Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Reexamination Certificate
2007-03-27
2007-03-27
Kinkead, Arnold (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Tuning compensation
C331S00100A, C331S034000, C331S17700V
Reexamination Certificate
active
10523713
ABSTRACT:
An improved apparatus and method of generating swept frequency waveforms in the field of digital lineariser technology, using a phase-locked loop frequency synthesiser, is provided.Preferably, a ramp generator120is used to apply a modulation signal to the frequency control input of a voltage controlled oscillator via a summer component110. A direct digital synthesis (DDS) reference component400is used to controllably produce a progressive shift in threshold crossing points of the signal (on line144) such as to compensate for the ramp signals generated by the generator120which is compared with the signal (on line146) from the reference frequency source (line140).Advantageously, the proposed apparatus/method finds utility in various FM CW-based radar applications.
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B. Goldberg, “Linear Frequency Modulation—Theory and Practice”RF Design, Sep. 1993, pp. 39-46.
Justin Peter
Klein Robert H
Kinkead Arnold
MBDA UK Limited
Nixon & Vanderhye P.C.
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