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參數(shù)資料
| 型號： | LA1235 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | FM IF System Applications |
| 中文描述： | 調(diào)頻中頻系統(tǒng)應(yīng)用 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 1031K |
| 代理商： | LA1235 |
LA1235
No.873-11/12
Cain distribution of application circuit
If IC anone is operated without front end, the tuning meter deflects toward plus side at the time of no input. This
phenomenon is caused by the fact that the noise component to be applied to the quadrature multiplication circuit is not
syummetric with respect to 10.7MHz but is shifted toward lower frequency side because the frequency characteristic of
IF amplifier attenuates at high frequencies and the phase shift circuit is of low-pass type. If the formt end is attached and
the noise which passes through the narrowband filter of IF stage and spreads symmetrically with respect to 10.7MHz is
stronger than the noise generated inside the IC, the tuning meter reads 0.As the gain of the front end is decreased, input
limiting sensitivity and usable sensitivity worsen abruptly. This phenomenon is caused by the fact that since the tuning
meter is set to 0 at the time of no input the tuning point of the quadrature circuit must be shifted toward lower frequency
side than 10.7MHz and the demodulation output waveform is deformed asymmetrically at an input in the vicinity of
usable sensitivity. However, if the gain of the front end is too increased, the signal meter poiter does not return to zero
point at the time of no signal.
Sample Application Circuit
Unit (resistance :
, capacitance : F)
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