SU1347031A2 - Voltage ratio meter - Google Patents

Abstract

The invention relates to radio e: technology and can be used in the system of radio engineering measurements. The aim of the invention is to extend the functionality of the meter. In order to achieve this goal, the sum-difference block 2 and phase are additionally introduced into the meter. 4 and 5, four switches 6–9, summer 10, carrier amplifier 11, envelope detector 12, envelope band amplifier 13, phase meter 14, and generator: 15. Using an additional sum-difference unit and 1Т (a phase shifter on -j allows There is no need to determine the phase difference of input signals having the same amplitude, which expands the functional capabilities of the meter. 1 Illy with € (L 14

Description

The invention relates to radio engineering, can be used in radio measurements and is an improvement of the invention according to autom. No. 1242840.

The purpose of the invention is to expand the functionality of the meter ..S

The drawing shows the functional scheme of the meter ratio

performance.

The meter contains two total difference blocks 1 and 2, the phase shifter

3 on L / 2, two splitters 4 and 5, four switches 6-9, adder 10, carrier carrier 11, envelope detector 12, band envelope amplifier 13, phase meter 14 and generator 15.

 The inputs of the sum difference unit are the inputs of the meter. The total output of the sum-difference block 1 is connected to the input of a splitter 4. The differential output of the total difference block of block 1 is connected via a phase shifter 3 to / 2 connected to the input of a splitter 5 Pefvy output of the first splitter

4 connected through the first switch

6 with the first input of the adder 10, the second output with the first input of the sum-difference unit 2. The first output of the second splitter 5 is connected to the second input of the sum-difference unit 2, and the second output through the third switch 8 to the third input of the adder 10.

The total output of the sum-difference unit 2 is connected via the second switch 7 to the second input of the adder 10 and the difference output of the sum-difference unit 2 is connected through the fourth switch 9 to the fourth input of the adder 10. The output of the latter is connected through a series-connected amplifier 11 of the carrier, an envelope detector 12, a bandpass amplifier 13 with the first input of the phase meter 14, the second input of which is connected to the First output of the generator 15.

The control inputs of the switches 6-9 are connected respectively to the second, third, fourth and fifth outputs of the generator 15.

The output of the phase meter 14 is the meter output.

The meter works in the following way.

The inputs of the sum-difference block I receive variable voltages with frequency cj and amplitude U:

and cos

(a) t

LCh -2

and and cos

I {oOt - -)

having a phase shift between each other - & H On the total and differential results - sum-difference block 1 (taking into account the division of power in half) there are signals, respectively

cos

LF COSa U

2

at

,-P

J2

sin

QH

2

S in o) t and at the entrances

splitters 4 and 5, (taking into account the shift by ff / 2 on the phase shifter 3)

and the outputs of the first splitter 4 there is a signal with amplitude and / 2 | at the outputs of the second splitter 5, the signal with amplitude and, / h2, at the total output of the sum-difference block 2, taking into account the division of power, oscillations with amplitude (U + U) / 2, and at its differential output - with amplitude (and - 112) 72 . From the second output of the generator 15 to the control input of the first switch 6, switching pulses of duration 7: are applied with a period T, and T 4t.

From the third, fourth, and fifth outputs of the generator 15, pulses with a duration and period T 4G, but with a time shift relative to the pulses of the second output, respectively, also go to the control vcodes, respectively, of the second, third, and fourth switches 7–9 and ST.

Consequently, the first input of the adder 10 comes without delay

impulse with amplitude and duration T, and the second input - impulse with amplitude (U + U) / 2, duration G and delayed by, the value T, at the third input - impulse with amplitude U, / J2 and with delay the value of L and the fourth pulse input with amplitude (U -U) / 2 and delayed by time ZTg.

Pa 10 a carrier signal is generated, the amplitude of which U (t) varies with the frequency of the switching pulses coming from the generator 15 according to a stepwise law so that

U (t).

and / hG2 (and, - Uj / 2

Uo / NTz

JU - U,) / 2 T 4r.

The envelope of this stepwise varying amplitude U (t) is a sinusoid.

This signal is amplified by carrier amplifier 11 and detected by a quadratic detector 12, the output of which forms a step voltage proportional to V (t). In the band-pass amplifier 13, the first harmonic of this voltage is extracted, which is fed to the first input of the phase meter 14. Its phase shift is determined by the value If 2 arctg U / U or taking into account the values of and and, H.

This incursion is converted into an output voltage by a phase meter 14, to the second input of which the reference sine wave signal with a frequency of 2T (/ 1 comes from the first output of the generator 15.

Compiled by M.Katanov Editor I.Gorna Tehred I.Popovich Proofreader V. But ha

Order 5117/44 Circulation 729 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

The 1I's power amplifier is passive and, therefore, practically does not contribute anything significant. The main active element of the amplifier 11 does not introduce sug (natural errors, since the information is contained in the phase of the envelope of the carrier oscillations, and not in the parameters of the carrier oscillations themselves.

The use of an additional sum-difference unit and a 7G / 2 phase shifter makes it possible to determine the phase difference of input signals having the same amplitudes, which expands the functionality of the meter.

20

Claims (1)

Invention Formula Voltage ratio meter according to auth. No. 1242840, which differs from 25 Sch and with the fact that, in order to expand its functionality, an additional sum-difference unit and a TlT / 2 phase shifter were introduced into it, while the inputs of the sum-difference 30 block are connected to the input terminals for phase difference measurements, the total output — with the input of the first splitter, and the differential output via the phase shifter by J / 2 — with the input of the second splitter.