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ISL83740EVAL Datasheet(PDF) 6 Page - Intersil Corporation |
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ISL83740EVAL Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 25 page Func t i o n a l De s c r i pt ion ISL837030, ISL83740 6 FN8013.5 Demodulator (Continued) 6. Automatic Gain Control (AGC) The demodulator ASSP provides a parallel data word to be used by the AGC to optimize the dynamic range of the input signal to the demodulator. The ASSP averages the magnitude of the input baseband signal, subtracts that from a target value, and accumulates the results. The AGC value is available in either serial digital or analog form. The AGC value output is proportional to the amount by which the incoming signal’s amplitude must be increased in order for its level to reach the desired target. Therefore, an increase in the AGC value indicates that the signal level at the input to the AGC amplifier/attenuator has actually decreased. The modem operates in two different AGC modes: • Open loop is used when there is no external AGC loop implemented. • Closed loop is used when the modem’s AGC features are tobeused. For best performance, closed loop mode is suggested. This automatically sets the demodulator input level to the optimum value. The system default is open loop mode until any AGC parameter is initialized from the host. The Controller The Controller is a highly integrated device used to eliminate the complexities of interfacing with the Intersil ASSPs directly. It incorporates everything necessary to control and monitor the modem. The Controller’s processor takes high-level commands from the user and determines what is required to configure and monitor the ASSPs. This relieves the user from any real-time interfacing and algorithm implementation issues. Theexecutablefirmwareis heldinFLASH memory that is in- circuit upgradeable. This allows the user to upgrade the code or load in a new algorithm as required via the asynchronous serial port (the Monitor and Control port). Monitor and Control Software The modem PCBA is configured and monitored using Intersil’s embedded Monitor and Control (M&C) software. This software is used to set parameters such as: • modulation type • code rate • payload rate •symbol rate • output level/offset • AGC control • diagnostics • self-test • loopback •alarms • baseband loopback • Alpha (pulse shape) • statistics • BER • EVM • demodulator stress • phase & amplitude imbalance •and more For details, see the Programmer’s Reference AN9935. |
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