EP1310850A2 - Source de courant commutable dynamiquement - Google Patents

Source de courant commutable dynamiquement Download PDF

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Publication number
EP1310850A2
EP1310850A2 EP02015758A EP02015758A EP1310850A2 EP 1310850 A2 EP1310850 A2 EP 1310850A2 EP 02015758 A EP02015758 A EP 02015758A EP 02015758 A EP02015758 A EP 02015758A EP 1310850 A2 EP1310850 A2 EP 1310850A2
Authority
EP
European Patent Office
Prior art keywords
current
potential
current source
controlled mode
voltage
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.)
Withdrawn
Application number
EP02015758A
Other languages
German (de)
English (en)
Other versions
EP1310850A3 (fr
Inventor
Bernhard Engl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Infineon Technologies AG
Original Assignee
Infineon Technologies AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Infineon Technologies AG filed Critical Infineon Technologies AG
Publication of EP1310850A2 publication Critical patent/EP1310850A2/fr
Publication of EP1310850A3 publication Critical patent/EP1310850A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices

Definitions

  • the present invention relates to a power source between one current controlled and one voltage controlled Mode is switchable.
  • Such power sources have a variety of uses, for example in connection with digital / analog converters.
  • the switchable current source In current controlled mode, the switchable current source a current Iref is fed through a current mirror to other circuit parts on an integrated circuit passes.
  • the present invention is therefore based on the object one between a current controlled mode and a voltage controlled one Mode to create switchable power source that works stably under all circumstances and with a minimal Number of housing connections is sufficient.
  • the switching threshold of the comparator a value, by which under all circumstances it can be ensured that those controlled by the comparator Switches are operated so that the power source in the current controlled mode works when in current controlled Mode should work, and that the power source is voltage controlled Mode works when in voltage controlled Mode should work.
  • the switchable power source described below is Part of an integrated circuit. However, it should illuminate that the power source also on any other Way is feasible.
  • the transistor T1 is arranged so that it interacts with one connected to the output terminal KC another transistor forms a current mirror through which is caused that the current flowing through the transistor T1 in the other connected to the output connection KC Transistor is mirrored.
  • the transistor T1 is a P-channel MOSFET, whose source connection with the positive pole VDD Supply voltage is connected.
  • it can also be a PNP bipolar transistor take its place depending on the used for the implementation of the integrated circuit Process technology.
  • the controllable switches S1 and S2 ensure that that the transistor T1 in the voltage-controlled mode by the Output signal OA of the operational amplifier OP driven is, and in the current-controlled mode by the at the drain connection of the transistor T1 adjusting voltage driven becomes.
  • the switches S1 and S2 themselves become dependent on the output signal CA of the comparator COMP controlled.
  • the reference voltage Vref is selected so that the output CA of the comparator COMP assumes a state in which the controlled one Switch S1 is closed and the controlled one Switch S2 is open; the reference voltage Vref must be considered Example of this above the switching threshold of Comparator COMP lie.
  • the operational amplifier OP With the closed switch S1 and the open switch S2 becomes the operational amplifier OP so that a voltage is present across resistor R. sets the ideally against the voltage at terminal KB the reference potential corresponds to GND.
  • switch S1 opens in current-controlled mode the operational amplifier OP has no influence the conditions at terminal KC; this are exclusively from the reference current supplied to terminal KA Iref determined.
  • a comparator COMP whose inner switching threshold close to that in the current controlled Mode applied to the terminal KB, in the considered Example, for example, some 100 mV above GND lies.
  • Such a comparator is in the current-controlled Potential applied to terminal KB (GND) in the state that he must have in order for him (through a corresponding control of switches S1 and S2) Power source placed in the current controlled mode, and on the other hand through the in voltage controlled mode to the Terminal KB applied potential (Vref) set in the state which he must hold so that he (by means of an appropriate control the switches S1 and S2) the current source in the voltage controlled mode.
  • GND current-controlled Potential applied to terminal KB
  • Vref Terminal KB applied potential
  • the switching threshold is some 100mV below VDD.
  • the small switching thresholds used can be in comparator circuits achieved through a deliberately built-in asymmetry but also the use of transistor switching thresholds is conceivable what the circuitry for the comparator (this will be explained later with reference to the figure 2 explained in more detail).
  • the KB terminal is connected to GND, this is the case the terminal KB applied potential in any case far below the potential at terminal KA, which is due to the im current controlled mode closed controllable switch S2 is identical to the potential at terminal KC.
  • This results results from the higher supply potential VDD minus the gate source voltage or the base-emitter voltage of the transistor T1 and is in any case significantly above the supply potential GND.
  • the plus is located Input of the operational amplifier OP at a much higher level Potential as its input marked with minus and the The output of a suitable operational amplifier is then reliable at a stable maximum value and moves Not.
  • Figure 2 shows an example of a practical implementation of the Circuit according to Figure 1 in a CMOS process.
  • CMOS process For this too Example applies that by swapping the supply voltage terminals VDD, GND and n-channel MOSFETs through p-channel MOSFETs a complementary circuit can be derived.
  • the operational amplifier OP is by transistors T2 to T6 realized, and the comparator COMP by transistors T7 and T8, which are connected as shown in Figure 2.
  • the controllable switches S1 and S2 are made by p-channel MOS-FETs realized whose gate connections with the signals CA (Switch S1) or CA ⁇ (switch S2) are connected.
  • a resistor Rc and a series resistor Capacitor Cc are used for compensation the frequency response of the control loop that arises when switch S1 is closed and switch S2 is open is, that is, in the voltage-controlled mode of the power source.
  • the comparator COMP is a simple circuit, because there is no high accuracy of the switching threshold Value is placed.
  • the switching threshold is essentially by the threshold voltage of the transistor T7 and its Given process amplification, and by a current Ic, the it is supplied via transistor T8.
  • Whose gate connection G8 has a suitable potential Vbp for this connected so that transistor T8 has a defined drain current Ic delivers.
  • transistor T3 When transistor T7 turns off, transistor T3 also turns off the differential stage T3 / T4 of the operational amplifier. consequently flows the supplied to the differential stage via the foot power source T2 Bias current Ib from a potential Vbn at the gate terminal G2 of the transistor T2 is completely dependent on the transistor T4 on the current mirror T5, T6. Because the transistor T3 blocks, turns at the output OA of the operational amplifier a potential VDD. Fluctuations of this output due to the negative feedback being switched off locked out.
  • the accuracy of Iref essentially depends on the offset voltage of the operational amplifier, which is why the Reference voltage Vref should preferably be chosen so that the amount is much larger than the offset voltage.
  • Vref can the built-in threshold voltage of the comparator never be chosen small, so that a practice-typical offset voltage of a few 10 mV is not so important.
  • the series connection off the resistor Rc and the capacitor Cc cause miller compensation of the entire control loop and is appropriate Sizing able for stability any gain value in practice F guarantee.
  • This dimensioning is from theory of the so-called mill-compensated operational amplifier as known to presuppose.
  • the dynamic behavior of the circuit is essentially the steepness of the transistors T3, T4 in the operational amplifier and the value of the Capacitor Cc and foot current Ib, and not from Gain factor F.
  • Vbn and Vbp are suitable for generating the gate potentials a variety of bias circuits, such as the bias circuit from Wai-Kai Chen: “The Circuit and Filters Handbook", CRC Press 1995, Figure 57.56, page 1686.
  • the gate potentials Vbn and Vbp can be connected directly to the gates of the corresponding p-channel and n-channel current mirror of this bias circuit be removed.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Amplifiers (AREA)
EP02015758A 2001-07-16 2002-07-13 Source de courant commutable dynamiquement Withdrawn EP1310850A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10134450 2001-07-16
DE10134450A DE10134450A1 (de) 2001-07-16 2001-07-16 Umschaltbare Stromquelle

