SU529463A1 - Cosine function transducer - Google Patents

Description

one

The invention relates to computing and can be used in computers.

One of the known cosine transducers contains a series-connected diode function transducer and a multiplier element Cl. This transducer has a relatively low conversion accuracy and low reliability in operation.

Functional converters are also known that contain scaling resistors and controlled transistors 2. They are more reliable in operation, but do not provide sufficient conversion accuracy.

Closest to the invention is a well-known cosine functional converter containing two elements with controlled resistance, each of which is made on a field-effect transistor, the gate of each of which is connected to a zero potential terminal through a corresponding filtering capacitor and protective diode, the outlets of field-effect transistors the converter and through the third filtering capacitor are connected to the zero potential bus, the source of the reference voltage, one output of which is connected to non-zero potential, another output through parallel-connected spreading resistor and the fourth filter capacitor connected to the output of the converter, the sources of field-effect transistors are connected to the zero potential terminal, the gate of the first field-effect transistor is connected to the one output of the control signal, the other output of which is connected to the gate of the second field effect transistor, the second limiting resistor is connected to the output of the bias source.

However, this device is not sufficiently reliable in operation due to the lack of electrical adjustment of the scale of the argument.

The aim of the invention is to increase the reliability of operation.

To do this, balancing resistors are introduced into the proposed cosine functional converter, the first and second of

which one pins are connected to another pins of the second limiting resistor, the third and fourth balancing resistors are connected by one pins to the second output of the bias source, other pins of the nerve and the third balancing resistors are connected to the gate of the first

field-effect transistor, and the other conclusions of the second and fourth balancing resistors are connected to the gate of the second field-effect transistor.

The drawing is a diagram of the described Converter.

The converter contains the first and second elements with controlled resistance at field-effect transistors 1 and 2, a mass stabilizing resistor 3, a source 4 of the reference voltage, the first 5, the second b, the third 7 and the fourth 8 filter capacitors, the output terminal 9, the protective diodes 10 and 11 , the first 12 and second 13 limiting resistors, the first 14, the second 15, the third 16 and the fourth 17 balancing resistors, terminals 18 and 19 for connecting the control signal source, terminals 2O and 21 for connecting the bias source, zero potential terminal 22.

When bias voltage is applied, both field-effect transistors 1 and 2 are slightly open. The input control signal from terminals 18 and 19, the passage through the balancing resistors 14-17, which form the bridge circuit, opens one and closes the second field-effect transistors 1 and 2 so that the resistance between their sources and sinks varies according to a close-to-square law. At the same time, the scaling resistor 3 and the pair of field-effect transistors 1 and 2 operate as a functional voltage divider from the outputs of which, at a certain choice of the operating mode of the transistors, the voltage is removed, depending on the input control signal according to the law close to the solid state.

The reliability of the converter in operation is increased after the introduction of the balancing resistors 14-17, connected in a bridge circuit, which allows reducing the number of nonlinear elements in comparison with the known diode functional converters. In addition, the proposed Converter provides differential operation of a pair of field-effect transistors 1 and 2 in

the mode of electrically controlled resistance, so that the failure of one of the transistors leads only to a certain decrease in the accuracy of the functional conversion.

Claims (2)

1. Computing Technology Handbook under. ed. Husky G. and Korn G., Vol. 1 Energie, 1964, pp. 194-195. rice 3-2-24a. 2. Digital electrical measuring instruments Collection under. ed. V.M. Shl Ndina, Energy, 1972, p. 22O-221, fig. 520. 18 019