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2. RF Amplifier Circuit
RFINP
2
34
35
RFINN
AGCG
2-1. Input stage
The differential RF signal for data read from pick up may feed into IC101 pin 34 and pin 35.
2-2. AGC (Automatic Gain Control) Loop
This RF signal is controlled to 0.5 Vpp in VGA.
The capacitor which is connected in 31 pin is used to control constant level of amplitude.
The capacitor which is connected in 32 pin is used to control DC offset of RF signal.
2-3. Equalizer
EQ boost gain is controlled by u-com and register ¡ BST¡– .
Fc of EQ is linear by real velocity and feed into IC101 13pin and changed by current differentially.
IC101
VGA
AGCO
31
32
RF Amplifier Circuit
BST
For boost
x1
EQ
x1
For fc
13
1.65V
0.5Vpp
24
98
ARF
NARF
23
99
0.5Vpp
IC201
Slicer
PLL
PWM
81
19
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