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| 型號(hào)： | LA1175M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | FM Front End For Car Radio, Home Stereo Applications |
| 中文描述： | 調(diào)頻前端汽車收音機(jī)，家用音響應(yīng)用 |
| 文件頁(yè)數(shù)： | 13/14頁(yè) |
| 文件大?。?/td> | 778K |
| 代理商： | LA1175M |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)當(dāng)前第13頁(yè)第14頁(yè)
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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