Two channel test instrument with active electronicphase shift me

Details Two channel test instrument with active electronicphase shift me Two channel test instrument with active electronicphase shift me

1974-09-12

1976-10-12

Segal, Robert

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

331 25, 324 79R, 307262, 328155, G01R 2500

Patent

active

039861139

ABSTRACT:
A network analyzer is provided with an electronically variable phase shifter in the IF portion of the reference channel, and the phase shifter is connected to sweeping signal generator (sweeper) driving the device under test. As the output frequency of the sweeper changes, the control signal to the phase shifter changes the phase shift in the IF portion of the reference channel, compensating for phase differences between the test and reference signals due to different line lengths in the two signal paths. The electronically variable phase shifter may comprise a linear phase shifter such as a phase lock loop along with a frequency mulitplier and down converter to multiply the phase shift produced by the phase shifter.

REFERENCES:
patent: 2749502 (1956-06-01), Ragazzini
patent: 2771582 (1956-11-01), Winningstad
patent: 3416087 (1968-12-01), Vargiu
patent: 3416087 (1968-12-01), Vargiu
patent: 3436647 (1969-04-01), Gobelic et al.
patent: 3460034 (1969-08-01), Tanner
patent: 3482171 (1969-12-01), Himes
patent: 3597699 (1971-08-01), Seipel
patent: 3614475 (1971-10-01), Deboo
patent: 3660763 (1972-05-01), Parzen
patent: 3675136 (1972-07-01), O'Brien
patent: 3769602 (1973-10-01), Griswold
Hewlett-Packard Journal, Feb. 1967, pp. 1-10.

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