DE2419333C2 - Circuit arrangement for compensating a resistance by means of a controllable negative resistance, in particular for electronic coupling arrangements - Google Patents
Circuit arrangement for compensating a resistance by means of a controllable negative resistance, in particular for electronic coupling arrangementsInfo
- Publication number
- DE2419333C2 DE2419333C2 DE19742419333 DE2419333A DE2419333C2 DE 2419333 C2 DE2419333 C2 DE 2419333C2 DE 19742419333 DE19742419333 DE 19742419333 DE 2419333 A DE2419333 A DE 2419333A DE 2419333 C2 DE2419333 C2 DE 2419333C2
- Authority
- DE
- Germany
- Prior art keywords
- resistance
- resistor
- inverting input
- negative
- operational amplifier
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/06—Modifications for ensuring a fully conducting state
Description
3535
Die Erfindung betrifft eine Schaltungsanordnung nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a circuit arrangement according to the preamble of claim 1.
Es ist bekannt, durch Hintereinanderschaltung eines zu kompensierenden Widerstandes und eines regelbaren, negativen Widerstandes den negativen Widerstand derart zu wählen, daß der Gesamtwiderstand verschwindet, d. h, daß ein den zu kompensierenden Widerstand und den negativen Widerstand durchfließender Strom an der gesamten Anordnung keinen Spannungsabfall verursacht (siehe z. B.: J. Dosse, »Der Transistor«, Oldenbourg Verlag 1959, S. 217 - 221).It is known that a resistor to be compensated and a controllable resistor can be connected in series. negative resistance to choose the negative resistance in such a way that the total resistance disappears, d. This means that the resistance to be compensated and the negative resistance flowing through Current does not cause a voltage drop in the entire arrangement (see, for example: J. Dosse, »Der Transistor ", Oldenbourg Verlag 1959, pp. 217-221).
Eine solche Anordnung hat insbesondere praktische Bedeutung für eine Anwendung in elektronischen Koppelanordnungen in Fernsprechvermittlungsstellen. Die Ersetzung der bekannten, üblichen Metallkontakttzur Durchschaltung durch die Koppelanordnung durch elektronische Schaltelemente bringt eine erhebliche Erhöhung des resultierenden Widerstands mit sich, der sich bei mehrstufigen Koppelanordnungen addiert und eine erhebliche, evtl. nicht mehr zulässige Dämpfung der über die Koppelanordnung laufenden Ströme verursacht. Such an arrangement is of particular practical importance for an application in electronic Switching arrangements in telephone exchanges. The replacement of the known, customary metal contact door Switching through the coupling arrangement by electronic switching elements brings a considerable Increase in the resulting resistance, which is added in multi-stage coupling arrangements and causes considerable, possibly no longer permissible attenuation of the currents running through the coupling arrangement.
Um eine zumindest teilweise Kompensation dieser Widerstände zu erreichen, muß durch die gesamte Anordnung (zu kompensierender Widerstand und negativer Widerstand) ein Meßstrom geschickt werden, mit dessen Hilfe die Anordnung unter Regelung des negativen Widerstands derart abgeglichen werden kann, daß der resultierende Widerstand der Anordnung « gegenüber einem durchlaufenden Nutzstrom zumindest auf einen kleineren Wert gesenkt werden kann.In order to achieve an at least partial compensation of these resistances, must be through the entire Arrangement (resistance to be compensated and negative resistance) a measuring current can be sent, with the help of which the arrangement can be adjusted in such a way under control of the negative resistance can that the resulting resistance of the arrangement « can be reduced at least to a smaller value compared to a useful current passing through.
Aufgabe der Erfindung ist demnach, unter BerückDas hat Konsequenzen für die Anschaltung eines Generators G im Punkt A (Fig.2). Der Innenwiderstand RL des Generators G addiert sich zum Widerstand R 4 und die daraus folgende Stabilitätsbedingung The object of the invention is therefore, taking into account that this has consequences for the connection of a generator G at point A (FIG. 2). The internal resistance RL of the generator G is added to the resistance R 4 and the resulting stability condition
A3A3
muß nicht mehr erfüllt sein, d. h., die Anordnung wird eher instabil.no longer has to be fulfilled, d. that is, the arrangement tends to become unstable.
F i g. 3 zeigt die erfindungsgemäße Schaltungsanordnung, die diese Schwierigkeiten vermeidet.F i g. 3 shows the circuit arrangement according to the invention which avoids these difficulties.
