Digitally controlled analog flux sensing ferrite phase shifter d

Details Digitally controlled analog flux sensing ferrite phase shifter d Digitally controlled analog flux sensing ferrite phase shifter d

1975-12-17

1976-10-26

Heyman, John S.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

328 55, 333 241, 307101, H03B 304

Patent

active

039886867

ABSTRACT:
The present invention relates to a digitally controlled phase shift network for an analog flux-sensing ferrite phase shifter driver, as would be applied in controlling the phase of individual antenna elements in phased array radar systems. The phase shift network described utilizes analog phase shifters while accepting a digital control input, and provides phase control without need for digital-to-analog converters between the analog phase shifters and their digital inputs. This is accomplished by integrating the volt-time product on the phase shifter secondary windings until the integral reaches a value corresponding to a phase shift increment of predetermined magnitude, dumping the integrator voltage between integrations, counting the number of integrate-and-dump operations to thus yield a digital measure of the phase shift achieved, and comparing such digital count against the digital control input. Nonlinearity of the differential phase-versus-flux characteristics of conventional phase shifters is compensated by causing the volt-time integration dump point to change upon reaching a predetermined point in the integrate-and-dump count.

REFERENCES:
patent: 3188493 (1965-06-01), Malagari
patent: 3510675 (1970-05-01), Johnson, et al.
patent: 3582953 (1971-06-01), Martner
patent: 3699584 (1972-10-01), Hrivnak et al.
patent: 3835397 (1974-09-01), D'Antonio

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