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參數資料
| 型號： | U4935B |
| 英文描述： | MOSFET, N, TO-3PB; Transistor type:MOSFET; Current, Id cont:2A; Resistance, Rds on:10R; Case style:TO-3PB; Current, Idm pulse:4A; Power, Pd:100W; Transistor polarity:N; Voltage, Vds max:1500V RoHS Compliant: Yes |
| 中文描述： | SECAM制式解碼器 |
| 文件頁數： | 8/16頁 |
| 文件大小： | 183K |
| 代理商： | U4935B |
U4935B
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
8 (16)
Functional Description
Bell Filter
The ACC amplifier provides a C- (chrominance) signal of
a constant peak-to-peak level for the bell filter. The bell
filter is of a gyrator-capacitor type. The resonance
frequency is
4.433619 MHz
4.286 MHz
4.33 MHz
during vertical blanking
during scanning
during burst gating.
The reference frequency should be stable during the verti-
cal blanking because it is used to calibrate the filters and
the demodulator. The capacitor C7 should be connected
as close as possible to the ground Pin of the package. If
not, this can result in a resonance frequency error.
Tuning
Bell filter
VBLK pulse
C
7
7
9611724
Gain
f
Amp
ACC
CVBS
in
16
f
ref
/
ident
1
PLL
fo
4.286 MHz
f
ref
4.434 MHz
Figure 17. Block diagram of the bell filter
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