STV0042 Просмотр технического описания (PDF) - STMicroelectronics

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STV0042

STV0042/STV0056 APPLICATION NOTE

STMicroelectronics 

STV0042/STV0056 APPLICATION NOTE

3 - APPLICATION NOTES (continued)

Figure 7 : FM Demodulation, Video Signal Rejection Filter

C25

TUNER

R18

R17

C23

L4

To FM IN

C24

Figure 8 : FM Demodulation Block Diagram

FM IN

AGC

AGC R

AMPLK R

LEVEL

DETECTOR 1

LEVEL

DETECTOR 2

Amp.

Detect

SD

AGC L

AMPLK L

VREF

Reg8 b4

RIGHT DEMODULATOR

LEFT DEMODULATOR

AGC

LEVEL

DETECTOR 1

LEVEL

DETECTOR 2

Amp.

Detect

SD

VREF

Reg8 b0

AGC STAGE

SW1

Phase

Detect

Bias

FM dev.

Select.

A

VREF

DET R

AUDIO R

CPUMP R

90

VCO

0

WATCHDOG

R SW5

SYNTHESIZER

L

AUDIO L

SW3

Phase

Detect

Bias

FM dev.

Select.

A

VREF

SW2

SW4

DET L

CPUMP L

WATCHDOG

90

VCO

0

PLL DEMODULATOR

STV0042/STV0056

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