WO2002027940A2 - Means for compensating a data-dependent supply current in an electronic circuit - Google Patents

Means for compensating a data-dependent supply current in an electronic circuit Download PDF

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Publication number
WO2002027940A2
WO2002027940A2 PCT/EP2001/010660 EP0110660W WO0227940A2 WO 2002027940 A2 WO2002027940 A2 WO 2002027940A2 EP 0110660 W EP0110660 W EP 0110660W WO 0227940 A2 WO0227940 A2 WO 0227940A2
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WO
WIPO (PCT)
Prior art keywords
cmp
supply connection
current
circuit
compensation
Prior art date
Application number
PCT/EP2001/010660
Other languages
French (fr)
Other versions
WO2002027940A3 (en
Inventor
Jeroen M. Van Den Boom
Jan R. Westra
Quino A. Sandifort
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to DE60128403T priority Critical patent/DE60128403T2/en
Priority to JP2002531613A priority patent/JP2004510381A/en
Priority to KR1020027006656A priority patent/KR20020060753A/en
Priority to EP01969719A priority patent/EP1380113B1/en
Publication of WO2002027940A2 publication Critical patent/WO2002027940A2/en
Publication of WO2002027940A3 publication Critical patent/WO2002027940A3/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
    • H03M1/0617—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence
    • H03M1/0675—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence using redundancy
    • H03M1/0678—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence using redundancy using additional components or elements, e.g. dummy components
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H03M1/74—Simultaneous conversion
    • H03M1/742—Simultaneous conversion using current sources as quantisation value generators

