SU1129559A1 - Device for checking rate of raise of output voltage of analog integrated circuits - Google Patents

Abstract

DEVICE FOR MONITORING Slew Rate ANALOG INTEGRATED CIRCUITS, soderl5a1dee generator of rectangular pulses, the output of which is connected to the first output terminal of the device for amplitude meter having an input connected to vhodnoy.klemme device, characterized in that s.tselyu simplify the device, It has a voltage comparator, a voltage source, a gate pulse driver and a second output terminal, the first input of the voltage comparator is connected to the input terminal of the device Twa, the second input - to a source of reference voltage, and an output - to the second You are a Khodnev. The input of the gate driver is connected to the output of the square pulse generator, and the output to the gated input of the voltage comparator.

Description

The invention relates to electrical measuring technology and can be used in automated gauges of the parameters of analog integrated circuits.

A device is known for controlling the rate of rise of the output voltage of analog integrated circuits, comprising a measuring unit, three counters, a multi-input coincidence element, a main and additional triggers, two AND elements and a pulse generator, the output of which is connected to the first inputs of the And elements, output.the additional the trigger is connected to the second input of the first element I / the first input to the output of the multi-input matching element, and the second input to the first input of the first counter, the first output of the measuring unit the first input of the primary latch, the second input of which is connected to the second output of the measuring unit, and an output - through the second element and to the input of a second. the counter, the output of the first element I is connected to the second input of the first one, the counter and to the input of the third counter, the outputs of the first and second meters are connected to the inputs of the multi-input coincidence element l.

The disadvantage of this device is its complexity, due to the presence of a complex measuring unit.

The closest in technical essence to the present invention is a device for monitoring the rate of rise of the output voltage of analog integrated circuits, comprising a generator of rectangular pulses, the output of which is connected to the output terminal of the device, an amplitude meter and a time interval meter whose inputs are combined and connected to the input terminal device 2J.

The disadvantage of this device is its complexity, due to the presence of a complex meter. time intervals.

The purpose of the invention is to simplify the device.

The goal is achieved by the fact that a voltage comparator, a source, is inputted to a device for monitoring the rise rate of the output voltage of analog integrated circuits, which contains a square pulse generator, the output of which is connected to the first output terminal of the device and an amplitude meter, whose input is connected to the input terminal of the device. a gate voltage, a strobe pulse generator and a second output terminal, the first input of the voltage comparator is connected to the input terminal of the device, the second

the input is to the source of the reference voltage, and the output is to the second output terminal, the input of the strobe pulse shaper is connected to the output of the square-wave generator, and the output to the gated input of the voltage comparator.

Figure 1 shows a block diagram of a device for controlling the rate of rise of the output voltage of analog integrated circuits; 2, timing diagrams for the operation of the device.

The device contains a generator of 1 rectangular pulses, the output of which is connected to the first output terminal of the device 2, a 3 amplitude meter connected to the input terminal of the device 4, a voltage comparator 5, the first input of which is connected to the input 4, the second input to the source b is the reference for: voltage, and the output is to the second output terminal 7 of the device, the strobe pulse shaper 8, whose input is connected to the output of the square pulse generator 1, and the output to the gated input of the comparator 5 ex. wives The monitored analog integrated circuit 9 is connected by input to output terminal 2, and output O to input terminal 4 of the device.

The device works as follows.

On the generator 1 of the rectangular pulses is set the duration

5 pulses (figa)

 - O / J-UA

(1) -and

where and. - the amplitude of the input pulses of the generator 1;

V is the minimum rate of rise of the output voltage of the controlled circuit. The pulse shape and its amplitude. At the output of the integrated circuit 9 depends on the pulse duration of the rectangular pulse generator 1 and the output voltage rate of the circuit itself.

The output voltage of the integrated circuit 9

i- ft0-t K, p

U "COnet OK

you"

-KUft.t,,

where t is time)

id - the amplitude of the ampule}

K is a coefficient estimating 60 the rate of decay of the output voltage,

At the output of the integrated circuit 9, a pulse of either trapezoidal or triangular shape 65 is formed (FIG. 2E5). The strobe pulse shaper 8 outputs a pulse to the voltage comparator 5, thereby determining the moment of comparison (Lig.2c). The level of comparison is determined by the magnitude of the reference voltage supplied to the comparator 5 from source 6.

To determine the level of the reference voltage Ugp, it is necessary to feed the input of the integrated circuit 9 from the generator 1 of rectangular pulses with a pulse of such duration that a pulse of the required trapezoidal shape is formed at the output of circuit 9, and measure the amplitude of the pulses Uft with the help of a meter 3 The second input of the voltage comparator 5 sets the reference voltage fUonI (Uftl.

If the slew rate of the output voltage 9 is less than the one given by expression (1), then a triangular pulse of smaller amplitude is formed at the output of circuit 9 than the voltage comparator 5 () ig.2g) does not output to the output terminal 7pulse (Fig.2g) .

Simplification of the device is achieved by introducing a voltage comparator, a reference voltage source, a gate stator and a second output terminal, which are generally much simpler than the time interval meter,

In addition, the simplification of the device allows to simplify and automate the process of checking or measuring the rate of rise of the output voltage of analog ICs.

FIG. 2

Claims (1)

A DEVICE FOR CONTROLING THE SPEED OF THE OUTPUT VOLTAGE OF ANALOGUE INTEGRAL CIRCUITS, comprising a rectangular pulse generator, the output of which is connected to the first output terminal of the device, an amplitude meter, the input of which is connected to the input terminal of the device, characterized in that, p. In order to simplify the device, a voltage comparator, a reference voltage source, a strobe-pulse generator and a second output terminal are introduced into it, the first input of the voltage comparator connected to the input terminal of the device, the second input to the voltage reference source, and the output to the second output . the terminal, the input of the Strobe pulse former is connected to the output of the rectangular pulse generator, and the output is connected to the gated input of the voltage comparator Vut.f Sllm. 1129559. A 1129559 '