EP0905598B1 - Schaltbare Stromquellenschaltung - Google Patents
Schaltbare Stromquellenschaltung Download PDFInfo
- Publication number
- EP0905598B1 EP0905598B1 EP19980117578 EP98117578A EP0905598B1 EP 0905598 B1 EP0905598 B1 EP 0905598B1 EP 19980117578 EP19980117578 EP 19980117578 EP 98117578 A EP98117578 A EP 98117578A EP 0905598 B1 EP0905598 B1 EP 0905598B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- current source
- source circuit
- transistors
- current
- electronic switch
- 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 - Lifetime
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is DC
- G05F3/10—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/26—Current mirrors
- G05F3/262—Current mirrors using field-effect transistors only
Definitions
- the present invention relates to a switchable current source circuit, with the currents of different signs can be switched to a common output.
- Such Circuits are found in phase locked loops, for example Use.
- Switchable current source circuits are from the prior art known. There is one in the current source circuits so-called current mirror circuit provided.
- a current mirror circuit is a current source circuit with transistors, where the output current is in a certain ratio to the input or reference current. About a tax stage a control or input current is impressed, and depending from the impressed control current becomes a control voltage provided.
- the current mirror circuit also has one Output stage, which depends on the control voltage of the Control stage provides an output current that is almost independent of the load is. The output current is proportional to the input or control current. The output current can be larger, be equal to or less than the input current.
- These current source circuits can now be switched Current source circuits can be formed. Doing so Output stage of the current mirror via an electronic Switch connected to a usually fixed reference potential.
- the current source circuit uses two current mirror circuits, the output stages of which electronic switches with different reference potentials Sign can be connected. The one or the other resulting currents are mapped to a common output.
- Such a switchable current source circuit is from the European one Patent EP 0 570 820 known. Your structure and their mode of operation should be based on the drawing figure 1 are shown in more detail.
- the ones in this European Patent specification and shown in the drawing figure 1 Power source circuit consists of two individual circuits that an upper part or a lower part of the overall circuit form, the main component of each one Current mirror circuit is.
- the upper part of the circuit which is above an imaginary horizontal line that is level with the common Output pdx extends, allows a positive To generate current at the common output pdx.
- the upper part of the Circuit comprises the current mirror circuit made up of the transistors T3b and T1b, and the lower part of the circuit includes the Current mirror circuit made up of transistors T3a and T1a. On the nodes ipx and inx become the reference currents to be mirrored for the upper part or the lower part the circuit provided.
- T2b or T1a becomes a capacity in the upper part of the circuit between the nodes ipx, at which the reference current is fed, and upn, at which the control signal for the switching transistor T2b is fed is, or in the lower part of the circuit between the nodes inx at which the reference current is fed, and dnx, on which the control signal for the switching transistor T2a is fed, switched.
- These capacities are in the circuit described in EP 0 570 820 by the CMOS transistors T6b and T6a realized.
- the capacities are dimensioned so that when the Transistors T2b and T2a have the same charge the capacitance to the gate of transistor T1b respectively T1a is coupled, as for unloading respectively Charging of the gate-source capacitance of the transistor is required becomes. Because of this dimensioned and switched capacities is obtained immediately after switching on the power source an output current that has no overshoot or undershoot corresponds to the DC value.
- the dependence of the current pulse on the output compared to the Supply voltage is caused by the fact that at a As the supply voltage rises, the gate-source / drain voltage increases of the transistors T6b and T6a greatly increased. This occurs particularly at the transition of the transistors from the subthreshold to the triode range. With the transistors T6b and T6a are source and drain directly with each other connected, short-circuited, which is the only one Voltage drop between gate and source (connected to Drain) gives what is called gate-source / drain voltage shall be.
- the supply voltage increases by one certain factor for a variation of the generated output current pulse, which is well above this factor. Only after the complete unloading or recharging of capacities this arises due to the circuit dimensioning selected nominal current at the output.
- the object of the present invention is a switchable Specify current source circuit that is free of this frequency and is dependent on supply voltage.
- FIG. 1 shows the current source circuit already described in detail above the prior art, as they are in particular described in European patent EP 0 570 820 is.
- FIG. 2 shows the switchable current source circuit according to the present invention. Circuit elements that are already out 1 correspond to known circuit elements, are provided with the same reference numerals.