Definitions

  • the invention relates to an electronic circuit comprising a data processing circuit for processing a digital signal, which data processing circuit is coupled between a first supply connection terminal and a second supply connection terminal for receiving a supply voltage.
  • a data processing circuit for processing a digital signal
  • Such an electronic circuit is known from the general prior art.
  • the current consumed by the data processing circuit is dependent on the data content of the digital signal.
  • a certain wiring impedance (ohmic resistance and self-inductance) is always present in series with the supply lines of the data processing circuit. Owing to the presence of this wiring impedance, and owing to the fact that the current consumed by the data processing circuit is dependent on the data content of the digital signal, the data processing circuit is supplied with a voltage which has a data-dependent component.
  • the so-called Power Supply Rejection Ratio of an electronic circuit is always finite, so that distortion of signals will arise in the data processing circuit in dependence on the value of the Power Supply Rejection Ratio.
  • an undesirable signal crosstalk may arise to other parts of the electronic circuit.
  • Efforts are made in practice to limit this signal distortion and signal crosstalk by designing the data processing circuit such that the Power Supply Rejection Ratio is a maximum. Efforts are further made to minimize the wiring impedance present. These measures, however, are not always sufficient. Moreover, these measures may have the result that the implementation of the data processing circuit is very complicated. It is also possible that such an implementation, in which a high Power Supply Rejection Ratio is sought after, will have a negative impact on other quality aspects.
  • the electronic circuit mentioned in the opening paragraph is for this purpose characterized in that the electronic circuit comprises a current compensation circuit which is coupled between the first supply connection terminal and the second supply connection terminal for receiving the supply voltage, which current compensation circuit in the operational state is controlled from the digital signal such that the sum of the current consumption of the data processing circuit and the current consumption of the current compensation circuit is substantially independent of the data content of the digital signal.
  • Both the data processing circuits and the current compensation circuit have a current consumption which is data-dependent.
  • the data-dependent component of the current consumption of the current compensation circuit has the same magnitude as the data- dependent component of the current consumption of the data processing circuit.
  • the two said current components are in counter-phase. Since the supply connection points of the data processing circuit and of the current compensation circuit are interconnected by means of a very short wiring, there will be substantially no data-dependent current through the wiring impedances. This is because the data-dependent component of the data processing circuit and the data-dependent component of the current compensation circuit compensate one another. The result of this is that the data processing circuit is supplied with a supply voltage which is substantially independent of the data content of the digital signal. Signal distortion and signal crosstalk are thus avoided, even in the case of a low Power Supply Rejection Ratio of the data processing circuit.
  • An example of an electronic data processing circuit is a so-called DA converter which converts the digital signal into an analog signal.
  • Fig. 1 shows a known electronic circuit with a data processing circuit
  • Fig. 2 is a circuit diagram of an electronic circuit according to the invention
  • Fig. 3 is a circuit diagram of a first embodiment of a current compensation circuit for use in the electronic circuit of Fig. 2
  • Fig. 4 is a circuit diagram of a second embodiment of a current compensation circuit for use in the electronic circuit of Fig. 2
  • Fig. 1 shows a known electronic circuit with a data processing circuit
  • Fig. 2 is a circuit diagram of an electronic circuit according to the invention
  • Fig. 3 is a circuit diagram of a first embodiment of a current compensation circuit for use in the electronic circuit of Fig. 2
  • Fig. 4 is a circuit diagram of a second embodiment of a current compensation circuit for use in the electronic circuit of Fig. 2
  • Fig. 5 is a circuit diagram of an embodiment of a DA converter for use in the electronic circuit of Fig. 2. Equivalent components or elements have been given the same reference symbols in these Figures.
  • Fig. 1 shows a known electronic circuit with a data processing circuit DCR.
  • a first supply connection point 1 of the data processing circuit DCR is connected to a first supply connection terminal Nss of the electronic circuit.
  • a second supply connection point 2 of the data processing circuit DCR is connected to a second supply connection terminal VD D of the electronic circuit.
  • a supply voltage Ui is connected between the first supply connection terminal Nss and the second supply connection terminal N DD .
  • Parasitic wiring impedances between the connection point 1 and the first supply connection terminal Nss and between the connection point 2 and the second supply connection terminal V DD are referenced Z ⁇ and Z 12 , respectively.
  • the data processing circuit DCR receives a digital input signal DS.
  • the current consumption ID C R of the data processing circuit DCR in general comprises a component which is dependent on the digital input signal DS.
  • the presence of the parasitic wiring impedances Z ⁇ and Z_ ⁇ thus gives rise to an effective supply voltage U with a component which is dependent on the digital input signal DS.
  • the data processing circuit DCR has an insufficiently high Power Supply Rejection Ratio, a signal distortion will arise owing to the data-dependent component in the effective supply voltage U 2 , and possibly also signal crosstalk to other parts of the electronic circuit.
  • Fig. 2 shows an electronic circuit according to the invention with a data processing circuit DCR as shown in Fig. 1, with added thereto a current compensation circuit CMP.
  • the digital signal DS is supplied not only to the data processing circuit DCR but also to the current compensation circuit CMP.
