe.
When the impedance transformer that enforcement the utility model provides, can replace bipolar transistor with the field-effect transistor of suitably biasing.
Fig. 4 provides an example using the impedance transformer that the utility model provides.The impedance transformer 100 that having the piezoelectric acceleration sensor of high output impedance or piezoelectric pressure indicator 200 and the utility model provides is contained in the transducer 300 that becomes the band impedance transformer in the housing.Two outputs of transducer 200 are received the input a and the common port c of impedance transformer 100 respectively, the transducer 300 of band impedance transformer has only two terminals, and its signal output part b and common port c(are exactly the signal output part and the common port of impedance transformer 100 simultaneously) receive 13 ends and the lower AC amplifier A of input impedance of the constant-current source L in the secondary meter 500 respectively with coaxial cable 400
1 Common port 15,13 ends of constant-current source L and the lower AC amplifier A of input impedance
1Input 14 between by capacitor C
4Connect the 12 termination voltage source E of constant-current source L
C
Compare with impedance transformer existing, that consist of with operational amplifier, the advantage of the impedance transformer that the utility model provides is the connecting line that it does not need independent supply power, it only has three terminals is signal input part, signal output part and common port, and another advantage of the resistance parallel operation that the utility model provides is that the DC potential of its output b is not subjected to voltage source ECThe impact that changes, the alternating current output signal of impedance transformer is not subjected to voltage source E yetCThe impact that changes.
The AC impedance converter that the utility model provides can be widely used as the output circuit of transducer with high output impedance such as piezoelectric acceleration sensor, piezoelectric pressure indicator, capacitance sensor in instrument and meter, land and offshore seismic exploration, environmental science, vibration measurement technique.
Claims (7)
1, by an operational amplifier or differential amplifier A, a bipolar transistor T, six resistor R
1, R
2, R
3, R
4, R
5, R
6With three capacitor C
1, C
2, C
3The AC impedance converter of forming is characterized in that the output 3 of operational amplifier or differential amplifier A is received inverting input 1, electricity consumption container C between the base stage 7 of output 3 and bipolar transistor T
3Connect, the emitter 6 of bipolar transistor T is connected with the positive power source terminal 4 of operational amplifier or differential amplifier A, the collector electrode 8 of bipolar transistor T is connected with the negative supply input 5 of operational amplifier or differential amplifier A, uses resistor R between the base stage 7 of bipolar transistor T and the collector electrode 8
6Connect; Use resistor R between the positive supply input 4 of operational amplifier or differential amplifier A and the negative supply input 5
4And R
5Connection, the in-phase input end 2 of the signal input terminal of impedance transformer and operational amplifier or differential amplifier A is by capacitor C
1And resistor R
1Connect C
1And R
1Contact 9 and R
4And R
5Contact 11 between use resistor R
2And R
3Connect output 3 and the R of operational amplifier or differential amplifier A
2And R
3Contact 10 between the electricity consumption container C
2Connect; The output signal of impedance transformer is drawn from the positive supply input 4 of operational amplifier or differential amplifier and is received signal output part b, and the common port c of impedance transformer draws from the negative power end 5 of operational amplifier or differential amplifier.
2, impedance transformer according to claim 1 is characterized in that constituting with operational amplifier or differential amplifier.
3, impedance transformer according to claim 1 is characterized in that utilizing operational amplifier or the differential amplifier input stage as impedance transformer.
4, impedance transformer according to claim 1 is characterized in that the output of operational amplifier or differential amplifier passes through the power input that bipolar transistor is received this operational amplifier or differential amplifier.
5, impedance transformer according to claim 1 is characterized in that its output signal is drawn from the power input of operational amplifier or differential amplifier.
6, impedance transformer according to claim 1 is characterized in that it does not have the terminals of independent supply power, and it has only signal input part a, signal output part b and common port c.
7, the impedance transformer according to claim 1 emitter that comprises bipolar transistor through voltage stabilizing didoe receive the power input of operational amplifier the distortion circuit, comprise operational amplifier output through a voltage stabilizing didoe receive the power input of this operational amplifier the distortion circuit, comprise the distortion circuit that saves certain resistor or certain capacitor, comprise the distortion circuit that replaces bipolar transistor with the field-effect transistor of suitably biasing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90206524 CN2081172U (en) | 1990-05-19 | 1990-05-19 | Impedance transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90206524 CN2081172U (en) | 1990-05-19 | 1990-05-19 | Impedance transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2081172U true CN2081172U (en) | 1991-07-17 |
Family
ID=4887097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90206524 Withdrawn CN2081172U (en) | 1990-05-19 | 1990-05-19 | Impedance transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2081172U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110644530A (en) * | 2019-09-11 | 2020-01-03 | 海门市帕源路桥建设有限公司 | Automatic adjusting device for height and level of internal mold |
-
1990
- 1990-05-19 CN CN 90206524 patent/CN2081172U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110644530A (en) * | 2019-09-11 | 2020-01-03 | 海门市帕源路桥建设有限公司 | Automatic adjusting device for height and level of internal mold |
| CN110644530B (en) * | 2019-09-11 | 2021-05-07 | 海门市帕源路桥建设有限公司 | Automatic adjusting device for height and level of internal mold |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |