Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synthesizer
Reexamination Certificate
2005-03-15
2005-03-15
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synthesizer
C327S107000, C327S355000, C341S147000
Reexamination Certificate
active
06867625
ABSTRACT:
A signal synthesizer according to the present invention produces a high speed or high frequency carrier waveform without employing an ASIC or FPGA operating at a sampling rate of greater than twice the carrier frequency. The signal synthesizer basically simulates a high speed or high frequency direct digital synthesizer with a plurality of low speed or low frequency direct digital synthesizers. The low speed synthesizers are operated in parallel and each one produces an intermediate carrier waveform with a frequency less than the desired carrier frequency. The intermediate carrier waveforms are subsequently multiplexed together to form a high frequency digital carrier waveform that is subsequently converted to an analog signal with a high-speed digital-to-analog converter. In addition, the signal synthesizer may perform phase, frequency and/or amplitude modulation.
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Callahan Timothy P.
Edell Shapiro & Finnan LLC
ITT Manufacturing Enterprises Inc.
Luu An T.
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