Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1988-01-19
1990-05-15
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328 16, 328 23, 328 25, 328 27, 328 36, 307529, 331 38, H03K 380, H03B 2102
Patent
active
049261304
ABSTRACT:
A method and apparatus for generating high frequency signals, comprising generating a fundamental frequency signal over a predefined tuning range using a direct digital synthesizer with a digital to analog converter operating at a predetermined sampling frequency and mixing the fundamental frequency with a high frequency reference signal in a mixer connected to the converter and a reference source. The reference frequency signal is provided by the reference source at a high frequency which is a multiple of the digital to analog converter sampling frequency and is the difference between a desired high frequency output and the fundamental frequency. Where desired a low pass filter is disposed between the synthesizer and the mixer and a band pass filter is disposed between the mixer and any output elements. A divide by N element can be connected between the reference source and the digital to analog converter to provide a sampling clock signal for the converter. In addition, the reference source can operate at even higher frequencies and a divide by M element is disposed between the reference source and both the divide by N element and the mixer. This allows the reference to be used for additional up conversion mixing with low noise at higher multiples of the converter sampling frequency to achieve higher output frequencies.
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Duong Tai V.
Miller Stanley D.
Qualcomm Inc.
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