SU922791A1 - Logarithmic converter - Google Patents

Description

(54) LOGICAL TURNOVER COVER

I

FIELD: electrical signal conversion devices. | by logarithmic law and can be used in computers.

A logarithmic converter is known, which contains a source of reference na1f51zhe and, an integrator, a functional frequency converter, a center circuit & .not, trigger 1 .x

 A disadvantage of this device is its low speed.

The closest to the proposed is a logarithmic converter containing a switch, a code-to-voltage converter, two anapog storage devices, a comparison circuit, a register, a pulse generator, a pulse distributor, a control unit, and a voltage source G21.

However, the well-known logarithmic converter has a complex functional circuit and low accuracy of work.

The purpose of the invention is to improve the accuracy and simplification.

The goal is achieved by the fact that in a logarithmic converter containing a first key connected in series, an analog storage device, a comparison circuit and a register whose outputs are the outputs of a 10 barometric transformer whose input is the input of the first key, the second key whose output is connected to output of the first key, pulse generator, inverter, reference voltage source 15 and pulse distributor, KOi-oporo output connected to the inputs of the register, the first output of the distributor pulse They are connected to the control input of the first key and the input of the inverter,

The output of which is connected to the control input of the second switch, the output of the pulse generator is connected to the control input of the analog storage device and to the input of the pulse distributor, the output of the reference voltage source is connected to the second input of the comparison circuit, an additional switch and a quadrant connected in series are inserted and the quadrator , the output of the quadrant is connected to the input of the second key, the input of the additional key is connected to the input of the scaling unit and to the output of the analog storage device The output of the comparison circuit is connected to the control input of the additional key, the output of which is connected to the output of the scaling

block.

The drawing shows a functional diagram of the proposed logarithmic converter.

 The circuit contains the first key 1, an analog storage device 2, an additional key 3, a scaling unit 4, a comparison circuit 5, a reference voltage source 6, a register 7, a quad 8, a second key 9, a pulse generator 10, a pulse distributor 11, an inverter 12, input 13 and outputs 14-1, 14-p logarithmic analog-diffraction converter .. °

The logarithmic converter works in the following way.

With the arrival of the first clock pulse from the pulse generator 1O, the first switch, key 1, closes the pulse distributor 11, closes the BTOI switch 9, and converts the voltage from input 13 to the analog storage device 2. The clock pulse also writes to the analog storage device 2 the output of which the memorized voltage enters the comparison circuit 5. If the memorized voltage is greater than the reference voltage, then 1 is written to the high bit of register 7, and the additional key 3 is opened. If the memorized voltage, less than the reference, then the most significant bit of register 7 is written O, and the additional key 3 is closed. As a result, a voltage is established at the end of the first clock cycle at the output of the quadrant 8. .

- (G -)

base of logarithm;

transfer coefficient of the scaling unit 4; the voltage of the analog storage device 2 stored by the first clock pulse.

Reach V (1), 0, at 0, Ug, 0)

where 0 (j is the reference voltage.

The bits of register 7, in which information is recorded, are selected sequentially, starting with the highest, with the help of the distributor 11 pulses.

With the arrival of the second clock pulse at the input of the pulse distributor .11, the first switch 1 opens the second switch 9 and closes, and the voltage from the output of the quadrant Si, which is fed to the comparison circuit 5, is stored in the analog storage device 2.

If this memorized voltage is greater than the reference voltage, then the next discharge

register 7 is written 1, and additional key 3 is opened, if the memorized voltage is less than the reference, then register 7 is written O, and additional key 3 is closed.

As a result, the voltage will be set at the end of the second cycle at the output of the quadrant 8

V- (

And.

1, WITH U.7Ug.

,)

Further, the work is similar until the information is recorded for the last time in register 7.

As a result, the voltage at the end of the last clock at the output of the quadrant 8 is set.

(one

and

2L

, (B)

W

tl 1 1.

a ./- M t) -b

n-i

...- b

where Ux is the input voltage 13, Since the exponents in the expression (6) correspond to register 7, and

, PFP e ,,

, CR “and„ 0 (,, (9)

then, to the logarithm of both parts of the expression (Q) i, we obtain that the result code in register 7 is equal to the logarithm from the input voltage yo to the selected base

)

fvfV-

Claims (2)

-i In comparison with the known device, in the proposed logarithmic converter, the accuracy of operation is improved, which is determined by the accuracy of only the quad with a more functional diagonal circuit. A logarithmic converter comprising a serially connected first key, an analog storage device, a comparison circuit and a register whose outputs are the outputs of a logarithmic converter whose input is the input of the first key, the second key whose output is connected to the output of the first key, a pulse generator, the inverter, the source of the reference voltage and the pulse distributor, the outputs of which are connected to the inputs of the register, the first output of the pulse distributor is connected to the control The first input of the key and the inverter yusod, the output of which is connected to the control input of the second key, the output of the pulse generator are connected to the control input of the analogous memory device and to the input of the distributor ttta pulses, the output of the reference voltage source is connected to the second input of the circuit , characterized in that, in order to improve the accuracy of operation and simplification, an additional key and a scaling unit connected in series are introduced into it and. the quad, the quad output is connected to the input of the second key, the additional key input is connected to the input of the scaling unit and to the output of the analog storage device, the YETS comparison circuit is connected to the control input of the additional key, the output of which is connected to the output of the scaling unit. Sources of information taken in. Attention during examination 1.Authorial certificate of the USSR O 424171, cl. Q 065 7 / 24,1974. 2. USSR author's certificate 54O266, cl. G 06G 7/24, 1976 (prototype).