Boots – shoes – and leggings
Patent
1989-05-01
1991-03-05
Lall, Parshotam S.
Boots, shoes, and leggings
364484, 324 77B, 331 4, 331 44, G01R 2316
Patent
active
049982176
ABSTRACT:
Microprocessor (MPU) controlled voltage controlled oscillator (VCO) linearization circuitry locks the VCO at desired low, center and high frequencies (F.sub.1, F.sub.c and F.sub.h) and measures the magnitudes of the corresponding control voltages (V.sub.1, V.sub.c and V.sub.h). Next, the VCO is swept at a nominal clock frequency to determine the times (T.sub.1, T.sub.2 and T.sub.h) that the control voltages (V.sub.1, V.sub.c and V.sub.h) occur during the sweep cycle. The control voltage of the VCO is then swept at a first and then a second rate during a sweep cycle to assure that the center frequency (F.sub.c) of the VCO occurs at the time (T.sub.c) midpoint of the sweep cycle. As a result, each VCO frequency can be determined by MPU monitoring according to the time that the VCO frequency occurs during the sweep cycle. This circuitry is useful in spectrum analyzers for indirectly determining the otherwise unknown frequency of a received signal.
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Brown Mark J.
Holcomb Don R.
Hoppal Thomas J.
Schumacher Lawrence R.
Jones Maurice J.
Lall Parshotam S.
Motorola Inc.
Zanelli Michael
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