Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2006-10-03
2006-10-03
Malzahn, D. H. (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
Reexamination Certificate
active
07117234
ABSTRACT:
A waveform generator for use in IQ modulation in a wireless cellular device having an FM waveform generator (104) that is programmable to generate a desired FM frequency deviation; a digital accumulator (108, 110, 112) to provide phase generation.First and second look-up tables114and116use the 6 MSBs and the 6 LSBs of 12-bit digital accumulator values to look up phase-space values that are combined in complex multipliers (130, 140), which are re-used from other parts of the circuit.This provides the following advantage(s):Support of both FM and I/Q modulation techniques for constant envelope modulation; low cost implementation; and flexibility to address multimode systems.
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Freescale Semiconductor Inc.
Malzahn D. H.
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