SU494708A1 - Automatic selection of varicaps in sets - Google Patents

Description

one

The invention relates to automatic devices intended for the selection of varicaps by matching the volt-voltage characteristics, and can be used in semiconductor manufacturing.

A device for measuring and selecting tunnel diodes, allowing devices to be disassembled in batches, containing a device for setting the mode and an indicator device.

The disadvantage of these devices is their performance, since the volatility characteristics are judged by the behavior of the oscilloscope on the screen.

The purpose of the invention is to increase the productivity of the control.

The goal is achieved due to the fact that a pulse generator, three groups of logic circuits "AND, logic circuits" OR, triggers and additional actuators are entered into the machine.

The drawing shows a functional diagram of the proposed machine.

The automatic selection machine for varicaps in kolnklekty contains devices for supplying varicaps to measuring position 1, blocks for setting modes 2, measuring meter 3, trigger 4, first actuator 5, pulse generator 6, two groups of logic circuits "And 7, 8,

the triggers 9, the third group of logotypes “And 10, the logic circuits“ IDI 11, the second executive devices 12 and the reference varicap 13.

The machine works as follows.

The feeding devices 1 reference varicap 13 and varicap 14 to be monitored are fed to the measuring position. Mode 2 setting blocks specify the necessary

Compatible mode. The output values of the task blocks are fed to the inputs of the meter, which compares the voltfarad characteristics of the reference 13 and the controllable 14 varicaps. When conjugated

the characteristics of the meter 3 outputs signals to the trigger 4, which controls the actuator 5, and the varican 14 is sent to the container; if the reference varicap 13 differs in volt-characteristic from the monitored 14, the latter is directed along a separate channel.

The generator 6 divides the control period into several parts (in this case, into

two half periods). The output signals of the meter 3 are supplied to two groups of logic circuits AND 7 and 8. In the first half-time control, the coincidence of the signals is provided on one of the circuits AND 7, depending on which varicap capacity is higher. Similar to par3

The second group of schemes “And 8 in the second half-period of control” is The output signal of each of the circuits "And 7 and

8 acts on the trigger 9 connected to its output, putting it into another stable state. If the capacity of the controlled varicap exceeds the capacity of the etalopic one, in the first half-period of control the first trigger 9 is activated, in the second half-period - the second trigger 9; if the capacity of the reference varicap exceeds the capacity of the controlled one, the third trigger 9 is activated in the first half of the control, and the fourth trigger 9 in the second semi-cornea.

Direct and inverted trigger outputs

9connected group of logic circuits "And 10 and" OR 11 so that in the case of higher capacity controlled varicap compared with the capacity of the reference in the first half or in the first and second noluperiod a signal appears on one of the outputs to which one of the actuators 12 is connected. The actuator directs this varicap, which is not equipped with varicap 13, into a separate container; if the capacity of the reference varicap exceeds the capacity of the monitored, in the first or in the first and in the second half-periods of control the output signal occurs at another output, to which the actuator 12 is also connected, which directs the varicap to another container.

If the capacity of the varicap controlled exceeds the reference capacitance in the nerve half period, and the second is higher than the reference capacitance, a signal appears on the third output, and the actuator 12 connected to it sends such an incomplete varicap to the third container. If the capacity of the reference varicap exceeds the capacity of the controlled in the nerve half-period, and in the second half-period the capacity of the controlled varicap exceeds the capacity of the reference, a signal is generated at the fourth output, which controls the fourth actuator 12, which directs such a device to the fourth container.

After unloading the monitored device

in one of the tar feeder diodes 1

another controlled varicap is served

14, the process is repeated.

After the end of control of the entire batch, the rejected groups of devices are passed through the machine. If necessary, multiple divisions can be made on the group.

Due to the fact that the devices in the groups, when divided, have more similar volt-voltage characteristics, there is no need to compare devices of different groups, since their volt-aral characteristics differ sharply, the number of comparison operations decreases.

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Subject invention

An automatic selection machine for varicaps, containing a device for supplying varicaps to a measuring position, blocks for setting modes, a meter with a trigger connected to the outputs, an actuator control device, characterized in that, in order to increase performance, a pulse generator

groups of logic circuits “And, logic circuits“ OR, triggers and additional operating devices, the first inputs of logic circuits “And the first and second groups are connected to the outputs of a pulse generator, and the second inputs to the outputs of the meter, and the output of each circuit“ And connected to the first input of the trigger, the second input of which is connected to the reset circuit, and the outputs are connected to the inputs of logic circuits

“And a third group, two pairs of which are connected to additional actuators, each one through the“ P ”circuit, and one pair directly.

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