Linear frequency sweep generator for continuous transmission FM

Details Linear frequency sweep generator for continuous transmission FM Linear frequency sweep generator for continuous transmission FM

1981-10-02

1983-08-09

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Transmitter systems

367102, 331178, G01S 752, H03B 2300

Patent

active

043982751

ABSTRACT:
A device for producing a varying frequency sine wave synthesized so that frequency is swept linearly with time for use in a continuous transmission FM sonar. A crystal clock, divider and a 16 bit digital output sweep counter produce 2.sup.16 counts for each sweep period T.sub.s. The 2.sup.16 counts are applied to a 16 bit digital to analog converter to provide a highly linear voltage ramp (the smoothed result of 2.sup.16 steps). The ramp is converted to a proportional frequency which is applied to a 5 bit digital counter to access a read only memory programmed to provide a digital output representing points along a sine wave. The memory output is applied to a digital to analog converter to produce a voltage output that is a 32 stepped approximation of a sinewave at a frequency which increases betweeen f.sub.1 and f.sub.2 with the linearity of the ramp voltage. A filter smoothes the output.

REFERENCES:
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patent: 3885138 (1975-05-01), Bates
patent: 4038612 (1977-07-01), Borofka et al.

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