Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1991-08-26
1992-09-29
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328 16, 307529, H03B 1900, H03D 1300
Patent
active
051516616
ABSTRACT:
A linear FM waveform generator employs direct digital synthesis and includes a digital linear FM signal generator, a digital-analog converter, and a sampler means. The linear FM waveform generator includes a frequency slope register coupled to a first stage integrator which in turn is coupled to a second stage integrator, all of which operate off a system clock. The output signal from the second stage integrator represents phase as a quadratic function of time. A stored sine look-up table is referenced to generate an output digital signal representing amplitude as a function of time. The output digital signal is converted to an analog linear FM waveform which in turn is coupled to a sampler that includes a step recovery diode and a fast switch. The sampler aperture is sufficiently small that the sampler output linear FM waveform includes base and higher harmonic spectra with amplitude attenuation small enough to enable a third or higher harmonic spectra to be used for generation of the output linear FM waveform. The sampler output is filtered to pass a higher harmonic spectra which is directly coupled to output multiplication and filter circuitry.
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patent: 4625177 (1986-11-01), Conway et al.
patent: 4926130 (1990-05-01), Weaver
patent: 5028887 (1991-07-01), Gilmore
"A Direct Digitally Synthesized Exciter Achieving Near Theoretical Performance for an Operational SAR Systems" Gallaway et al., 1988 IEEE.
"Model 2040 800 Npoint/s Polynomial Waveform Synthesizer", Analogic Product Data Sheet, 1989.
"32-bit DDS Phase Accumulator, 1.0 GHz Clock Rate", GaAs IC data book and designers catalog, Gigabit, 1988, pl. 153.
"Model TW6112 8 bit, 1 GHz DAC", Triquint Data Sheet, 1987.
"STEL-2173 1 GHz 32-bit GaAs MNCO", Integrated Circuits Frequency Synthesis Products data sheet.
Caldwell Stephen P.
Merrell, Jr. Thomas D.
Maire D. G.
Miller Stanley D.
Tran Sinh N.
Westinghouse Electric Corp.
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