參數(shù)資料
型號(hào): UPC2533GS-01
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): 4/36頁
文件大?。?/td> 240K
代理商: UPC2533GS-01
12
PC2533
2.2
MIX1 Block
Fig. 2-2 MIX1 Block
Note Output impedance and input impedance of Buff1 are 330
and 15 k, respectively.
MIX1 (Q101 to Q108) is a DBM (double balanced mixer).
MIX1 output is supplied to 10.7 MHz ceramic filter via Buff1 (output impedance: 330
) for impedance matching.
The local oscillation signal is applied to the bases of Q101 to Q104, and the RF signal to the base of Q105. MIX1
(Q101 to 108) multiplies the local oscillation signal by RF signal, and converts to the resonance frequency of IFT T1
for output.
The local oscillation signal is output from pin 1 via Q109 (OSC Buff). It has an amplitude of 110 dB
V and can
be directly input to CMOS LSI for use by the PLL synthesizer.
The RF signal applied to the base of Q105 is also input to the detector of the RF AGC circuit.
1
28
33
30
23
32
17
29
27
R11
Q109
Q105
VT
T1
VCC
R107
Q106
Q107
Q108
R108
R109
R110
R111
R112
Buff1
Q104
Q103
Q102
Q101
Bias
circuit
To RF AGC circuit (Fig. 2-4)
To 10.7 MHz
BPF
From
LPF
Note
+
31
OSC1
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