參數(shù)資料
型號： UPC2533
廠商： NEC Corp.
英文描述： AM TUNER FOR ELECTRONIC TUNING CAR RADIOS
中文描述： 上午調(diào)諧器電子調(diào)諧汽車收音機(jī)
文件頁數(shù)： 15/36頁
文件大小： 212K
代理商： UPC2533
15
μ
PC2533
2.5 IF Amplifier Block and Detection Block
Fig. 2-5 IF Amplifier and Detection Block
B
19
18
17
–
+
R19
C19
T3
R301
R302
Q301
R304
IF amp
R303
Q302
V
CC
From 450kHz BPF
To SD circuit
Audio
output
From IF AGC circuit
(Fig. 2-6)
To IF AGC circuit
(Fig. 2-6)
15
+
In the IF amplifier block, DC feedback is carried to pin 19 via an external low pass filter (composed of T
3
and C
19
)
from pin 18, an output pin. The DC electric potential of pin 18 is designed to be fixed approximately equal to the (+)
side input of the IF amplifier. The value of R19 is the input impedance, so impedance matching to 450 kHz ceramic
filter is possible.
The output signal current of the IF amplifier is converted to signal voltage by being resonated by T3 and input to
the detection circuit after frequency selection.
Emitter follower detection by Q302 is adopted for the detection circuit block.
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