HSP50210 Просмотр технического описания (PDF) - Renesas Electronics

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Компоненты Описание

производитель

HSP50210

Digital Costas Loop

Renesas Electronics 

REGISTER ENABLE RATE

@ = SYNC RATE

* = TWICE SYMBOL RATE

! = SYMBOL RATE

BLANK = CLK RATE

HI / LO

MATCHED FILTERING

REG

REG

NCO MIXER

BYPASS

MIXER

R

E

G

R

E

GM

U

RR X

COMPLEX E E

MULTIPLY G G

RR

EE

GG

BYPASS

RRC

M

15 TAP RRC

@

RR

EE

GG

U

X

15 TAP RRC R R

EE

@

GG

REG REG

REG REG

ROOT RAISED COSINE

(RRC)

SIN / COS

ROM

REG

+

REG

CF

REGISTER

FROM CARRIER TRACKING

LOOP FILTER

TO SYMBOL TRACKING

MID AND END

SYMBOL SAMPLES

I I QQ

MID END MID END

L

I

M

I

T

R

E

G

R

E

G

R

E

G

R

E

G

FALSE LOCK

REG

DATA DE-SKEW

DUMP OQPSK

COMPARE

“0”

M

U

X

+

DUMP

R

E

G

@

M

R

E

U

X

G

S

H

I

F

T

R

E+

G

* * TWO SAMPLE

M

“0”

SUMMER

M

U

X

U

XR

S

H

+

E

I

G

F

T

@

R

E

+

G

*

INTEGRATE AND DUMP

D

R

E

M

U

X

E

SOFT G

DECISION

SLICER

D

R

E

M

U

E

G

X

TEST R R

EE

M GG

U RR

X EE

GG

CARTESIAN TO

POLAR

5

8

I2+Q2 DELAY

M

REG

U

X

TAN-1(QI )

5

DELAY

REG

8

* PHASE OUT AT @ OR

MAG OUT AT @ OR !

O

U

T

P

U

R

TE

G

S

E

L

E

R

E

G

C

T

AGC LOOP FILTER

L

R

I

E

M

G

@ OR !

I

T

+

R

E

S

H

I

R

E

GFG

T

HOLD AGC

“0”

M

U

X

AGC ERROR DETECT

AGC THRESHOLD

GAIN

ERROR

-

+

POWER

THRESHOLD

TO

CARRIER

TRACKING

AND

DISCRIMINATOR

UPPER LOWER

GAIN GAIN

LIMIT LIMIT

LOOP GAIN LOOP GAIN

EXPONENT MANTISSA

COMPARE

R THRESH

E

G

FIGURE 3. MAIN DATA PATH

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