參數(shù)資料
型號: UPC2533GS-02
元件分類: 接收器
英文描述: AM, AUDIO SINGLE CHIP RECEIVER, PDSO36
封裝: 0.300 INCH, PLASTIC, SSOP-36
文件頁數(shù): 7/36頁
文件大?。?/td> 240K
代理商: UPC2533GS-02
15
PC2533
2.5
IF Amplifier Block and Detection Block
Fig. 2-5 IF Amplifier and Detection Block
Bias
circuit
19
18
17
+
R19
C19
T3
R301
R302
Q301
R304
IF amp
R303
Q302
VCC
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 T3 and C19)
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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