SU782144A1 - Device for automatic testing of analogue-digital converters - Google Patents

Description

This invention relates to a measurement technique. A device for testing analog-to-digital converters is known. The source contains an input signal whose output is connected to the first inputs of an exemplary and verifiable analog-digital converters and through a frequency multiplier is connected to the first input of a valve, the second input of which is connected to the trigger output to the first input of which is connected to the counter output, and the second input is connected to the first input of the switch, the second output of which is connected to the first input of the OR element, and the input through the button is connected to the input bus device and, the second input of the OR gate is connected to. the output of the valve and the input of the first frequency division, the output of which is connected to the counter input, the output of the OR element is connected to the second inputs of the tested and sample analog-digital converters and the output of the frequency divider is connected to the inputs of the registering device Sch However, this device does not automate the calculation of the error. A device for checking analog-to-digital converters is known, which contains an input signal generator, the output of which is connected to the inputs of the analog-digital converter and a digital voltmeter, the output of the digital-to-analog converter is connected to the input of an oscilloscope, the outputs of the analog-digital converter are connected to the input of the digital-analog converter and the digital comparator, the output of which is connected to the counter, the control unit and the pass code detector, the outputs of the code switch are connected to the digital comp At the detector, the code skip detector is connected to the indicator, the outputs of the clock generator are connected to the control unit, to the analog-to-fitsrovo-. A converter and a digital comparator, and the output of the control unit is connected to an input signal generator 23. However, this device does not allow to automatically detect code gaps at different slopes of the input signal and different signs, as well as the magnitude of errors at different points, to check the analog-digital

in static mode, the converter will record the beginning of the change process depending on the size of the input signal.

The purpose of the invention is to expand the functionality of the device.

This goal is achieved in that the device for automatic verification of analog-to-digital converters, contains an input signal generator, a digital voltmeter, a digital-to-analog converter, an oscilloscope, a tested analog-to-digital converter, a switch, a digital comparator, a pass detector with an indicator. at the output, the control unit, a reverse code B counter, an automatic and manual mode and start setting block, an analog comparator, a digital-to-analog converter, a line aderzhki comparator de.shifrator block forming forward and reverse bills, pulse generator, a reversible counter errors, delay line down counter error, the block mark forming derivative prohibition signal generating unit, the analog switch and an analog delay line switch switching. A code B reader, the input signal generator is connected to an analog switch. The output of the digital comparator code inequality is connected to the input of the pulse generator, the equality of the digital comparator code output is connected to the first input of the reverse code counter B, the error counter and the output of the error counter and the output The connection bus of the external recording device, the output of the signal, the comparison of the codes A and B of the digital comparator is connected to the first input of the prohibition signal generation unit, the first To the input of the reversible error counter and the output bus for connecting an external recording device, the output of the code B switch is accurate to the second input of the rotary counter of code B, the code output of which is connected to the code input of the control digital-analogue converter, the third input of the digital comparator and the input of the shaping direct module and reverse counting, and the sign output of the reverse counter of code B is connected to the sign input of the control digital-analog converter, the fourth input of the digital com Parameter and to the first input block of the formation of the sign of the derivative, the control output of the reversible counter of code B is connected to the input of the decoder, the outputs of which are connected to the code inputs of the analog switch, the control output. b.Poka.zadani automatic and manual modes for start-up is connected to the third.

782144

the input of the reversible counter of code B, the blocking output of the block of automatic and manual operation and start is connected to the fifth input of the digital comparator, the output of the control digital-analog converter is connected to the input of the delay line of the analog switch and to the first input of the analog comparator, the output of which is connected to the second the input of the analogue-digital converter to be tested and to the input of the comparator delay line, the first output of which is SUPPLY TO 6H to the sixth input of the digital comparator, and the second output to the second To the input of the control unit, the output of the direct and reverse counting unit is simultaneously connected to the second input of the derivative sign forming unit and the fourth input of the B code reversing counter, the output of the pulse generator is connected to the second input of the reversible error counter, to the third input of which the output is connected, the delay line reversible counter, the output of the sign forming unit of the derivative is connected to the second input of the prohibition signal generating unit, the output of which is connected to the second input of the analog th comparator, the analog switch output delay line connected to the analog switch rhodu whose output is connected simultaneously to the third input of the comparator and the input of the digital voltmeter.

