A Wideband CATV Attenuator
●Introduction
■In cable TV line amplifiers and set-top applications, a variable attenuator is used in front of an LNA as an AGC. Figure 1 shows a block diagram of a typical transceiver used in a set-top box. The attenuator's purpose is to normalize the level of the high dynamic range multichannel TV signal. The input signal level may vary from 0 to 20 dBmV (-49 to -29 dBm) depending on the local cable network layout and standards. Thus, the attenuator should provide at least 20 dB of low distortion attenuation.
■Application note APN1003, A Wideband General-Purpose PIN Diode Attenuator, describes a PI attenuator design using four individually packaged SMP1307-011 PIN diodes with coverage from 10 MHz to 3 GHz. This application note describes a four-diode PI-type attenuator specifically designed for CATV applications with coverage to 1 GHz. The benefits of this design are the cost and space savings resulting from the SMP1320-027, a single package, four PIN diode array configured as a PI attenuator in a SOT-5 plastic package.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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October 14, 2008 |
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Rev. B |
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200327 |
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1.4 MB |
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