Publications (2)

Publication Number Publication Date
EP1310850A2 true EP1310850A2 (fr) 2003-05-14
EP1310850A3 EP1310850A3 (fr) 2004-10-06

Family

ID=7691908

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EP02015758A Withdrawn EP1310850A3 (fr) 2001-07-16 2002-07-13 Source de courant commutable dynamiquement

Country Status (3)

Country Link
US (1) US6700362B2 (fr)
EP (1) EP1310850A3 (fr)
DE (1) DE10134450A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6861829B2 (en) * 2002-08-12 2005-03-01 Micron Technology, Inc. Apparatus and methods for regulated voltage
DE102004030161B4 (de) * 2004-06-22 2007-10-11 I F M Electronic Gmbh Schlatungsanordnung zum wahlweisen Generieren eines analogen Stromausgangswertes oder eines analogen Spannungsausgangswertes
US20060181255A1 (en) * 2005-02-15 2006-08-17 Schreck John F Apparatus and methods for regulated voltage
JP5458825B2 (ja) * 2009-07-10 2014-04-02 富士通株式会社 電圧レギュレータ回路
US10886882B2 (en) * 2019-02-01 2021-01-05 M31 Technology Corporation Load circuit of amplifier and driver circuit for supporting multiple interface standards

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383188A (en) * 1978-11-14 1983-05-10 Beckman Instruments, Inc. Voltage-controlled constant current source

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303411A (en) * 1963-04-30 1967-02-07 Forbro Design Corp Regulated power supply with constant voltage/current cross-over and mode indicator
US4814688A (en) * 1988-03-03 1989-03-21 Brooktree Corporation Reference generator
US5142219A (en) * 1991-05-01 1992-08-25 Winbond Electronics North America Corporation Switchable current-reference voltage generator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383188A (en) * 1978-11-14 1983-05-10 Beckman Instruments, Inc. Voltage-controlled constant current source

Also Published As

Publication number Publication date
US20030020439A1 (en) 2003-01-30
US6700362B2 (en) 2004-03-02
DE10134450A1 (de) 2003-02-06
EP1310850A3 (fr) 2004-10-06

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