Coded data generation or conversion – Phase or time of phase change – Synchro or resolver signal
Patent
1988-11-01
1989-08-08
Shoop, Jr., William M.
Coded data generation or conversion
Phase or time of phase change
Synchro or resolver signal
318654, 318655, 324 83D, H03M 164
Patent
active
048557447
ABSTRACT:
A system for producing a digital representation of the value of an angle .theta., typically a phase angle, from two analog input quantities representative of A sin .theta. and A cos .theta., where A is an amplitude factor, comprises logarithmic amplifiers (IC1-IC4) which produce analog representations of a plurality of quantities (sin .theta., cos .theta., sin (.theta.+3.pi./4), cos (.theta.+3.pi./4)) derived from the two input quantities and which are arranged to add or subtract their outputs to produce quantities (V.sub.1 -V.sub.4) which are independent of A and the value of each of which lies within a predetermined range (-C to +C) in at least one respective portion (2.pi.
) of an angular range for .theta. of 2.pi. radians. The digital representation of .theta. is the concatenation of digital representations of the angular portion (2.pi.
) in which .theta. lies and of the value of .theta. within the portion that is derived from the selected appropriate one of the quantities V.sub.1 -V.sub.4 with an analog to digital converter. Such a system enables high resolution to be obtained at a high operating speed. Suitably, the quantities V.sub.1 -V.sub.4 vary linearly with .theta. in their respective angular portions and are [log tan] functions of .theta..
REFERENCES:
patent: 4390865 (1983-06-01), Lauro
patent: 4598289 (1986-07-01), Marin et al.
patent: 4754259 (1988-06-01), Joseph et al.
Hoff Marc S.
Shoop Jr. William M.
U.S. Philips Corporation
Wieghaus Brian J.
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