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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)： | 3/36頁 |
| 文件大?。?/td> | 240K |
| 代理商： | UPC2533GS-02 |
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11
PC2533
2. Operation of Each Block
2.1
FR Amplifier Circuit Block
Fig. 2-1 RF Ampliier Circuit
VCC
LPF
L4
L5
C6
33
C3
C4
C5
C7
30
35
36
34
+
C2
C1
L2
L1
Q2
Q1
L3
C9
+
R2
R1
C8
MIX1
RF AGC
LO/DXNote
4
From MIX2
Note LO : 3 V or higher
DX : 1 V or lower
In the AM band, the capacitance of a car radio antenna depends on its length, diameter, cable length, etc. Therefore,
J-FET is used in the
PC2533 to raise RF input impedance.
Since the
PC2533 raises the first IF (intermediate frequency) to 10.71 MHz, there is no need for a tuning circuit
between the RF amplifier circuit and MIX1. Instead, it employs an LPF (about 6 MHz) consisting of L4, L5 and C3
to C5 between the RF amplifier circuit and MIX1 in order to cut image frequency (21.4 MHz or higher). Because this
allows a wide-band RF amplifier circuit to be configured without using a tuning circuit, frequency sensitivity deviation
can be minimized to a high degree.
The AGC circuit consists of RF AGC1 by the PIN diode connected to the FET gate and RF AGC2 by the cascade
transistor Q1. Use a low-noise transistor even with low current for the cascade transistor Q1 (if a high-noise one is
used, the S/N ratio deteriorates).
Remark Set bias voltage for cascade transistor Q1 to VC > VB.
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