- the circuit of FIG. 2 differs from the known circuit of Figure 1 in that the Transistors T5b and T5a and the transistors T7b and T7a new have been added.
- the transistors T5b and T5a are used to dependency of the output current pulse from the switching frequency Reduce. By selecting and connecting T5b and T5a make it possible to get the unwanted voltage potential to avoid at the node mpls or mnls. Since the upper and lower part of the circuit symmetrical are only the upper part of the circuit is described below become.
- the switching transistor T2b If the switching transistor T2b is turned off, it will Voltage potential at the node mpls via the transistor T5b discharged.
- a discharge via a separate power source via the reference currents dnx or inx or possible via the supply voltages VDD or VSS. This is done in the circuit shown in FIG Discharge compared to the supply voltages VDD respectively VSS. In the event of a discharge via the supply voltages one prevents the reference currents from being influenced. Farther is a minimization of the transistor area of T5a possible. Generally a very small transistor (T5a / b) are sufficient to ensure a very fast discharge to ensure the potential of mp1s / mn1s.
- Transistors T7b and T7a are used to control the dependency the current source circuit of variations in the supply voltage to diminish. Through the transistors T7b and Additional capacity will be introduced in T7a. Because upper and lower part of the circuit are symmetrical to each other only the upper part of the circuit is described below become.
- the transistor T6b decouples the node PC from the switch-on signal upn. A voltage drops across the transistor T6b with the supply voltage and thus also its change correlated. With appropriate dimensioning of the transistor geometries assume that these on the transistor T6b falling voltage far above the threshold voltage of transistor T6b. As a result, its capacitance values vary barely. The transistor T6b is therefore only in the area LINEAR / TRIODE operated.
- the Transistor T7b is also an appropriate choice assuming the transistor geometry, in the range LINEAR / TRIODE operated to SUBTRESHOLD. So follows for example an increase in the supply voltage VCC The gate-source / drain voltage drops across the transistor T7b to the same extent.
- transistors T7b and T7a as well as T6b and T6a can be exploited by taking advantage of the dependency the gate-source / drain capacitance of transistors T7b and T7a and T6b and T6a the voltage dependency the current impulses at the output compensate considerably.
- the transistor T7b or T7a compared to the transistor T6b respectively T6a about twice the size.
- the overall circuit geometrical it is possible to make the overall circuit geometrical to vary. For example, if you use smaller ones (larger) current mirror transistors (T3b / T1b and T3a / T1a), so can the transistors T7a / T6a (respectively T7b / T6b) can be reduced accordingly. decreases the source-drain dimensions of the used Transistors, so you can see the gate dimensions of these transistors also zoom out. This has no effect on the Functionality of the circuit, provided there has been an optimization this parameter performed.
- T6b / T7b or T6a / T7a can also have two antiserials Diodes or two antiserial bipolar transistors be used.
- the switchable current source circuit according to the invention knows compared to switchable current source circuits that are known from the prior art, especially compared the switchable current source circuit described in EP 0 570 820, a greatly reduced dependency of the Output current pulse against changes in switching frequency and against changes in the supply voltage.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Electronic Switches (AREA)
Description
- Figur 1
- eine schaltbare Stromquellenschaltung des Standes der Technik;
- Figur 2
- eine schaltbare Stromquellenschaltung gemäß der vorliegenden Erfindung.