Das wesentliche Element dieser Schaltungsanordnung ist ein zweiter negativer Widerstand — R2, gebildet aus einem Operationsverstärker OP 2, der zwischen der anzuschaltenden Spannungsquelle G und den Punkt A geschaltet ist. Dadurch liegt am ersten Operationsverstärker OPl in Reihe mit dem Widerstand /?4 nunmehr der negative Widerstand -RL, wodurch die Stabilitätsbedingung lautet:The essential element of this circuit arrangement is a second negative resistor - R2, formed from an operational amplifier OP 2, which is connected between the voltage source G to be connected and the point A. As a result, the negative resistance -RL is now in series with the resistor /? 4 at the first operational amplifier OP1, which means that the stability condition is:
§RK>R4>§RL.§RK> R4> §RL.
Das Stabilitätsverhalten dieser Anordnung ist also verbessert.The stability behavior of this arrangement is therefore improved.
Die Kompensation des Widerstands RK erfolgt folgendermaßen: The compensation of the resistance RK takes place as follows:
Der über die Anordnung zu übertragende Nutzstrom /,v »sieht« als Widerstand der gesamten Anordnung:The useful current /, v to be transmitted via the arrangement "sees" as the resistance of the entire arrangement:
4141
(D(D
denn der erste Operationsverstärker OPl liefert einen Widerstand - — RA und der Innenwiderstand RL istbecause the first operational amplifier OPl provides a resistance - - RA and the internal resistance is RL
durch eine komplexe Schaltung C wechselstrommäßig Oberbrückt, trägt also nicht zum Gesamtwiderstand bei. Im Falle, daß der Meßstrom ein Gleichstrom ist, kann die komplexe Schaltung C durch einen Kondensator realisiert werden. Ein Meßstrom IM »sieht« als Widerstand der gesamten Anordnung:Bridged alternating current by a complex circuit C , so it does not contribute to the total resistance. In the event that the measuring current is a direct current, the complex circuit C can be implemented by a capacitor. A measuring current I M "sees" as the resistance of the entire arrangement:
denn der erste Operationsverstärker OPl transformiert den Widerstand RK in den Widerstand - — RK, die-because the first operational amplifier OPl transforms the resistor RK into the resistor - - RK, the-
ser liegt am zweiten Operationsverstärker OPl zusammen mit dem Widerstand A4, der zweite Operationsverstärker OPl transformiert den anliegenden Wider-ser is on the second operational amplifier OPl together with the resistor A4, the second operational amplifier OPl transforms the adjacent resistor
stand A4 - ^ RK schließlich in den WiderstandA4 - ^ RK finally stood in the resistance
Für den zu übertragenden Nutzstrom /„soll gelten:For the useful current to be transmitted / "should apply:
Rn=Q.
Damit ergibt sich aus Gleichung (1): R n = Q.
This results from equation (1):
Dies eingesetzt in die Gleichung (2) ergibt: Rn = RL, d.h, das Potential am Punkt X (Fig.3) muß verschwinden.Inserting this into equation (2) results in: Rn = RL, that is, the potential at point X (Fig. 3) must vanish.
Diese Bedingung ist leicht zu erfüllen: eine nicht dargestellte Vergleichsschaltung zwischen Erde und Punkt Λ'kann den ersten Operatioijsverstärker OPi so regeln, daß diese Bedingung erfüllt ist, womit der Widerstand RK kompensiert ist.This condition is easy to meet: a comparison circuit, not shown, between earth and point Λ 'can regulate the first operational amplifier OPi in such a way that this condition is met, with which the resistance RK is compensated.