  • the supply lines of the current compensation circuit CMP are not connected to the first supply connection terminal Nss and the second supply connection terminal N DD , but are connected to the first supply connection point 1 and the second supply connection point 2, respectively.
  • the current consumption of the current compensation circuit CMP is referenced I CMP -
  • the value of I C MP preferably lies much lower than the value of I DC R, SO that the total current consumption of the electronic circuit is not appreciably increased.
  • the current compensation circuit CMP is designed such that the current consumption I CMP comprises a data-dependent component which is of the same magnitude as the data-dependent component of the current consumption I DCR of the data processing circuit DCR, but in opposite phase.
  • Fig. 5 shows a DA converter DAC as an example of a data processing circuit DCR.
  • the DA converter DAC comprises switching means S C NV and conversion resistors R C N V O to R C NV ⁇ -
  • the switching means S C NV comprise switches which are controlled by the digital signals DS, which are referenced ao to a n .
  • the DA converter DAC supplies an analog output signal U O U T to an output terminal OUT of the DA converter DAC.
  • the conversion resistors are connected either between the first connection point 1 and the output terminal OUT or between the second supply connection point 2 and the output terminal OUT in dependence on the logic values of the signals ao to a n .
  • Fig. 5 shows the situation, by way of example, in which the conversion resistors RC N V O and R C NVI are connected between the second supply connection point 2 and the output terminal OUT.
  • the current consumption I DCR of the DA converter DAC is a minimum when all conversion resistors R C NV O to R C NV ⁇ are connected either between the first supply connection point 1 and the output terminal OUT or between the second supply connection point 2 and the output terminal OUT.
  • the current consumption I DCR is greater in all other cases.
  • the current consumption I DCR is a maximum when an equal number of conversion resistors is connected between the first supply connection point 1 and the output terminal OUT and between the second supply connection point 2 and the output terminal OUT. All this is subject to the assumption that all conversion resistors have substantially the same value.
  • the current consumption I DC R is accordingly dependent on the value of the digital signal DS.
  • Fig. 4 shows an example of a current compensation circuit CMP which in this example comprises three compensation resistors which are referenced R CMPI to R C M P3 -
  • the current compensation circuit CMP further comprises switching means S CMP which are controlled by the digital signal DS.
  • a number of compensation resistors are or are not connected between the first supply connection point 1 and the second supply connection point 2.
  • the current consumption I CM P depends on the digital signal DS. Given a correct mutual dimensioning of the DA converter DAC and the current compensation circuit CMP, therefore, the sum of the current consumption values I DCR and I C M P will be constant.
  • the output terminal OUT is unloaded, the number of conversion resistors of Fig. 5 is equal to 4 and the number of compensation resistors of Fig. 4 is equal to 4, the supply voltage is 3 volts, the value of the conversion resistors is 30 k ⁇ , and the value of the compensation resistors is 120 k ⁇ .
  • Two situations will now be discussed. In situation 1, two conversion resistors are connected between the first supply connection point 1 and the output terminal OUT, and two conversion resistors are connected between the second supply connection point 2 and the output terminal OUT.
  • the output voltage Uou ⁇ is equal to 1.5 volts.
  • the total resistance connected between the first supply connection point 1 and the second supply connection point 2 is equal to 30 k ⁇ .
  • the current consumption ID CR is 100 ⁇ A.
  • Three compensation resistors with a value of 120 k ⁇ each are also connected in the current compensation circuit CMP between the first supply connection point 1 and the second supply connection point 2. This makes the current consumption I CM P equal to 75 ⁇ A.
  • the sum of the current consumption values I D C R and I CMP is equal to 175 ⁇ A as a result.
  • one conversion resistor is connected between the second supply connection point 2 and the output terminal OUT, and three conversion resistors are connected between the first supply connection point 1 and the output terminal OUT.
  • the output voltage U O U T is equal to 0.75 volt.
  • the total resistance between the first supply connection point 1 and the second supply connection point 2 of the DA converter DAC is equal to 40 k ⁇ .
  • four compensation resistors of 120 k ⁇ are connected in the current compensation circuit CMP between the first supply connection point 1 and the second supply connection point 2.
  • the current consumption I CM P is equal to 100 ⁇ A.
  • the total current consumption is accordingly equal to 175 ⁇ A.
  • a current compensation circuit CMP may alternatively be used comprising current sources as indicated in Fig. 3.
  • Fig. 3 shows by way of example three compensation current sources I CMP I to I CMP3 which are connected between the first supply connection point 1 and the second supply connection point 2.
  • the compensation current sources supply a certain reference current, or one or several compensation current sources are switched off, in dependence on the data content of the digital signal DS.
  • the current compensation circuit CMP as shown in Fig.
  • the current compensation circuit CMP as shown in Fig.4, it is also possible not to make the number of compensation resistors R CMPI - R CMP3 connected between the first supply connection point 1 and the second supply connection point 2 dependent on the data content of the digital signal DS, but to connect only one of the compensation resistors R CMPI - R CMP3 between the first supply connection point 1 and the second supply connection point 2 at any time, the value of said one compensation resistor R C M PI - RCM P3 being dependent on the data content of the digital signal DS.
  • the electronic circuit may be built up from discrete components or be implemented in an integrated circuit. Transistors may be used for the compensation current sources, for example bipolar transistors or field effect transistors.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Amplifiers (AREA)

