SU1762268A1 - Device for measuring of frequency converter efficiency - Google Patents

Abstract

Inventors are related to tecnical zeros on microwave and can be used to measure the transmission coefficient of the transducer. The goal of Soil 1 and the C / ruar ro je aTopa I a circuit is the frequency frequency of the paired signal and the frequency and frequency of the signal. le / 1itel4 on the hetsred Nh i ioio transobzov и1vl 3 iasto i o novrem-1 wasp. hetero-ia 2 “The ship 4 stops at the start; not about dmgrtooa 7-“ is entered, and the second one from one of the series receives a heveat 6 ope r1 i i vot zhch s, g- (prev (i33GBoi6 i 3 11 s l. Am d 7 1 zyut on and, c-dps gpsg nq c Hd all over the form for ip e 0e. Cg zl -id i regimenta oto the difference between mastoto oro 1o 0 carrying information & module Ficienta pass poozzoztelch 3 1

Description

The invention relates to measurements at ultra-high frequencies and to be used for direct measurement of complex transfer coefficients and frequency transducers (for example, betel and t r carrier mixers) and to study their high and phase characteristics (frequency response and phase response).

A device for measuring the transmission coefficient of frequency converters is known to pump the frequency from the output of the output to the first input of the investigated conversion frequency, consequently connected to the external geger of the homeland, and its split input is the output for connecting the second input of the studied conversion frequency mixer, the first input of which is the input for connecting the output of the investigated sample of frequencies and to the output of the switch - the display interface and the port d

schemas with i-ix OHn3aL chi 1agtot icpULiHexo j -oooro vpodski cherk cusher for the situation a circuit with a sweep frequency input

One% of this VCTDOHCTCO h is quite complex t to the day of ensuring synchronic tuning of the first signal of the generator I shake DREAM of a frequent and heterodyne heteroscale neoschocygia CTOVHL g using a synthesizer - u3CioTf The purpose of the invention is to simplify

Day aocTh ken iq roc azle1-th purpose of the device d and i megeni koEfts4 tom transmission of astpt1 containing the generators aachayushe with nn investigator of the local oscillator and the first 1. and exit

with.

X-

which is the output for connecting the second input of the frequency converter under study, and the indicator, are connected in series the second divider, the adder and the homodyne detector, the output of which is connected to the indicator input, and the second input is the input for connecting the output of the frequency converter under study, while the generator output oscillating frequencies are connected to the input of the second divider, the second output of which is an output for connecting the first input of the frequency converter under study, and the second output of the first divider is coupled to a second input of the adder.

The drawing shows a block diagram of a device for measuring the transmission coefficient of a frequency converter.

A device for measuring the transmission coefficient of a frequency converter contains a oscillating frequency generator 1, an external local oscillator 2, a frequency converter 3 under study, the first: 4 and second 5 dividers, an adder b, a homodyne detector 1, an indicator 8.

Moreover, the output of the oscillating frequency generator 1 is connected to the input of the second divider. 5, the outputs of which are connected to the first input of the frequency converter under study 3 and the first input of the adder 6. The output of the external local oscillator 2 is connected to the input of the first divider 4, the outputs of which are connected to the second input of the frequency converter under study 3 and the second input of the adder 5, the outputs of the homodyne detector 7 are connected to the output and the adder 5 and the frequency converter under study 3, and the output is connected to the input of the indicator 8.

The device works as follows.

The measurement is based on double coherent frequency conversion. Sweep Frequency Generator Output

1fc frequencies and external LO signal

2 frequencies f, - are fed to the corresponding inputs of frequency converter 3 under study. Since it performs frequency conversion fc, the output signal will have a frequency of 1 out fc + fr (i.e., in general, the transfer can be carried out fc down as well. and up). In addition, the signal of the external local oscillator 2 is inputted into the reference channel with the help of the first divider 4, where it is summed with the corresponding frequency f0h using the adder 6, and the total signal goes further to the start of the homodyne detector 7. To another input

0

five

0

0

The fDbix frequency signal comes from the output of frequency converter 3 under study.

So, the homodyne detector 7 is affected by a polyharmonic signal, which can be represented as follows:

U - Us Snp I cos (Shvih t + ppr) +

+ Ur COS ((Or -r pr) 4fUon COS (CWon t + Јbn), (1)

where Uc, Ur, Uon are the amplitudes of the signals of the oscillating frequency 1 generator, the external oscillator 2 and the reference signal;

ISnpl, / - Yip is the modulus and phase of the measured transmission coefficient of converter 3;

pi, urine phases of external heterodyne signals and reference signal.

If we approximate the characteristics of the diodes of a homodyne detector T by a polynomial of the third degree

  a0 + a-, U + 32 U2 H - az U3 (2)

and substitute (1) into (2), then among the components i (and, accordingly, the output signals of the homodyne detector 7} will be

ip - 6 az Uc Ur U0n I Snp i X

X COS (UJnp t -f) COS (Ctk t 4 -: - pr) COS ("on t + pon). (3)

If we apply to (3) the well-known trigonometric transformations and take into account that

i c fc - ton - fp ..

where fp is the intermediate frequency at which A is the primary processing of information signals; . we get

uinf 1.5 az Uc Ur Uon Snp I X

X cos Wp t -f (pnp - Јon ± pr) (4)

Narrowly, s the output signal spectrum of the homodyne detector 7 is the intermediate frequency signal fp, the amplitude of which, according to (4), carries information about the measured iSnpi value, Ј the initial phase — about the apt value.

A home-mode detector 7 makes it possible to isolate the real and imaginary co-connectors of this signal, i.e., we have the opportunity to measure ISnpl and rpp when using a network analyzer. Normalization of Winf Yu to Ur during the calibration process excludes in (4) a dependence on U g.

The technical and economic advantages of the proposed device in comparison with the known one are that there is no need for primary mixing Top by an amount of + Tr and subsequent synchronization of the frequency tuning fc and ((on -t fr) by applying cr-ntezetorov frequency. In addition, it was important to measure the transmission coefficients of frequency converters with the help of homodyne network analyzers, which are simpler and cheaper than heterodyne ones.

Claims (1)

Claims of Invention A device for measuring the transmission coefficient of a frequency converter associated with an oscillating oscillator. the output of which is pyhod. connecting the first 8x0.03 of the frequency converter under study, serially connected external local oscillator and divider, the first output of which is EYHO HOUSE for connecting the second input of the frequency converter under study, the mixer the first input of which is the input of the day connected - the output of the old frequency converter, An indicator is connected to the output, as well as a reference frequency generator, which differs from that in order to simplify, an adder is given, the first input of which is connected to the output of the reference frequency generator s, the second input is with the second input of the divider, and the output is with the second input of the mixer. WITH 7