The drawing shows a structural electrical circuit of the device.

The device contains an input signal generator 1, a digital voltmeter 2, a digital-to-analog converter 3, an oscilloscope 4, a verifiable analog-to-digital converter 5, a digital comparator 6, a switch 7 for code B, a reversible counter 8 for code B, a detector for automatic and manual modes and start-up, control unit 11, indicator 12, switch 13, analog comparator 14, control of digital-analogue converter 15, comparator delay line 16, decoder 17, direct and reverse counting unit 18, gene A pulse generator 19, a reversible error counter 20, a delay counter 21 delay line 21, a derivative sign forming unit 22, an analog comparator 24 generating a prohibition signal 23, an analog switch delay line 25.

The device for automatic verification of analog-digital converters operates as follows.

Claims (2)

Unit 10 set the desired mode of operation and start the device. The signal of the block 10 to the reversible counter 8 sets the selected mode of operation. In the manual mode of operation, the number B of the switch 7 enters the reversible counter 8. With the automatic mode of operation, the reversible counter 8 controls the signaling and forward counting of the unit 18 and for its start is performed by the signal of equality of the codes received from the digital comparator 6. The reversible counter 8, depending on the forward and reverse counting signals, from block 18 is switched to the addition or subtraction mode, respectively. When a signal of equality of codes A and B arrives, the reversible counter 8 changes its state by one, and the code B is fed to the control digital-to-analog converter 15, to the digital Comparator 6 and to block 22, and the signal of the sign of the code B is fed to the second inputs of the control digital-analog converter 15, digital comparator 6 and block 18. The control signal of the reversible counter 8 enters the decoder 17, the control signal of which sets the operation mode of the analog switch 24. The first signal of the decoder 17 connects the output The control analogue digital converter 15 via a line 25 of the input delay of the digital voltmeter 2, the tested analog-digital converter 5 and the analog comparator 14, and the other signals of the decoder 17 connect the corresponding voltages of the generator 1 to the voltmeter 2, the analog-digital checked; 5 and a comparator 14, in which a comparison is made between the voltage supplied via the analogue switch 24 and the voltage that comes directly from the control of the digital-analogue converter 15. If the voltage is equal to the presence of the enable signal at the inputs of the comparator comparator 14, the latter generates a trigger signal for the tested analog-digital converter 5, which simultaneously passes to the digital comparator line 16 16. The triggering analog-digital converter 5 generates a code A that arrives at digital comparator input b and simultaneously on the series-connected switch 13, digital-to-analog converter 3 and the oscilloscope 4. A signal arrives at the second input of the oscilloscope 4 This is from block 11 to synchronize the operation of the oscilloscope 4, which simultaneously arrives at the inputs of generator 1 to effect correction. Simultaneously with the signal of code A, from the checked analog-digital converter 5, the input of digital comparator b receives the signal of the sign of code L. The result is equalized to codes A and B in the form and comes from digital comparator b to the inputs of block 11, reversible counter 20 and block 23 the second input of which receives the sign of the derivative sign from block 22. The interdiction signal from block 23 acts on the analog comparator 14 in the event that the plus sign of the derivative coincides with the negative sign of the derivative with A B, prohibiting the generation of a signal at the trigger trigger input variable analog-to-digital converter 5. In the case of equality of codes A and B, a digital comparator b generates a signal arriving at external recording devices, a reversible counter 8, changing the value of code B located in it, by one, to the detector 9, I will block his work. Indicator 12 shows the absence of code skipping. Further, the equality signal simultaneously from the output of the computer b through line 21 enters the installation input of the reversible counter 20 and resets its readings. In case of inequality of codes A and B. digital comparator b generates a signal that triggers pulse generator 19, which generates a series of pulses arriving at the counting input of the reversible counter 20. By signals A B or A B, coming from digital comparator b, the eversive counter 20 starts work in the mode of addition or loading. In the reversible counter 20, the pulses are added or subtracted until digital comparator 6 produces a signal for equality of codes