Abstract

Electronic circuitry comprising a data processing circuit for processing a digital signal (DS), such as a digital to analog converter (DAC), and a current compensation circuit (CMP). Both the digital to analog converter (DAC) and the current compensation circuit (CMP) are powered by a single power supply (U1). The current taken from the power supply (U1) by the digital to analog converter (DAC) is normally dependent on the digital input signal (DS). This would lead to distortion since the loss-resistances (Rl1, Rl2) which are always present in series with the power supply (U1) then feed a data-dependent supply voltage (U2) to the digital to analog converter (DAC). This problem is overcome by the addition of the current compensation circuit (CMP) which is coupled for receiving the digital signal (DS). The current compensation circuit (CMP) is arranged in such a way that the sum of the data-dependent current drawn by the digital to analog converter (DAC) and the data-dependent current drawn by the compensation circuit (CMP) is substantially independent of the data.

Description

Means for compensating a data-dependent supply current in an electronic circuit
The invention relates to an electronic circuit comprising a data processing circuit for processing a digital signal, which data processing circuit is coupled between a first supply connection terminal and a second supply connection terminal for receiving a supply voltage. Such an electronic circuit is known from the general prior art. In general, the current consumed by the data processing circuit is dependent on the data content of the digital signal. A certain wiring impedance (ohmic resistance and self-inductance) is always present in series with the supply lines of the data processing circuit. Owing to the presence of this wiring impedance, and owing to the fact that the current consumed by the data processing circuit is dependent on the data content of the digital signal, the data processing circuit is supplied with a voltage which has a data-dependent component. The so-called Power Supply Rejection Ratio of an electronic circuit is always finite, so that distortion of signals will arise in the data processing circuit in dependence on the value of the Power Supply Rejection Ratio. In addition, an undesirable signal crosstalk may arise to other parts of the electronic circuit. Efforts are made in practice to limit this signal distortion and signal crosstalk by designing the data processing circuit such that the Power Supply Rejection Ratio is a maximum. Efforts are further made to minimize the wiring impedance present. These measures, however, are not always sufficient. Moreover, these measures may have the result that the implementation of the data processing circuit is very complicated. It is also possible that such an implementation, in which a high Power Supply Rejection Ratio is sought after, will have a negative impact on other quality aspects.
It is accordingly an object of the invention to provide an electronic circuit with a data processing circuit which does not have the above disadvantages, or at least to a very low degree. According to the invention, the electronic circuit mentioned in the opening paragraph is for this purpose characterized in that the electronic circuit comprises a current compensation circuit which is coupled between the first supply connection terminal and the second supply connection terminal for receiving the supply voltage, which current compensation circuit in the operational state is controlled from the digital signal such that the sum of the current consumption of the data processing circuit and the current consumption of the current compensation circuit is substantially independent of the data content of the digital signal.
Both the data processing circuits and the current compensation circuit have a current consumption which is data-dependent. The data-dependent component of the current consumption of the current compensation circuit has the same magnitude as the data- dependent component of the current consumption of the data processing circuit. The two said current components, however, are in counter-phase. Since the supply connection points of the data processing circuit and of the current compensation circuit are interconnected by means of a very short wiring, there will be substantially no data-dependent current through the wiring impedances. This is because the data-dependent component of the data processing circuit and the data-dependent component of the current compensation circuit compensate one another. The result of this is that the data processing circuit is supplied with a supply voltage which is substantially independent of the data content of the digital signal. Signal distortion and signal crosstalk are thus avoided, even in the case of a low Power Supply Rejection Ratio of the data processing circuit.
An example of an electronic data processing circuit is a so-called DA converter which converts the digital signal into an analog signal.
