SU528555A1 - DC stabilizer - Google Patents

Description

Sooi through two consecutively connected diodes 9 and 10 and transitions emitter-b aa and additional transistors I and 12. In turn, the collectors of transistors 11 and 12 are connected via a load element 13 to a positive bus. The base of the transistor 11 is connected to the bias source through a resistor 14.

The stabilizer works as follows.

On the circuit: resistor 14-diodes 9 and 10-transistor 1-resistor 3 flows a constant current / k1, which weakly depends on the temperature of the environment, since on the day of the base of transistor 1 a thermocompensating circuit is turned on, consisting of resistors 5 and 6 diode 7. The current flow through the circuit: diodes 9 and 10-transistor 1-resistor 3, causes a voltage drop across these elements, which for transistor I is the bias voltage f / cm. Diodes 9 and 10 are turned on to monitor the bias voltage at the base of the transistor And when the ambient temperature changes, so these diodes must have current-voltage characteristics identical to the emitter-base transition characteristics of transistors 11 and 12.

The base current of transistor 2 flowing through the circuit: diode in-transition EM-YTT-base transistor 2-resistor 4 is part of the stabilized current, so that the collector current of transistor 2 ' e changes with a change in load resistance or voltage (Power.

With a change in voltage or load resistance, the current of stabilization / station of the circuit remains constant.

The current / current is determined by the formula

/ CT / 6i5i5 ,, (1)

where / 61 is the base current of transistor 12;

Si is the current transfer coefficient of the transistor 12;

In - current transfer coefficient of the transistor 11.

The base current of the transistor 12 is determined by the formula

/ ,. . (2)

th,., (B, 5, -) - 1)

where UCM is the bias voltage at the base

transistor 12;

1 / 3-6 - emitter base transfer voltage of transistors;

 output-output resistance of the transistor 2.

Substituted the expression (2) in the formula (1) ,, get

(t / cM-2: / 3 6) BiS,

/with.

.Thg (BlBjt

one)

R,

Since the output impedance of transistor 2 is

.-, CM-2t /, 6 AvaH.Ta -

then finally the stabilization current / st is equal to

(cM-2: /, 6) Bi5.4 ,, .B,

 (t / cM-) (BiBt + 1) B, Ba + 1

With a sufficiently large value of BI and .02

/ f

st ktjt

i.e., the stabilization current does not depend on the main destabilizing factors — transfer coefficient B and voltage across the emitter-base junction when changing the voltage (or load resistance).

The use of the proposed stabilizer in the differential and operational amplifiers allows an increase in the common-mode noise ratio.

In addition, the present invention may find application in formers of sawtooth pulses with high linearity.

Claims (3)

1. Journal "Electronics No. 3, 1971, p. 48, FIG. eight. 2. Journal "Electronics No. 3, 1971, FIG. 9. 3. Auth. St. No. 314272, cl. H 3/14, 1971 (prototype). P