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FSD270TA Datasheet(PDF) 3 Page - Zetex Semiconductors |
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FSD270TA Datasheet(HTML) 3 Page - Zetex Semiconductors |
3 / 5 page APPLICATIONS INFORMATION FSD270 in Digital Audio Broadcasting (DAB) Circuits Digital audio is set to dominate car radio and other mobile radio applications. Most of the required functions can be achieved with a single integrated circuit. One parts of the circuit that are not integrated are the Voltage Controlled Oscillator (VCO) used in the Phase-Locked Loop (PLL) channel selection circuit and the tracking filters. Figure 1 shows the FSD270 dual variable capacitance diode (also known as varactor or tuner diode) in a DAB application. Most textbook circuits show a single variable capacitance diode in place of the FSD270. In practice radio frequency oscillations in the tracking filters can drive the single diode into conduction on peaks increasing the bias voltage and giving rise to undesirable harmonics. Common-cathode variable capacitance diodes are used to overcome this problem. The FSD270 dual common cathode device in the space saving SOT23 package has been optimized for this application. Zetex application note AN9 covers our range of variable capacitance diodes and their applications in detail. FSD270 ISSUE 1 - AUGUST 2002 3 Figure 1. |
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