參數(shù)資料
型號(hào)： UPC2533GS-01
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(yè)數(shù)： 13/36頁(yè)
文件大?。?/td> 212K
代理商： UPC2533GS-01
13
μ
PC2533
2.3 MIX2 Block
Fig. 2-3 MIX2 Block
28
23
17
24
25
14
13
12
11
22
21
V
CC
Note
Xtal
R211
R212
+
R210
R209
R207
R208
Q205
Q206
Q207
Q208
Q201
Q202
Q203
Q204
Q203
OSC2
Buff2
To IF amplifier
Bias
circuit
To RF AGC circuit (Fig. 2-4)
From IF AGC (Fig. 2-6)
Current control
circuit
Note
From 10.7 MHz BPF
Note
Output impedance and input impedance of Buff2 are 2 k
and 30 k
, respectively.
MIX2 (Q201 to Q208) is a DBM with a configuration similar to that of MIX1.
The major difference from the MIX1 is that MIX2 is equipped with a current control circuit for output and is controlled
by the AGC.
Input impedance of MIX2 is 330
to match the 10.7 MHz ceramic filter. Output impedance of Buff2 is 2 k
to
match the 450 kHz ceramic filter.
IF signal input from pin 23 is also input to the detector of the RF AGC. The RF AGC is detected by both MIX1 and
MIX2 blocks.
The Buff1 and Buff2 ensure impedance matching between MIX1 and MIX2 outputs and each ceramic filter. As
a result, IFT design is not restricted by the need to match ceramic filter impedance. For turn ratio, etc., only conversion
gain need be taken input account, so it is easy to design.
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