Coded data generation or conversion – Code generator or transmitter – With variable pulse spacing or grouping
Patent
1992-03-09
1993-10-12
Yusko, Donald J.
Coded data generation or conversion
Code generator or transmitter
With variable pulse spacing or grouping
307239, 307265, 307269, 341173, 341178, 364718, H03K 504, H03K 513
Patent
active
052529770
ABSTRACT:
A digital architecture for a pulse generator includes a triggerable voltage controlled oscillator (VCO) with two alternative sources of frequency control voltage, an internal DAC or a phase frequency comparison with an external timebase. In a top octave of operation, the output of the triggerable VCO is used to produce output pulses whose edge locations are then adjusted by small digital increments or "slivers" and very small analog increments or "verniers". In lower octaves of operation, the contents of a pattern RAM serve to frequency divide the triggerable VCO output frequency by powers of two. The RAM contents are converted to a serial bit stream that imposes the coarse pulse width and period as an integral number of top octave periods, or quanta. The edge locations are then adjusted with slivers and verniers, as in the top octave. Automatic calibration facilities are included. This architecture provides controllable tolerances, permits accurate positioning of a trigger out signal relative to any pulse produced, allows the user to specify the trailing edge timing directly, and permits both pulse width and phase to be specified as a percentage of the overall period and automatically kept proportional when the frequency is varied. It allows synchronized operation of different channels at rates related by powers-of-two, and permits disabling of a channel at an operator determined voltage level. A means for determining, by the use of an external signal, when bursts of pulses synchronized to an external frequency source will begin, is also provided.
REFERENCES:
patent: 4667302 (1987-05-01), Mackey et al.
patent: 4680479 (1987-07-01), Alonso
patent: 4791384 (1988-12-01), Mackey et al.
Hengeveld John
Lueker Jonathan
Needham Brad
Price Burt
Schlegel Jim
Giust John
Gray Francis I.
Griffith Boulden G.
Smith-Hill John
Tektronix Inc.
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