Data Based IQ Demodulator


Posted on Feb 7, 2014

The IQ_Demod project illustrates the use of the IQ_Demod_Setup and IQ_Demod_Data components in ADS. These components are part of the ADS behavioral model suite found under the System - Data Models palette. `IQ_demod_ckt. dsn` is a schematic for the demodulator of interest. This demodulator follows the topology of the system-level demodulator constructed.


Data Based IQ Demodulator
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The modulator is constructed of the sub-circuits "MixerGilCel. dsn", "phase_shift. dsn", and "Wilkinson. dsn". "Setup_IQ_demod_ckt. dsn" is a for a behavioral model extraction of "IQ_demod_ckt. dsn" using IQ_Demod_Setup. The result is in the dataset "Setup_IQ_demod_ckt. ds". "circuit_level_ramp. dsn" is a schematic for a circuit level Circuit Envelope simulation of "IQ_demod_ckt. dsn" with I_Q waveforms that have time-varying amplitude. The result is in the dataset "circuit_level_ramp. ds". "behavioral_level_ramp. dsn" is a schematic for a behavioral level Circuit Envelope simulation with I_Q waveforms that have time-varying amplitude. "IQ_demod_ckt. dsn" is modeled behaviorally with IQ_Demod_Data along with the dataset "Setup_IQ_demod_ckt. ds". The result is in the dataset "behavioral_level_ramp. ds". "circuit_level_QAM. dsn" is a schematic for a circuit level Circuit Envelope simulation of "IQ_demod_ckt. dsn" with I_Q waveforms for a 16 QAM modulation. The result is in the dataset "circuit_level_QAM. ds". "behavioral_level_QAM. dsn" is a schematic for a behavioral level Circuit Envelope simulation of with I_Q waveforms for a 16 QAM modulation. "IQ_demod_ckt. dsn" is modeled behaviorally with IQ_Demod_Data along with the dataset "Setup_IQ_demod_ckt. ds". The result is in the dataset "behavioral_level_QAM. ds". In Figure 1, a comparison of circuit and behavioral level results is given for Circuit Envelope simulation. Both...




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