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LA1065M bảng dữ liệu(PDF) 3 Page - Sanyo Semicon Device

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Giải thích chi tiết về linh kiện  2 Tuner Diversity Circuit for Car FM Tuner
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LA1065M
No.3312-3/8
Sample Application Circuit
Unit (resistance :
Ω, capacitance : F)
Operating Principle
(1) Multi-path distortion detection
• Overview
The LA1065M compares the high frequency noise elements in the S meter output from the two tuners to perform
multi-path distortion detection.
In addition to the higher harmonic distortion due to multi-path, the S meter noise includes pulse noise such as car
engine ignition noise, distortion elements due to modulation, phase noise and so on. All of this noise causes
misoperation of multi-path distortion detection.
The LA1065M resolves this problem through use of a unique noise count comparison method and the bottom
detection-type noise AGC.
• Noise count comparison
The causes of misoperation in a diversity reception system, which are pulse noise, distortion elements caused by
modulation, and phase noise, exist almost equally for MAIN and SUB. Also, the multi-path distortion to be
detected tends to exist on either the MAIN or SUB side.
The LA1065M uses an up/down counter to compare the noise counts of MAIN and SUB and detect multi-path.
• Bottom detection noise AGC
As described above, the S meter noise also exists on both MAIN and SUB sides, so when there is noise on both
sides, AGC goes on to prevent misoperation. On the other hand, when multi-path is generated and noise is on one
side or the other, AGC does not go on, enabling high sensitivity detection.
• A combination of the above methods is used to make the LA1065M capable of accurate multi-path detection.


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