SU1649475A1 - Ic current consumption monitoring unit - Google Patents

Abstract

The invention relates to a control and measuring technique and can be used to control the current consumption of an integrated circuit without soldering from a printed circuit board. The purpose of the invention is to improve the accuracy of control of current consumption by eliminating the influence of fluctuations in the values of current in the power bus on the result of the control. The device for monitoring the current consumption of the integrated circuit 1 contains a DC meter 2, terminals 3 and 18, respectively, for connecting to the power output and to the common output, power supply 4, sinusoidal oscillator 5, modulators 6, 7, pulse generator 8, inverted - torus 9, coils 10,16 inductive, generators 11,17 noise, resonant amplifier 12, phase detector 13, quadratic detector 14, voltmeter 15. By introducing sinusoidal oscillator 5, modulators 6,7, pulse generator 8, inverter 9 coils 10.16 induk Generators 11, 17 of noise, resonant amplifier 12, phase quadratic 14 detectors, voltmeter 15 exclude direct contact and effects on the current flow circuit, which reduces the effect of fluctuations in the value of current in the power supply bus on the result of control and increases its accuracy. 1 il.

Description

The invention relates to a measurement technique and can be used to control the current consumption of the integrated circuit without evaporating from the printed circuit board.

The purpose of the invention is to increase the accuracy of monitoring the current consumption by eliminating the influence of fluctuations in the current values in the power bus on the result of the control.

The drawing shows a diagram of the device. A device for monitoring the consumption current of an integrated circuit (IC) 1 contains a direct current meter 2. terminal 3 for connecting to a power output, a power source 4, a sine wave generator 5, the first 6 and second 7 modulators, an 8 pulse generator, an inverter 9. the first coil 10 induction, the first noise generator 11, a resonant amplifier 12, a phase detector 13, a quadratic detector 14, a voltmeter 15, a second inductor 16, a second noise generator 17, a terminal 18 for connecting to a common output. Also shown is a printed circuit board 19 with a common bus 20, on which, in addition to IP 1, other ICs 21,22,23 are installed. Inductors 10,16 are installed near the printed conductor 24 of the board 19, connecting the common output of the IC 1 with a common bus 20.

The first output of the power supply 4 is connected through a DC meter 2 to a terminal 3 for connecting to a power output, the second output is connected through a sine wave generator 5 to a terminal 18 for connecting a common output, and directly to the first input of a phase detector 13 connected by a quadratic output the detector 14 with the input of the voltmeter 15, the second input with the output of the resonant amplifier 12 connected to the first input through the first inductor 10 with the first input of the first noise generator 11 connected to the second input through the first modulator 6 with the output of the pulse generator 8, connected through the inverter 9 to the input of the second modulator 7, connected by the output to the first input of the second noise generator 17, connected by the first and second outputs corresponding to the first and second terminals of the second inductor 16, the second input of the resonant amplifier 12 is connected to the output of the first noise generator 11.

The device operates as follows. In accordance with the scheme, the test IC 1 can be considered active resistance, therefore, the constant and variable points in the conductor 24 are related as the voltage (EMF) of the power supply 4 and generator 5, respectively. This follows directly from Ohm's law. In this case, the source 4 and the generator 5 are selected so that the total effect of the instability of the source 4 and the amplitude values of the signal of the generator 5 would not lead to the output of the instantaneous value of the supply voltage of the IC 1.21, 22, 23 beyond the limits provided for by the technical conditions for these ICs .

The direct current generated by the power supply 4 is distributed between the IP 1, 21, 22, 23; D.C. consumed 15 investigated IP 1 is equal

1ism = A ·, (1) where A is the current meter 2 readings equal to the current value of the power supply 4;

K1 is a coefficient showing how much of the current is consumed by the investigated IC 1.

To find the coefficient K1, the effect on the power supply bus of the IC 1 of an alternating sinusoidal current from 2 ^ generator 5 is used, the amplitude of the oscillations is significantly less than the value of 1 s. Alternating current of generator 5, passing through conductor 24 (through circuit 1), induces a sinusoidal voltage in coil 10. The power P _c allocated for the purpose of winding the coil 10 is proportional to the square of the amplitude of the alternating current flowing in the conductor 24 (taking into account that the conductor 35 24 and the coil 10 are respectively the primary and secondary windings of the transformer formed by them), since the amplitude of the alternating current the conductor 4Q 24 is proportional to the current portion K1 of the generator 5. which flows through this conductor, the following can be written.

