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Nexxim Simulator > Voltage Source, QAM Modulated
QAM Modulated Voltage Source Netlist FormThe netlist format for a Quadrature-Amplitude modulated (QAM) voltage signal generator is: Axxxx n+ n- [M=val] [FB=val]
[D=val] n+ and n- are the positive and negative nodes. The brackets shown in bold are required. The entry COMPONENT=qam_iq_source is required. The QAM modulated signal generator can be used as a source of data for Nexxim envelope analysis. See Envelope Analysis for details.
PSK-Modulated Voltage Source Netlist ExampleAqamtest 23 53 BITFILE='C:/qamdatadirectory/qamdata.txt’ FC=2.5e9 COMPONENT=qam_iq_source Notes1. When no BITLIST or BITFILE argument is supplied, the QAM voltage source generates a pseudorandom bit sequence, starting from a random seed value. When no BITLIST or BITFILE is present, the optional SEED can be used to control the bit sequence. The SEED must be an integer value (the maximum absolute value is the maximum size of integers on your system). Using the same SEED guarantees that the same sequence of bits will be generated on each simulation. 2. When a BITLIST or BITFILE is supplied, the QAM source generates the specified sequence of 0 and 1 bits, and repeats the sequence until simulation terminates. When a BITLIST or BITFILE is present, any SEED value will be ignored. If two or all three of BITFILE, BITLIST, and SEED are present, Nexxim uses the precedence order: BITFILE > BITLIST > SEED. 3. In all cases, the sequence of generated bits starts after the time delay given by TD, and continues until the stop time (tstop) of the transient analysis is reached. 4. The parameters BITFILE =file_reference and NOISEVEC =file_reference refer to external files containing the data. See File References in the Nexxim Netlist File Format topic for details. 5. For harmonic balance analysis, the test tones must be submultiples or equal to the frequencies of the actual voltage or current inputs to the circuit. To ensure that the desired HB frequency is used with a QAM source, qualify the source by adding a TONE=tone_val entry at the end of the instance statement. The tone_val is then used in a subsequent HB statement.
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