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參數(shù)資料
| 型號： | LA1193M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | High-Performance FM Front End for Car Radios |
| 中文描述： | 高性能調(diào)頻前端的汽車收音機(jī) |
| 文件頁數(shù)： | 9/21頁 |
| 文件大?。?/td> | 766K |
| 代理商： | LA1193M |
This double wide-band AGC system consists of two AGC circuits and a narrow AGC (pin 13 input, mixer input
detection type) as shown in Figure 1. Figure 2 shows the antenna input frequency characteristics.
Figure 2 AGC Sensitivity Detuning Characteristics
Features of the Double Wide AGC System
— Since this is a mixer input detection wide-band AGC, it prevents the occurrence of intermodulation due to
interfering stations with
f > 1 MHz. (TV band interference prevention)
— Since this system uses a narrow AGC at the same time, the wide AGC sensitivity can be lowered, thus
preventing incorrect operation due to local oscillator injection.
— Optimal sensitivities for any field conditions can be set, since the sensitivities of both the wide and narrow
AGC systems can be set by changing the values of external components.
— The input level of the desired station is limited by the narrow AGC. As a result, excessive levels are no longer
input to the stages that follow the mixer and the beats at multiples of 10.7
×
A are reduced.
Two-Signal Sensitivity Suppression Characteristics
Previously, keyed AGC systems were used to provide good intermodulation distortion and two signal sensitivity
suppression characteristics at the same time. However, in previous keyed AGC systems, when the desired station
would fade or drop out, the wide band AGC level would become essentially zero. As a result, the automatic station
selection function would malfunction and blocking oscillation would occur in the presence of strong interfering
stations. Thus keyed AGC systems were extremely hard to use in actual practice. Sanyo has developed a new AGC
system (3D-AGC) that solves these problems and allows the construction of extremely simple application circuits.
The LA1193M/V incorporates this AGC system.
What is the 3D-AGC system
It is a system that determines the wide-band AGC level by using information that has the following three frequency
characteristics.
No. 4715-9/21
LA1193M, 1193V
RF and antenna circuit information
Mixer circuit information
C, F and selectivity information
Mixer input AGC
Mixer output AGC
S-meter output
Three
dimensions
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相關(guān)代理商/技術(shù)參數(shù) |
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| LA1193M_08 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:High-Performance FM Front End |
| LA1193V | 制造商:SANYO Semiconductor Co Ltd 功能描述:AUDIO TUNER, 20 Pin Plastic SMT |
| LA119B-4G-PF | 制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY |
| LA119B-4G-PF-0 | 制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY |
| LA119B-XGGH-PF-0 | 制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY |
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