A and B from the verified analog-to-digital converter 5 and counter for counter 8. The signal for equality of codes from digital comparator b blocks the operation of the generator 19 to the reversible counter 20 stops. The error code, located in the counter 20, receives the rfa external recording device. The inequality signals A, B, and from the digital comparator b are fed to the external register of the device to determine the sign of the error. The signal from block 10 to the digital comparator b stops the device. Claims An apparatus for automatically checking analog-to-digital converters comprising an input signal generator, the input of which is connected to. The output of the control unit and the oscilloscope first stroke, the second input of which is connected through a serially connected digital-analogue converter 1 and a switch connected to the transducer; with hgp; ch yb (output output of the tested analog-digital converter and the first input of a digital comparator, the second of which is connected to - the second output of the tested analog-digital converter, the first input of which is connected to the input of a digital volt meter and the first input of the digital comparator is connected via a pass-code detector to the input indicator a, the output signal of the comparison of the codes A and B of the digital comparator is connected to the first input of the control unit, which is so that, with the purpose of expanding the functionality, a reversible counter of the code B, a block of setting the automatic and manual modes and , analogue comparator, control digital-to-analogue converter, comparator delay line, decoder, direct and reverse account blocking, pulse generator, reversible counter meter, delay line of reversible error counter, block forming Hovhan sign of the derivative block forming prohibition signal; analog switch, analog switch switch delay lines, code B switch, input signal generator outputs are connected to analog switch pulse inputs, digital comparator code inequality output is connected and sound pulse generator output, digital comparator code equalizer output to the first input of code B reverse counter, the input of the error counter delay line and the output bus. connecting external 3 recorders to the device, the output of the digital comparator codes A and B is connected to the first input of the prohibition signaling unit, the first input of the reversible error counter and the output bus are connected1 to the external recording device, the output of the code B switch is connected to the second input of the reverse counter code B, the code output of which is connected to the code input of the control digital-to-analog converter, the third input of the diffraction comparator and the input of the unit the second and reverse counters, and the sign of the output of the reversible counter -G code B is connected to the sign input of the control of the digital-to-analogue converter, the fourth input of the digital comparator and the first input of the sign forming unit, Control, the output of the reverse code counter B is connected to the input of the decoder whose outputs are connected. The code inputs of the analog switch, the control output of the automatic and manual setting and start modes are connected to the third input of the reversible counter of code B, the block output of the automatic and manual modes and the start blocks are connected to the digital input of the digital comparator, the output of the digital-to-analog converter connected to the input line of the analog KOMMyra ogia delay line and to the first input of the analog comparator whose output is connected to the second input of the analog-digital converter being tested and to the input of the delay line comparator, the first | MJ output of which is connected to the sixth input of the digital comparator, and the second output to the second input of control unit, the output unit. Formation of direct and reverse counting is simultaneously connected to the second INPUT of the sign forming unit of the derivative and the fourth input of the B code reversing counter. The OUTPUT of the pulse generator is connected to the second input of the reversible counter of the error, to the Third input: the derivative symbol is connected to the second input of the prohibition signal generating unit, the output of which is connected to the second input of the analog comparator, which has a delay line An analog switch is connected to an analog switch, while the output is connected simultaneously to the analog input of a digital comparator and to a digital voltmeter input. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 337932, cl. H 03 K 13/02, 1969. 2. Automated Test Methods to Check Fast Ana 1ogue-td-DtgttaI Converters,. 57-59, 61 (prototype). 8 × “hcg1“ st: in -W .- j V - s "S5Eusi.3S5K" S3ft i y i-i.; ti-i.; i 782144