SU1363440A1 - Current generator - Google Patents

Abstract

The invention relates to microelectronics. The purpose of the invention is to stabilize the output current in a wide range of changes in the gain factor. The current generator contains a two-collector transistor 1, transistors 2 and 5, a current mirror on transistors 3 and 4, resistors 6 and 7 and diode-8. When the input current is set, transistor 1 opens, a small current flows through diode 8, and most of the input current of transistor 1 flows from the emitter of transistor 5. When the potential decreases at the base of transistor 5, then transistor 5 begins to stabilize its emitter current and, therefore, the output current of transistor 1 is also stabilized. If the current mirror transfer coefficient is equal to one and the currents of both collectors of transistor 1 are equal to each other, then the output current is proportional to the collector current of transistor 3, ohm on the output current does not affect the gain of the transistor 1; which is the most unstable parameter, 1 or „i (L Input Ife Ife5 life IZ8)" CO 05 CO 4 4ib Ixf6 t x -Ur,

Description

to determine its emitter current, and, therefore, the BLF-input current of the first transistor 1 is also stabilized. At the same time, a current 1d (Un-Ug) flows through the second resistor: - е, - f, s5bR, (and ,,, -Ug -U ,): R,,

Since the base current of the p of the transistor 5 is much less than I ,,; (on 10

rank Ij, 5; J when take that i

/ P -L

one),

R7 TO BE POSSIBLE

KZ

where i

KS

and

11363440

The invention relates to microelectronics and is intended for use in logic and integrated circuits implemented by high-voltage bipolar technology.

The purpose of the invention is to stabilize the output current in a wide range of variations in the gain.

The drawing shows the basic electrical circuit of the proposed current generator.

The current generator contains the first transistor 1, made two-collector, from the second to the fifth transistor-15 transmission of the current mirror to the transistor 2-5, the first 6 and second 7 resistors tori 3 and 4 are equal to one, and the current and diode of 8. both collectors first transistor

The current generator operates as follows 1 equal to each other, then it is possible Ig ,, I ,, (U. ,, + Ug -and „): R ,, 20 At the same time, the output current is not affected by the gain of the first transistor 1, which is This is the most unstable parameter due to the fact that the first transistor 1 is a high-voltage lateral, pnp-type transistor, the collector-currents of transistors 5 and 3, respectively,

In the particular case if the coefficient

in a way.

When setting the input current, the first transistor 1 opens, its potential is maintained on its emitter

and

9(

 and"

- I.V. - at ;

where the voltage drop at the base-emitter junction of the second transistor 2i

and. - voltage drop across the diode

de &.

After diode 8 a small current flows

25

prepared in a single technological cycle using high-voltage bipolar technology. It is only necessary that

30 output control current

(I.

in

,)

no less than Term- VJ-K, 1 and-1 K, and - currents flowing respectively through the first and second collectors of the first transistor 1 p - the minimum allowable gain factor of the transistor.

 6,652

Bag

1 | cr

where „,

-K2

 -kg -VH;

the current flowing through the base-emitter junction of the second transistor 2, the collector current of the second transistor 2 (3j, is the gain of the second transistor 2. Most of the emitter current of the first transistor 1 flows from the emitter of the pth transistor 5,

The output current flowing through the first collector of the first transistor 1 is proportional to the current flowing through the second collector of this transistor and. coming in the fourth (zadoskatsy) transistor 4 current mirror. Therefore, through the third transistor 3 current mirror npote-

35

40

no less than Term- VJ-K, 1 and-1 K, and - currents flowing respectively through the first and second collectors of the first transistor 1 p - the minimum allowable gain factor of the transistor.

Claims (1)

Invention Formula The current generator, made on the first transistor having a pp-p-structure, the base of which is the input of the current generator and connected to the collector of the second transistor, having a p-p-p-structure, the base of which through the first resistor is connected to the collector of this transistor and with a positive bus, a power source gQ nor, with E. THOM the collector of the first tran45 kata current I KZ proportional to the output current, On the basis of the first transistor, the potential Ugy U - I is given. When at the base of the fifth transistor 5, the potential drops to U ,, -, the fifth transistor 5 starts the stabilizer is an output of a current generator, characterized in that, in order to stabilize the output current in a wide range of changes 5 to 55 it has a current mirror introduced in the third and fourth transistors with a pn-structure, a fifth transistor having a pn-p structure, a diode and its own emitter current, and therefore the BLF current of the first transistor 1. At the same time through resistor 7 flows 1e current (Un-Ug): - e, - f, s5bR, (and ,,, -Ug -U,): R,, Since the base current of the p of the transistor 5 is much less than I ,,; (on led rank Ij, 5; J when take that i / P -L one), R7 TO BE POSSIBLE KZ where i KS and  collector-currents of transistors 5 and 3, respectively, In the particular case if the coefficient prepared in a single technological cycle using high-voltage bipolar technology. It is only necessary that output control current (I. in ,) no less than Term- VJ-K, 1 and-1 K, and - currents flowing respectively through the first and second collectors of the first transistor 1 p - the minimum allowable gain factor of the transistor. Invention Formula The current generator, made on the first transistor having a pp-p-structure, the base of which is the input of the current generator and connected to the collector of the second transistor, having a p-p-p-structure, the base of which through the first resistor is connected to the collector of this transistor and with a positive bus, the power source, with E. THOM the collector of the first trans 313634404 The first resistor, the emitter of the first transistor resistor is two-collector, is connected to the emitter of the first transistor collector of which the resistor and to the cathode of the diode, which is connected to the input of the current mirror, which is connected to the base of the second transistor. the output of which is connected to the base of the p transistor, and the combined emitter of the transistor and, through the second resis of the third and fourth transistors, the torus to the collector of the fifth transistor current mirror are connected to a common and positive source.