SU1397943A1 - Resistance multiplier - Google Patents

Abstract

The invention relates to analog computing and radio engineering and can be used in analog-to-digital signal processing, as well as in circuit design of large integrated circuits. The aim of the invention is to increase the thermal stability of the resistance multiplier. The resistance multiplier contains the first I and second 2 voltage-to-current converters, voltage follower 3, the reference resistor 4, the input terminal 5, the bus 6 of zero potential. Achieving this goal is ensured by introducing into the multiplier two voltage-to-current converters, as well as their connection with other elements of the multiplier. .1 il. 2 F (L

Description

VLV8

WITH

with

with

00

one

The invention relates to analog computing and radio engineering and can be used in the field of analog-digital signal processing, as well as in the field of circuit design of large integrated circuits.

The purpose of the invention is to increase the thermal stability of the multiplier.

The drawing is a circuit of the multiplier of resistance.

The multiplier contains the first 1 and second 2 voltage-to-current converters, a voltage follower 3, and a reference resistor 4, connected according to the above scheme,

The multiplier works as follows.

When turned on, the input terminal 5 of the multiplier voltage source U

the amount of current i taken from this source is equal to

i (-UbbJ; R - rr i; 7iT7

one

ь, and (+ g

/ S,

- for example, - t, o mj

the output of the voltage follower 3;

R

Sm .g

 one

resistance of the reference resistor 4;

the current transfer slope, respectively, of the first 1 and second 2 voltage-to-current converters. The effective value of the resistance between the non-inverting input of the first voltage-to-current converter 1 and the bus L of zero potential increases () times and becomes equal to

 as the transmission slope g „i, b m is proportional to the mode current, then the effective value of the resistance

The reference resistor A can be adjusted by setting different operating currents of the first 1 and second 2 voltage-to-current converters. Wherein

I., 1

R, (H (Jiir) -R,

(one)

g

g - mode current, respectively, of the first 1 and second 2 converters

five

0

five

0

five

0

five

voltage to current

 when using converters on bipolar transistors, as well as on field-effect transistors operating in the mode of weak inversion; P

one

 t when using converters on field-effect transistors operating in the strong channel inversion mode. As can be seen from expression (1), the effective value of resistance is also independent of temperature and is determined by

lip i ratio i

1 i

Claims (1)

Invention Formula A resistance multiplier containing a reference resistor and a voltage follower, the output of which is the output of the multiplier and connected via a reference resistor to the input of the multiplier, characterized in that, in order to increase thermal stability, the first and second voltage converters are introduced into it, the first converter the voltage in the Tok is connected to the inverting and non-inverting inputs, respectively, with the output of the voltage follower and to the input of the multiplier, the second voltage to current converter with an inverting input is connected to th output and to the output of the first voltage converter to the current and to an input voltage follower and neinvertiruyupdan input is connected to zero potential bus.