Hierzu 2 Blatt ZeichnungenFor this purpose 2 sheets of drawings
Claims (1)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19742419333 DE2419333C2 (en) | 1974-04-22 | 1974-04-22 | Circuit arrangement for compensating a resistance by means of a controllable negative resistance, in particular for electronic coupling arrangements |
GB1540975A GB1476908A (en) | 1974-04-22 | 1975-04-15 | Resistance compensation circuit |
FR7512065A FR2268420A1 (en) | 1974-04-22 | 1975-04-18 | Resistance compensation by variable negative resistance - embodies a circuit using operational amplifier |
ES436811A ES436811A1 (en) | 1974-04-22 | 1975-04-21 | Resistance compensation circuit |
BE2054293A BE828205A (en) | 1974-04-22 | 1975-04-22 | COMPENSATION CIRCUIT FOR A RESISTANCE BY A VARIABLE NEGATIVE RESISTANCE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19742419333 DE2419333C2 (en) | 1974-04-22 | 1974-04-22 | Circuit arrangement for compensating a resistance by means of a controllable negative resistance, in particular for electronic coupling arrangements |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2419333A1 DE2419333A1 (en) | 1975-11-06 |
DE2419333C2 true DE2419333C2 (en) | 1983-09-15 |
Family
ID=5913572
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19742419333 Expired DE2419333C2 (en) | 1974-04-22 | 1974-04-22 | Circuit arrangement for compensating a resistance by means of a controllable negative resistance, in particular for electronic coupling arrangements |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2419333C2 (en) |
ES (1) | ES436811A1 (en) |
GB (1) | GB1476908A (en) |
-
1974
- 1974-04-22 DE DE19742419333 patent/DE2419333C2/en not_active Expired
-
1975
- 1975-04-15 GB GB1540975A patent/GB1476908A/en not_active Expired
- 1975-04-21 ES ES436811A patent/ES436811A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES436811A1 (en) | 1977-04-01 |
DE2419333A1 (en) | 1975-11-06 |
GB1476908A (en) | 1977-06-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2052520C3 (en) | ||
DE2112723A1 (en) | Very high input impedance circuit | |
DE19725842C2 (en) | Circuit arrangement for generating a load-independent DC voltage | |
DE2718491A1 (en) | CIRCUIT ARRANGEMENT FOR THE AMPLIFICATION OF THE SIGNALS OF AN ELECTROMAGNETIC CONVERTER AND FOR THE GENERATION OF PRESET VOLTAGE FOR THE CONVERTER | |
DE2643020A1 (en) | SCHMITT TRIGGER | |
DE2840034A1 (en) | LIQUID CRYSTAL DISPLAY DEVICE | |
DE3607966A1 (en) | CIRCUIT ARRANGEMENT FOR VOLTAGE REGULATION, ESPECIALLY FOR AC ALTERNATORS | |
DE2419333C2 (en) | Circuit arrangement for compensating a resistance by means of a controllable negative resistance, in particular for electronic coupling arrangements | |
DE4101492C2 (en) | ||
DE2660031C2 (en) | Digital display circuit for a photographic light meter | |
DE2446270A1 (en) | LEVEL INDICATOR | |
EP0011720A1 (en) | Circuitry for suppressing the influence of interfering voltages at the evaluation of the condition of a signal on transmission lines, particularly on subscriber lines in telephone installations | |
DE2641912C3 (en) | Circuit arrangement for the transmission of electrical power supplies | |
DE2531998A1 (en) | PRE-VOLTAGE CIRCUIT FOR DIFFERENTIAL AMPLIFIER | |
DE2516853A1 (en) | CONTROL DEVICE FOR MEASURING CIRCUITS FOR THE VOLTAGE ON POWER LINES | |
DE2214430C3 (en) | Device for converting a measurement voltage derived from a non-electrical quantity into a second voltage | |
DE2642239C2 (en) | Directional pulse generator | |
DE2830481A1 (en) | PROTECTIVE CIRCUIT FOR A COUNTERACTIVE POWER AMPLIFIER | |
DE3511966C2 (en) | Current control for an electromagnetic consumer in connection with an internal combustion engine | |
DE2933840A1 (en) | CIRCUIT ARRANGEMENT FOR CHECKING AND CONTROLLING THE COEFFICIENTS OF AN ANALOG ADAPTIVE EQUALIZER | |
DE3511967A1 (en) | DEVICE FOR CONTROLLING ELECTRICAL CONSUMERS IN MOTOR VEHICLES | |
DE2213712A1 (en) | Matrix circuit arrangement | |
DE1924783A1 (en) | Circuit arrangement for converting a change in resistance into a proportional change in conductance | |
DE3032970A1 (en) | Balanced signal derived from telephone line - has operational amplifier between constant current generators with input connection to potential divider | |
DE1925498C (en) | Circuit arrangement for automatically compensating for the difference in damping of different lengths of telephone subscribers connection lines |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
OD | Request for examination | ||
8125 | Change of the main classification |
Ipc: H03H 11/28 |
|
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |