SU1356198A1 - Current generator - Google Patents

Abstract

This invention relates to microelectronics. The purpose of the invention is to reduce the power dissipation and increase the temperature stability of the output current. The current generator contains transistors 1.2 and 3 and resistors 4 and 5. The voltage at the base of transistor 2 is determined by the voltage drop at the base-collector junction of transistor 3 due to current flowing through the circuit: resistor 5, junction, base-collector of transistor 3 and power supply bus. If transistor 2 is in active mode, then transistor 3 is open and saturated. The goal is achieved by introducing a transistor 3, which allows to choose a smaller current-setting resistor 4. 1 sludge. fr Un. -o (L 00 SP 05 from 00

Description

one . 13

The invention relates to microelectronics and can be used in the construction of integrated circuits.

The purpose of the invention is to reduce the power dissipation and increase the temperature stability of the output current.

The drawing shows a circuit diagram of a current generator.

The current generator contains the first 1 and second 2 transistors, an additional transistor 3, the first 4 and second 5 resistors,

The current generator operates as follows.

The voltage at the base of the second transistor 2 is determined by the voltage drop at the junction of the base-collector of the additional transistor 3 due to the current flowing through the circuit: the second resistor 5, the transition base-the collector of the additional transistor 3, the power supply bus. This voltage consists of two components un-gadih:

and

5e2

+ and

CNZ)

de and

5kz

and

kW3

and

5E2

the voltage drops respectively at the junction of the base - the collector And between the emitter and the collector of the additional transistor 3j the voltage drop

the transition base - the emitter of the second transistor 2,

If the second transistor 2 is in active mode, then the additional transistor 3 is open and saturated. ,

Stronger on saturated transistor (inversely turned on)

V,

and

Kng

/ 3

N

Compiled by And, Water Khina Editor N. Kishtulinets Tehred M. Dndyk Proofreader S. Shekmar

Order 5810/53 Circulation 900 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab.,. 4/5

Production and printing company, Uzhgorod, st. Project, 4

where ft is the gain of the transistor.

The voltage on the basis of the second transistor 2, relative to the power supply bus, is distributed between the base-emitter junction of the first transistor 1 and the voltage drop on the current-supplying first resistor 4.

The output current is determined by

 Oh and Kne I

four

where R4 is the first resistor 4.

Thus, the value of the current-supplying first resistor 4 can be chosen less than what is known, and this provides both a decrease in the power dissipation and an increase in the temperature stability of the output current.

Claims (1)

Invention Formula The current generator containing the first transistor, having one structure, the collector of which is the output of the current generator, the emitter of the first transistor through the first resistor is connected to the power supply bus, the base is connected to the base of the second transistor having the same structure, and The second output of which is an input of a current generator, distinguished so that, in order to reduce the scattering power and increase the temperature stability of the output current, an additional transistor having the same structures is introduced y, the collector, which is connected to the power supply bus, and the emitter and base are connected respectively to the emitter and the base of the second transistor, the collector of which is connected to the water of the second resistor to the second you