Advantageous embodiments of current compensation circuits for use in the electronic circuit according to the invention are specified in claims 3 to 6. An advantageous embodiment of a DA converter for use in an electronic circuit according to the invention is specified in claim 7.
The invention will be explained in more detail with reference to the accompanying drawing, in which:
Fig. 1 shows a known electronic circuit with a data processing circuit, Fig. 2 is a circuit diagram of an electronic circuit according to the invention, Fig. 3 is a circuit diagram of a first embodiment of a current compensation circuit for use in the electronic circuit of Fig. 2, Fig. 4 is a circuit diagram of a second embodiment of a current compensation circuit for use in the electronic circuit of Fig. 2, and
Fig. 5 is a circuit diagram of an embodiment of a DA converter for use in the electronic circuit of Fig. 2. Equivalent components or elements have been given the same reference symbols in these Figures.
Fig. 1 shows a known electronic circuit with a data processing circuit DCR. A first supply connection point 1 of the data processing circuit DCR is connected to a first supply connection terminal Nss of the electronic circuit. A second supply connection point 2 of the data processing circuit DCR is connected to a second supply connection terminal VDD of the electronic circuit. A supply voltage Ui is connected between the first supply connection terminal Nss and the second supply connection terminal NDD. Parasitic wiring impedances between the connection point 1 and the first supply connection terminal Nss and between the connection point 2 and the second supply connection terminal VDD are referenced Zπ and Z12, respectively. The data processing circuit DCR receives a digital input signal DS. The current consumption IDCR of the data processing circuit DCR in general comprises a component which is dependent on the digital input signal DS. The presence of the parasitic wiring impedances Zπ and Z_< thus gives rise to an effective supply voltage U with a component which is dependent on the digital input signal DS. Now if the data processing circuit DCR has an insufficiently high Power Supply Rejection Ratio, a signal distortion will arise owing to the data-dependent component in the effective supply voltage U2, and possibly also signal crosstalk to other parts of the electronic circuit. Fig. 2 shows an electronic circuit according to the invention with a data processing circuit DCR as shown in Fig. 1, with added thereto a current compensation circuit CMP. The digital signal DS is supplied not only to the data processing circuit DCR but also to the current compensation circuit CMP. The supply lines of the current compensation circuit CMP are not connected to the first supply connection terminal Nss and the second supply connection terminal NDD, but are connected to the first supply connection point 1 and the second supply connection point 2, respectively. The current consumption of the current compensation circuit CMP is referenced ICMP- The value of ICMP preferably lies much lower than the value of IDCR, SO that the total current consumption of the electronic circuit is not appreciably increased. The current compensation circuit CMP is designed such that the current consumption ICMP comprises a data-dependent component which is of the same magnitude as the data-dependent component of the current consumption IDCR of the data processing circuit DCR, but in opposite phase. As a result, the effective supply voltage U2 contains substantially no data-dependent component. The electronic circuit of Fig. 2 is now explained in more detail with reference to Figs. 3, 4, and 5. Fig. 5 shows a DA converter DAC as an example of a data processing circuit DCR. The DA converter DAC comprises switching means SCNV and conversion resistors RCNVO to RCNVΠ- The switching means SCNV comprise switches which are controlled by the digital signals DS, which are referenced ao to an. The DA converter DAC supplies an analog output signal UOUT to an output terminal OUT of the DA converter DAC. The conversion resistors are connected either between the first connection point 1 and the output terminal OUT or between the second supply connection point 2 and the output terminal OUT in dependence on the logic values of the signals ao to an. Fig. 5 shows the situation, by way of example, in which the conversion resistors RCNVO and RCNVI are connected between the second supply connection point 2 and the output terminal OUT. The current consumption IDCR of the DA converter DAC is a minimum when all conversion resistors RCNVO to RCNVΠ are connected either between the first supply connection point 1 and the output terminal OUT or between the second supply connection point 2 and the output terminal OUT. The current consumption IDCR is greater in all other cases. The current consumption IDCR is a maximum when an equal number of conversion resistors is connected between the first supply connection point 1 and the output terminal OUT and between the second