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參數(shù)資料
| 型號： | LA1135 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | AM Tuner System for Car Radios and Home Stereos(應(yīng)用于車載電臺和家庭立體聲的AM調(diào)諧器) |
| 中文描述： | 上午調(diào)諧器系統(tǒng)的汽車收音機(jī)和家庭音響（應(yīng)用于車載電臺和家庭立體聲的上午調(diào)諧器） |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 455K |
| 代理商： | LA1135 |
16. Measure against suppression of sensitivity in the presence of an undesired signal of high strength
(Sample application where two PIN diodes are used in the antenna damping circuit)
The LA1135 contains the wide-band AGC circuit (wide-band AGC with pin 2 input) against cross modulation which occurs
because an undesired signal of high strength distorts the FET input. The AGC = ON level depends on the value of external
resistor R3 as shown below.
When a nonlinear element, such as transistor, is used for antenna damping, cross modulation which occurs when the transistor is
turned ON is as shown below.
The dynamic range of the FET input covers up to approximately 110 dBμ of antenna input, but the AGC-ON level must be set
lower because of the bad effect shown above.
Therefore, there are some cases where it is difficult to receive a desired signal of low strength in the presence of an an undesired
signal of high strength. To solve this problem, a sample application circuit where two PIN diodes with good linearity are used for
antenna damping and its cross modulation characteristic are shown below.
Sample Application Circuit where two PIN diodes are used for ANT damping
W
Test conditions
Double-tuning
ANT input level
at which ANTD is turned ON when
f
u
= 1.4 MHz is inputed at f
r
= 1 MHz
Resistor value, R –
Cross modulation characteristic which is caused
by the ANT Tr when the
LA1135 wide-band
AGC-ON level (with
pin 2 input) is varied
Unit (resistence:
, capacitance: F)
O
Cross Modulation Characteristics
Desired:1.0 MHz 400 Hz 30% mod 74 dBμ
Undesired: 1.4 MHz non-mod
Wide-band AGC (pin 2 input)75
Desired: 1.0 MHz 400 Hz
non-mod 74 dBμ
Undesired: 1.4 MHz 1 kHz
80% mod
Cross modulation which occurs when the
transistor for ANT damping is turned ON
Undesired input – dBμ
Double-
Equivalent capacitance available
(Capacitance is desirable because
of a slight change in ANT damping
in the band)
(Approximately 3000 pF)
Unit (resistance:
, capacitance: F)
Double-
tuning
LA1135, 1135M
No. 1272-9/18
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PDF描述 |
|---|---|
| LA1136N | AM Tuners for Car Radios and Home Stereos(應(yīng)用于車載電臺和家庭立體聲的AM調(diào)諧器) |
| LA1140 | FM IF System for Car Radio |
| LA1143 | FM IF System for Car Radios |
| LA1145 | FM IF System (Quadrature Detector) for Car Radio |
| LA1145M | FM IF System (Quadrature Detector) for Car Radio |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA11352 | 制造商:Square D by Schneider Electric 功能描述:CIRCUIT BREAKER AUXILIARY SWITCH 2A/2B |
| LA1135M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuner System for Car Radios and Home Stereos |
| LA1136 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos |
| LA1136M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA1136N | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos |
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