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LA1135 Datasheet(PDF) 9 Page - Sanyo Semicon Device |
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LA1135 Datasheet(HTML) 9 Page - Sanyo Semicon Device |
9 / 18 page 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 Test conditions Double-tuning ANT input level at which ANTD is turned ON when f u = 1.4 MHz is inputed at fr = 1 MHz Resistor value, R – Ω 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: Ω, capacitance: F) 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 Ω 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- tuning Equivalent capacitance available (Capacitance is desirable because of a slight change in ANT damping in the band) (Approximately 3000 pF) Unit (resistance: Ω, capacitance: F) Double- tuning LA1135, 1135M No. 1272-9/18 |
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