supply connection point 2 and the output terminal OUT. All this is subject to the assumption that all conversion resistors have substantially the same value. The current consumption IDCR is accordingly dependent on the value of the digital signal DS. Fig. 4 shows an example of a current compensation circuit CMP which in this example comprises three compensation resistors which are referenced RCMPI to RCMP3- The current compensation circuit CMP further comprises switching means SCMP which are controlled by the digital signal DS. Depending on the digital signal DS, a number of compensation resistors are or are not connected between the first supply connection point 1 and the second supply connection point 2. It will be obvious that the current consumption ICMP depends on the digital signal DS. Given a correct mutual dimensioning of the DA converter DAC and the current compensation circuit CMP, therefore, the sum of the current consumption values IDCR and ICMP will be constant.
To clarify the manner of dimensioning, the following assumptions will now be made. The output terminal OUT is unloaded, the number of conversion resistors of Fig. 5 is equal to 4 and the number of compensation resistors of Fig. 4 is equal to 4, the supply voltage is 3 volts, the value of the conversion resistors is 30 kΩ, and the value of the compensation resistors is 120 kΩ. Two situations will now be discussed. In situation 1, two conversion resistors are connected between the first supply connection point 1 and the output terminal OUT, and two conversion resistors are connected between the second supply connection point 2 and the output terminal OUT. The output voltage Uouτ is equal to 1.5 volts. The total resistance connected between the first supply connection point 1 and the second supply connection point 2 is equal to 30 kΩ. The current consumption IDCR is 100 μA. Three compensation resistors with a value of 120 kΩ each are also connected in the current compensation circuit CMP between the first supply connection point 1 and the second supply connection point 2. This makes the current consumption ICMP equal to 75 μA. The sum of the current consumption values IDCR and ICMP is equal to 175 μA as a result.
In situation 2, one conversion resistor is connected between the second supply connection point 2 and the output terminal OUT, and three conversion resistors are connected between the first supply connection point 1 and the output terminal OUT. The output voltage UOUT is equal to 0.75 volt. The total resistance between the first supply connection point 1 and the second supply connection point 2 of the DA converter DAC is equal to 40 kΩ. This makes the current consumption IDCR equal to 75 μA. At the same time, four compensation resistors of 120 kΩ are connected in the current compensation circuit CMP between the first supply connection point 1 and the second supply connection point 2. As a result, the current consumption ICMP is equal to 100 μA. The total current consumption is accordingly equal to 175 μA.
It will be obvious from the above that the sum of the current consumption values IDCR and ICMP is constant, and is equal to 175 μA in this example.
Instead of a current compensation circuit CMP with resistors as shown in Fig. 4, a current compensation circuit CMP may alternatively be used comprising current sources as indicated in Fig. 3. Fig. 3 shows by way of example three compensation current sources ICMPI to ICMP3 which are connected between the first supply connection point 1 and the second supply connection point 2. The compensation current sources supply a certain reference current, or one or several compensation current sources are switched off, in dependence on the data content of the digital signal DS. As an alternative to the current compensation circuit CMP as shown in Fig. 3, it is possible not to make the number of switched-on compensation current sources ICMPI - ICMP3 dependent on the data content of the digital signal DS, but to switch on only one of the compensation current sources ICMPI - ICMP3 at any time, the value of the current supplied by the one switched-on compensation current source ICMPI - ICMP3 being dependent on the data content of the digital signal DS.
As an alternative to the current compensation circuit CMP as shown in Fig.4, it is also possible not to make the number of compensation resistors RCMPI - RCMP3 connected between the first supply connection point 1 and the second supply connection point 2 dependent on the data content of the digital signal DS, but to connect only one of the compensation resistors RCMPI - RCMP3 between the first supply connection point 1 and the second supply connection point 2 at any time, the value of said one compensation resistor RCMPI - RCMP3 being dependent on the data content of the digital signal DS. The electronic circuit may be built up from discrete components or be implemented in an integrated circuit. Transistors may be used for the compensation current sources, for example bipolar transistors or field effect transistors.