Claims (7)
- Schaltbare Stromquellenschaltung mit einem elektronischen Schalter (T2b, T2a) und mit einer Stromspiegelanordnung (T3b, T4b, T1b; T3a, T4a, T1a), gebildet aus einer Steuerstufe (T3b, T4b; T3a, T4a), die abhängig von einem an einem Stromeingang (ipx, inx) eingeprägten Referenzstrom an einem Spannungsausgang (x) eine Steuerspannung bereitstellt, und aus einer Ausgangsstufe (T1b, T1a) mit einem Steuereingang, der mit dem Spannungsausgang (x) der Steuerstufe (T3b, T4b; T3a, T4a) verbunden ist, und mit einer Steuerstrecke mit zwei Anschlüssen, von denen einer den Stromausgang (pdx) der Stromquellenschaltung bildet und der andere mit einem Anschluß des elektronischen Schalters (T2b; T2a) verbunden ist, wobei der andere Anschluß des elektronischen Schalters (T2b; T2a) mit einem Versorgungsspannungsanschluß (VDD; VSS) verbunden ist, und die Stromquellenschaltung abhängig von der Ansteuerung des Steuereingangs (upn; dnx) des elektronischen Schalters (T2b; T2a) ein- und ausschaltbar ist, wobei der Steuereingang (upn; dnx) des elektronischen Schalters (T2b; T2a) über eine Kapazität (T6b; T6a) mit dem Stromeingang (ipx; inx) des Referenzstromes verbunden ist,
dadurch gekennzeichnet, daß zwischen den sich zwischen dem elektronischen Schalter (T2b; T2a) und dem Spiegeltransistor (T1b; T1a) befindlichen Knoten (mp1s; mn1s) und dem Versorgungsspannungsanschluß (VSS; VDD) oder einer getrennte Stromquelle oder dem Anschluß des Referenzstromes (ipx; inx) ein Transistor (T5b; T5a) zum Entladen des sich am Knoten (mp1s; mn1s) vorhandenen Spannungspotentials beim Abschalten des elektronischen Schalters (T2b; T2a) geschaltet ist, und daß zusätzlich zur schon vorhandenen Kapazität (T6b; T6a) zwischen Steuereingang (upn; dnx) des elektronischen Schalters (T2b; T2a) und Stromeingang (ipx; inx) in Reihe eine weitere Kapazität (T7b; T7a) geschaltet ist. - Schaltbare Stromquellenschaltung nach Anspruch 1,
dadurch gekennzeichnet, daß die Kapazitäten (T6b; T6a, T7b; T7a) durch MOS-Transistoren gebildet werden, deren Source- und Drain-Anschlüsse in kurzschließender Weise miteinander verbunden sind. - Schaltbare Stromquellenschaltung nach Anspruch 2,
dadurch gekennzeichnet, daß die Transistoren (T7b; T7a), die die zusätzlichen Kapazitäten bilden, gegenüber den Transistoren (T6b; T6a), die die ursprünglichen Kapazitäten bilden, die doppelte Größe aufweisen. - Schaltbare Stromquellenschaltung nach Anspruch 1,
dadurch gekennzeichnet, daß die Kapazitäten (T6b; T6a, T7b; T7a) durch zwei antiserielle Dioden gebildet werden. - Schaltbare Stromquellenschaltung nach Anspruch 1,
dadurch gekennzeichnet, daß die Kapazitäten (T6b; T6a, T7b; T7a) durch zwei antiserielle Bipolartransistoren gebildet werden. - Schaltbare Stromquellenschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß als Transistoren und Schalter selbstsperrende n-Kanal MOS-Transistoren verwendet werden. - Schaltbare Stromquellenschaltung nach einem der Ansprüche 1-5,
dadurch gekennzeichnet, daß als Transistoren und Schalter selbstsperrende p-Kanal MOS-Transistoren verwendet werden.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19743204 | 1997-09-30 | ||
DE19743204 | 1997-09-30 | ||
DE19803471 | 1998-01-29 | ||
DE19803471A DE19803471C2 (de) | 1997-09-30 | 1998-01-29 | Schaltbare Stromquellenschaltung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0905598A1 EP0905598A1 (de) | 1999-03-31 |
EP0905598B1 true EP0905598B1 (de) | 2002-01-09 |
Family
ID=26040457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980117578 Expired - Lifetime EP0905598B1 (de) | 1997-09-30 | 1998-09-16 | Schaltbare Stromquellenschaltung |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0905598B1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19933799A1 (de) | 1999-07-19 | 2001-01-25 | Siemens Ag | Elektronische Schaltung, insbesondere für ein Mobilfunkgerät |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4950976A (en) * | 1989-09-29 | 1990-08-21 | Westinghouse Electric Corp. | Current variation reduction for mosfet current sources |
DE4201155C1 (de) * | 1992-01-17 | 1993-01-28 | Texas Instruments Deutschland Gmbh, 8050 Freising, De | |
DE4216712A1 (de) * | 1992-05-20 | 1993-11-25 | Siemens Ag | Schaltbare Stromquellenschaltung und Verwendung einer solchen in einer Phasedetectoranordnung |
FR2738422B1 (fr) * | 1995-08-31 | 1997-10-24 | Suisse Electronique Microtech | Circuit de polarisation destine a fixer le niveau moyen d'une tension alternative |
-
1998
- 1998-09-16 EP EP19980117578 patent/EP0905598B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0905598A1 (de) | 1999-03-31 |
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