CN1045901A - Novel impedance transformer - Google Patents
Novel impedance transformer Download PDFInfo
- Publication number
- CN1045901A CN1045901A CN 90103534 CN90103534A CN1045901A CN 1045901 A CN1045901 A CN 1045901A CN 90103534 CN90103534 CN 90103534 CN 90103534 A CN90103534 A CN 90103534A CN 1045901 A CN1045901 A CN 1045901A
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- CN
- China
- Prior art keywords
- operational amplifier
- differential amplifier
- impedance transformer
- amplifier
- input
- 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 invention provides a kind of new high input impedance that has, the AC amplifier of low output impedance or AC impedance converter, it is by an operational amplifier or differential amplifier, bipolar transistor or field effect transistor, pipe, a voltage stabilizing didoe, five resistors and two electric capacity are formed, it does not have the terminals of independent supply power, it has only three wiring is signal input part, signal output part and common port, its output signal is drawn from the power input of operational amplifier or differential amplifier, can be at instrument and meter, land and offshore seismic exploration, environmental science, can be widely used as the output circuit of transducer in the vibration measurement technique with high output impedance.
Description
The present invention relates to have high input impedance, the AC amplifier of low output impedance, it is made up of operational amplifier or differential amplifier, polarized lense pipe or field effect transistor, voltage stabilizing didoe, resistor, capacitor.
Up to now, 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 invention is to provide a kind of AC impedance converter, 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 impedance transformer provided by the invention and the transducer, only need two connecting lines between it and the secondary meter, therefore can connect with coaxial cable.Be contained in the housing or be contained in the housing of transducer with impedance transformer provided by the invention and aforesaid transducer and become as a whole with high output impedance.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 impedance transformer provided by the invention.
Fig. 4 is another embodiment of impedance transformer provided by the invention.
Fig. 5 is the 3rd embodiment of impedance transformer provided by the invention.
Fig. 6 is the 4th embodiment of impedance transformer provided by the invention.
Fig. 7 is an embodiment who uses impedance transformer provided by the invention.
Fig. 4 is another embodiment of impedance transformer provided by the invention.Field-effect transistors replaces bipolar transistor in this example.
Fig. 5 is the 3rd embodiment of impedance transformer provided by the invention.Use capacitor C between the output 3 of operational amplifier in this example (or differential amplifier) A and the base stage 7 of bipolar transistor T
3Connect termination resistor R between base stage 7 and the collector electrode 8
6(perhaps resistor R
6Be connected in parallel on capacitor C
3On), the emitter 6 of bipolar transistor T directly is connected with the positive supply input 4 of operational amplifier or differential amplifier A.
Fig. 6 is the 4th embodiment of impedance transformer provided by the invention.Be connected with voltage stabilizing didoe D between the output 3 of operational amplifier in this example (or differential amplifier) A and the positive supply input 4, output 3 and the negative supply input 5 of operational amplifier or differential amplifier A are used resistor R
7Connect.
Fig. 7 provides an example using impedance transformer provided by the invention.Has the piezoelectric acceleration sensor of high output impedance or piezoelectric pressure indicator 200 and impedance transformer provided by the invention 100 are contained in becomes the band impedance transformer in the housing transducer 300.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 impedance transformer provided by the invention 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 impedance transformer provided by the invention 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.
AC impedance converter provided by the invention 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, a voltage stabilizing didoe, five resistor R
1, R
2, R
3, R
4, R
5With two capacitor C
1, C
2The AC impedance converter of forming, it is characterized in that the output 3 of operational amplifier or differential amplifier A receives the base stage 7 of inverting input 1 and bipolar transistor T, the emitter 6 of bipolar transistor T is connected by voltage stabilizing didoe D with the positive power source terminal 4 of operational amplifier or differential amplifier A, and the collector electrode 8 of bipolar transistor T is connected with the negative supply input 5 of operational amplifier or differential amplifier A.Use resistor R between the positive supply input 4 of operational amplifier or differential amplifier A and the negative supply input 5
4And R
5Connect, the in-phase input end 2 of the signal input part a 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 by 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 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 or field-effect transistor or voltage stabilizing didoe are 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, impedance transformer according to claim 1 comprises the distortion circuit that saves bipolar transistor, voltage stabilizing didoe or certain resistor or certain capacitor, comprises that field-effect transistors replaces the distortion circuit of bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90103534 CN1012875B (en) | 1990-05-19 | 1990-05-19 | Impedance converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90103534 CN1012875B (en) | 1990-05-19 | 1990-05-19 | Impedance converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1045901A true CN1045901A (en) | 1990-10-03 |
| CN1012875B CN1012875B (en) | 1991-06-12 |
Family
ID=4878127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90103534 Expired CN1012875B (en) | 1990-05-19 | 1990-05-19 | Impedance converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1012875B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101223438B (en) * | 2005-07-14 | 2011-10-26 | 梅特勒-托利多公开股份有限公司 | Signal transmission device for a measuring probe and method for doing the same. |
| CN108427243A (en) * | 2018-03-16 | 2018-08-21 | 联想(北京)有限公司 | A kind of projection means of defence and projection device |
| CN110798173A (en) * | 2019-10-18 | 2020-02-14 | 浙江中控技术股份有限公司 | Fieldbus power regulator circuit |
-
1990
- 1990-05-19 CN CN 90103534 patent/CN1012875B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101223438B (en) * | 2005-07-14 | 2011-10-26 | 梅特勒-托利多公开股份有限公司 | Signal transmission device for a measuring probe and method for doing the same. |
| CN108427243A (en) * | 2018-03-16 | 2018-08-21 | 联想(北京)有限公司 | A kind of projection means of defence and projection device |
| CN110798173A (en) * | 2019-10-18 | 2020-02-14 | 浙江中控技术股份有限公司 | Fieldbus power regulator circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1012875B (en) | 1991-06-12 |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| 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 |