The value of 1 ² ISM is proportional to the power emitted during the passage of alternating current through the conductor 24. A sinusoidal signal coming from the generator 5. induces a signal on the inductor 10 whose power is equal to

Pc - ΚΙ * · Κ2Ριχ. (2) where Pre is the power of the generator 5;

K2 is a constant coefficient for each measurement, depending on the design of the coil 10 or 16 and its location with respect to the conductor 24.

The signal from the coil 10 enters through the resonant amplifier 12 to the measuring input of the phase detector 13. to the other input of which the signal from the generator 11.

Amplifier 12 is a conventional resonant amplifier, characterized by a tuning frequency of 1 MHz and a bandwidth at half power level of 10 kHz. The use of a resonant amplifier allows one to realize a high power gain of 5.

In the first cycle of operation, the generator 8 through the modulator 6 starts the noise generator 11. When this generator 17 noise is turned off. since due to inverter 9, generators Yu 11 and 17 operate in antiphase.

The noise signal of the generator 11 is added to the sinusoidal signal from the coil 10 at the input of the amplifier 12.

Next, phase detection 15 is carried out using a phase detector 13 using the signal of the generator 5.

It is known from (1) that as a result of sequential phase detection with subsequent supply to the quadratic detector 14, its output voltage a will be: а = КЗ / (Р _с / Р _Ш 1) = КЗ / (Ргс К1 ² Κ2 / Ρ _ω ι ), (3) where K3 = mnV, m is the slope of the phase detector 13: η is the slope of the quadratic detector 14; V is the passband of the resonant amplifier 12; "·

R _W 1 ^_ power generator 11 noise;

Re is the signal power (1).

In the second clock cycle of the device, the generator 8 through the modulator 6 turns off the generator 11, and through the inverter 9 and the modulator 7 turns off the generator 17. In this case, the noise power 35 of the generator 17 is transmitted through the coil 16 first to the conductor 24, and then from the conductor 24 to the coil 10. In this case, the direct inductive coupling of the coils 16 and 10 is excluded by magnetic shielding. dd

When transmitting the noise power of the generator 17 to the circuit of the amplifier 12, this power decreases in the conductor 24 by a factor of K2 and a second decrease in the coil 10 by another K2 times. Therefore, the voltage value 45 at the output of the detector 14 will be in this case

B = KZ / (P _s / Psh2K2K2) (4)

Dividing (3) by (4), we obtain the expression for finding K2: 50 a / b - = (Р _Ш 1 / Рш2 -) (1 / К ² 2) (5)

Find K2: _________

K2 = (b / a) (Psh1 / Psh2)

From relation (3) we find K1:

Ж, = ^ν (KZ / a) (Р _Ш 1 / Ргс) (1 / · / (6/3) (Р _Ш 1 / (7) Knowing K1 and reading A of meter 4 from relation (1) we will determine _____________ h = A \ C3 / a) (Pmt / Pgc) (1 / V (b / a) (P _W T (8)

Thus, the proposed device provides a determination of the current consumption of the integrated circuit 1 without direct contact and the impact on the current flow circuit. This reduces the influence of fluctuations in the current value in the power bus on the control result and increases its accuracy.

Claims (1)

Claim A device for controlling the current consumption of integrated circuits containing a power source connected to the first output through a DC meter with a terminal for connection to the power terminal, a terminal for connection to a common terminal, characterized in that, in order to improve the control accuracy, a sinusoidal generator is inserted into it oscillations, two modulators, pulse generator, two inductors, phase detector, quadratic detector, inverter, resonant amplifier, two noise generators, voltmeter, and the second output source The power supply is connected via a sinusoidal oscillator to a terminal for connecting a common output, and directly to the first input of a phase detector connected by an output through a quadratic detector to the input of a voltmeter, the second input to the output of a resonant amplifier connected to the first input of a first inductor by a first inductor a noise generator connected by a second input through a first modulator to an output of a pulse generator connected via an inverter to an input of a second modulator. connected to the output of the first input of the second noise generator, connected to the first and second outputs, respectively, of the first and second terminals of the second inductance, the second input of the resonant amplifier is connected to the output of the first noise generator.