SCIENTIFIC ABSTRACT MITYASHEV, B. N. - MITYAYEVA, N. A.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R001134810004-9
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: November 2, 2016
• Sequence Number: 4
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

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Concerning an Optimum M121
Temporary Location
A1-2 IYTT-~Lf :.u 1.;
where p o UrTic 0 0 ra , I
It ~;hould
inatched f I Iter outp-~*
power. At ~,Igher '(2.r,!'
where E is signal. 1, 1.
valued solutions wtll resul.- d--ie to tht -tppe,,ir~.n
flares. This Is a reason f'~~r keeplin,-, luw
noise limit. The limit of noise-to-z3iff,~.Ii,
.1M
function of trie 3ele,ted section 2T jj J-1
of signal p--ilses col 'v.te~. The noise I'lar(-,--
T > T 'he ratio
,,,T For T
c
is maxim~-im, .-ihich be -,jr,~;Idered jn-j
While detec!:in6 a p ise, howe,--2r e
,.ery clo,,)e to o,-2. i r T >T, for
-n-
PW o"I 1/ (31)
C a r.J ./14
C "1'19 an Optimum Method
n ry )e
Loc a t to n
:;()V
SUBMITTED:
Which is vali(i as long
D,2termillirlg
"he pIA13e
ma x i it, um (Fig- 3), the 1-he
by (24), nd the ~ I'
limit
if the filter before-,
matched OPt'mum filter. Wht-,n
-l" fnr
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f
G /T,,, only the
realized.
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before the def er,Loj, j the
be otjjy
~1 1'(2W h1fr
T.,
greatest
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Signals With T
described here gi * 'e
are table; ~2 r"2
3 figures; he
March 4, lq~q :i r .d :14/14

26429
s/lo6/6o/ooo/,_)cr,-/a 3/o~
3 o (/0/ -31 9-0) AC55/A 133
AUTHOR~ Mityashev, B. N.
Tf-=- Low-frequency noise spectrum at the output of limiters
,k, 1 1 '4
PERIODTCAL: Elektrosvyaz',Ano. 5, 1Q60, 17-21
IEX',: The thor anaiyzes the low-frequency noises at the output of uni-
lateral or bilateral limiters I.e. noises that have passed through the h-f
amplifier and through the limiter; he calculates the dependence of the correla-
tion coefficient and of the effective spectrum width of the h-f component of the
output noises upon the limiting level. He begins by examining the case of a
,nillateral limiter and assumes that a stationary noise is applied to the input
of this limiter whose probability distribution density is
2
x
W (X) e
r7F,
where x = u/V is the relative noise voltage. TI-e instantaneous voltage at the
limiter outpu? is:
Card 1/8

26429
S1 106/60/000/--,C 513C, 3//
!-,ow-frequency noise spectrum ... A055/A133
U, (x > x 0)
ulim f (u) f ((50X) f0, (x < x 0)
wnere xo = uo/6. is the relative limiting level. The fluctuation dispersion at
the limiter output is;
62 62 F x2 + 2x W (x + IIFO-5 AO(X
lim 0 0 0 0 0
- X2 fO-5 -~(x )12 x W (x W2 (x (3)
0 0 0 0
where
x
2
X
(x I e 2 dx.
0 f2 17 ~o
0
If the noise at the limiter Input has already passed through a filter with
resonant frequency co, and has a correlation coefficient In the form of
9
(T ) Cos CO. -L , the output voltage correlation function Is:
,"ard 2/8
C

26429
S/106/60/000/005/OG3/OG9
Low-frequency noise spectrum ... A055/A133 7~
or 2
x
61 0
Cn Hn-2 (x 0) e (7)
The 1-f components of the output noise are determined by the terms of the se.,ies
(4) containing even powers of cos Wo T. Using the first term of the development:
k I
Cos 2kX (2 k)t + (2 k)j cos 2 (k_- m) x
k1 ki 22K 22k-1 m! (2k m)!
,ne author obtains the following expression for the correlation function of the
I-f component of the output noise: .
-x 2E H2 (x
to an I e 0 2k - 2 0 2k M. (8)
2% ki k!12 2k
k-I
Tne ~:orrelatlon coefficient of this component is:
Card 4/8

P6429
s/ 1 o6/6o/D00/C,( 5/DC 3//X9
Low-frequency noise spectrum ... A055/A133
V 0 f2k
r rZ 1 0% a (9)
YO ( ) __1 2k
k=1
where 2 (x.)
H_
2k-2
a2k 00 2
2k 2m-2 0
k! k! 2 --nr
m! m! 22
Formulae (8) and (6) show how 'yo varies with the limiting level x
Practical calculations and the resulting graphs showed that for x.