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参数资料
| 型号： | LA1193V |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分类： | 调谐器 |
| 英文描述： | AUDIO TUNER, PDSO20 |
| 封装： | SSOP-20 |
| 文件页数： | 4/22页 |
| 文件大小： | 1035K |
| 代理商： | LA1193V |
LA1193M, 1193V
No.4715-12/22
5. IF Amplifier
This IF amplifier is a single stage differential amplifier.
Specifications
Input impedance :
330
Output impedance : 330
Gain :
25dB
Gain adjustment can be provided using either of the methods shown.
IF Gain adj
Temperature Characteristics
The LA1193M/V uses Vref temperature characteristics correction to hold the gain temperature characteristics to the
low level of about 1dB over the range
30 to +80°C.
6. AGC Circuit
The LA1193M/V uses pin diode antenna damping (pin 9) and MOSFET second gate voltage control (pin 16) for AGC.
The AGC operating sequence is as follows :
Antenna damping (pin diode)
→ MOSFET second gate voltage control
(attenuation) 20dB
(attenuation) dB
The above AGC sequence is used for the following reasons.
Intermodulation distortion can occur if a signal of 110dB or larger is input to the antenna circuit varactor diode.
In such situations, if the AGC sequence was MOSFET second gate voltage control followed by pin diode antenna
damping, as long as the receiver was not in a strong field where the 60dB or higher AGC attenuation operates, input
limitation due to the antenna circuit varactor diode would operate. Therefore, we feel that the AGC operating
sequence employed is appropriate.
Consider the problem of AGC loop stability. If the two AGC loops (the antenna damping AGC loop and the MOSFET
second gate control AGC loop) operate, the AGC system would become unstable and have an excessively large
influence on the transient response. Therefore the following structure cannot be used.
MOSFET second gate control
→ antenna damping → MOSFET second gate control
The AGC operating conditions are the same as those for the LA1175M.
Narrow AGC circuit
Since the LA1193M/V’s N-AGC (which detects the mixer output) is set to have a high sensitivity, care is required to
avoid incorrect operation. In particular, there must be adequate separation from the local oscillator block on the
printed circuit board pattern. Also, a resistor of at least 500
must be inserted at the pin 13 input. A low-pass filter is
formed by the insertion of this resistor. This low-pass filter prevents incorrect AGC operation due to the local
oscillator.
The AGC sensitivity setting can be changed by adjusting the
value of the capacitor connected at pin 13. Although the AGC
sensitivity can be lowered by increasing the value of the series
resistor, caution is required since the AGC has its own frequency
characteristics.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LA119B-4G-PF | 制造商:LIGITEK 制造商全称:LIGITEK electronics co., ltd. 功能描述:LED ARRAY |
| LA119B-4G-PF-0 | 制造商:LIGITEK 制造商全称:LIGITEK electronics co., ltd. 功能描述:LED ARRAY |
| LA119B-XGGH-PF-0 | 制造商:LIGITEK 制造商全称:LIGITEK electronics co., ltd. 功能描述:LED ARRAY |
| LA11B-1 | 制造商:LIGITEK 制造商全称:LIGITEK electronics co., ltd. 功能描述:LED ARRAY |
| LA1201 | 制造商:SANYO Semiconductor Co Ltd 功能描述: |
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