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| 型號： | HOMESTEREOS |
| 英文描述： | (395.50 k) |
| 中文描述： | （395.50十一） |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 778K |
| 代理商： | HOMESTEREOS |
LA1175, 1175M
No.2276-13/14
Description of AGC circuit in the LA1175, 1175M
The LA1175, 1175M are designed so that AGC is operated in the order shown below.
ANT damping (PIN diode)
→
MOS FET 2nd gate voltage control
(Attenuation)20dB
The following are the reasons why AGC is operated in this order.
(1) When a signal of 110dBμ or greater is applied to the varactor in the ANT circuit, intermodulation may occur. In
this case, if AGC is operated in the order of MOS FET 2nd gate control AGC
→
ANT damping (PIN diode), the
input to the varactor in the ANT circuit is not restricted unless a strong signal with AGC attenuation 60dB or
greater is given. Therefore, AGC should be operated in the order shown above.
(2) If the two AGC loops (AGC loop (ANT damping) and AGC loop (MOS FET 2nd gate control)) are operated
simultaneously, the transient response of AGC loses stability. Therefore, the order shown below is
impracticable.
MOS FET 2nd gate control
→
ANT damping
→
MOS FET 2nd gate control.
(Attenuation)60dB
Ambient temperature, Ta – °C
O
f
O
Temperature Characteristic (7)
Ambient temperature, Ta – °C
V
O
Temperature Characteristic (7)
Ambient temperature, Ta – °C
O
f
O
Temperature Characteristic (7)
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