Claims

CLAIMS:
1. An electronic circuit comprising a data processing circuit (DCR) for processing a digital signal (DS), which data processing circuit (DCR) is coupled between a first supply connection terminal (Vss) and a second supply connection terminal (VDD) for receiving a supply voltage (U , characterized in that the electronic circuit comprises a current compensation circuit (CMP) which is coupled between the first supply connection terminal (Vss) and the second supply connection terminal (VDD) for receiving the supply voltage (UO, which current compensation circuit CMP) in the operational state is controlled from the digital signal (DS) such that the sum of the current consumption (IDCR) of the data processing circuit (DCR) and the current consumption (ICMP) of the current compensation circuit (CMP) is substantially independent of the data content of the digital signal (DS).
2. An electronic circuit as claimed in claim 1, characterized in that the data processing circuit (DCR) is a DA converter (DAC) for converting the digital signal (DS) into an analog signal (UOUT)-
3. An electronic circuit as claimed in claim 2, characterized in that the current compensation circuit (CMP) comprises compensation current sources (ICMPI - ICMP3) which are coupled between the first supply connection terminal (Nss) and the second supply connection terminal (VDD), number of said compensation current sources (ICMP3) being switched on in the operational state, said number being dependent on the data content of the digital signal (DS).
4. An electronic circuit as claimed in claim 2, characterized in that the current compensation circuit (CMP) comprises compensation resistors (RCMPI - RCMP3)> number of said compensation resistors (RCMP3) being coupled between the first supply connection terminal (Vss) and the second supply connection terminal (VDD) in the operational state, said number being dependent on the data content of the digital signal (DS).
5. An electronic circuit as claimed in claim 2, characterized in that the current compensation circuit (CMP) comprises compensation current sources (ICMPI - ICMP3) which are coupled between the first supply connection terminal (Nss) and the second supply connection terminal (VDD), one of said compensation current sources (ICMPI - ICMP3) being switched on in the operational state, the value of the current supplied by said switched-on current sources (ICMPI - ICMP3) being dependent on the data content of the digital signal (DS).
6. An electronic circuit as claimed in claim 2, characterized in that the current compensation circuit (CMP) comprises compensation resistors (RCMPI - RCMB one of said compensation resistors (RCMPI - RCMP3) being coupled between the first supply connection terminal (Nss) and the second supply connection terminal (VDD) in the operational state, the value of said one compensation resistor (RCMPI - CMP3) being dependent on the data content of the digital signal (DS).
7. An electronic circuit as claimed in claim 2, 3, 4, 5, or 6, characterized in that the DA converter (DAC) comprises conversion resistors (RCΝVO - RCΝVΠ a number of said conversion resistors (RCΝV2 - RCNVΠ) being coupled between the first supply connection terminal (Nss) and an output terminal (OUT) of the DA converter (DAC) in the operational state, while the remaining number of conversion resistors (RCΝVO - RCΝVI) is coupled between the second supply connection terminal (VDD) and the output terminal (OUT), said number being dependent on the data content of the digital signal (DS).
PCT/EP2001/010660 2000-09-27 2001-09-14 Means for compensating a data-dependent supply current in an electronic circuit WO2002027940A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE60128403T DE60128403T2 (en) 2000-09-27 2001-09-14 MEANS FOR COMPENSATING A DATA-DEPENDENT SUPPLY CURRENT IN ELECTRONIC CIRCUIT
JP2002531613A JP2004510381A (en) 2000-09-27 2001-09-14 Means for compensating data-dependent power supply currents in electronic circuits
KR1020027006656A KR20020060753A (en) 2000-09-27 2001-09-14 Means for compensating a data-dependent supply current in an electronic circuit
EP01969719A EP1380113B1 (en) 2000-09-27 2001-09-14 Means for compensating a data-dependent supply current in an electronic circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP00203347.0 2000-09-27
EP00203347 2000-09-27

Publications (2)

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WO2002027940A2 true WO2002027940A2 (en) 2002-04-04
WO2002027940A3 WO2002027940A3 (en) 2003-11-06

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US (1) US6501401B2 (en)
EP (1) EP1380113B1 (en)
JP (1) JP2004510381A (en)
KR (1) KR20020060753A (en)
AT (1) ATE362228T1 (en)
DE (1) DE60128403T2 (en)
WO (1) WO2002027940A2 (en)

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WO2009001308A2 (en) * 2007-06-27 2008-12-31 Nxp B.V. Dac with data independent common mode dynamics
EP2226943A3 (en) * 2009-03-05 2012-11-14 Yamaha Corporation Correction circuit for D/A converter
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US20020047792A1 (en) 2002-04-25
EP1380113B1 (en) 2007-05-09
EP1380113A2 (en) 2004-01-14
US6501401B2 (en) 2002-12-31
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ATE362228T1 (en) 2007-06-15
DE60128403D1 (en) 2007-06-21

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