Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1981-07-17
1984-01-10
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
324 79R, 324 83A, 328133, 330289, G01R 2500
Patent
active
044255438
ABSTRACT:
A low noise RF signal phase comparator comprised of two high stability driver-buffer amplifiers (16 and 18) driving a double balanced mixer (14) which operate to generate a beat frequency between the two RF input signals coupled to the amplifiers from the RF sources. The beat frequency output from the mixer is applied to a low noise zero crossing detector (20) which generates a square wave output whose positive and negative going edges provide a measure of the phase difference between the two RF inputs. Temperature stability is provided by mounting the amplifiers (16 and 18) and mixer (14) on a common circuit board (29) with the active circuit elements (62, 68, 70, 82, 88, 90, 110) thereof being located on one side of a circuit board (29) while the passive circuit elements (112) are located on the opposite side. A common heat sink (28) consisting of a relatively thick metal plate of relatively large mass and having a plurality of recesses or bores (31, 33, 35, 37, 39, 41) formed therein is located adjacent the circuit board (29) such that the active circuit elements (62, 68, 70, 82, 88, 90, 110) are embedded into the bores which has the effect of slowing down the effect of ambient temperature changes and reduces the temperature gradients between the active circuit elements, and thus improving the cancellation of temperature effects inherent in such devices. Additionally, the two amplifiers (16 and 18) include individual voltage regulators (70 and 90) which effectively increases RF isolation by reducing cross-talk through the power supply connected thereto.
REFERENCES:
patent: 3048782 (1962-08-01), Altman
patent: 3187195 (1965-06-01), Stefanov
patent: 3359504 (1967-12-01), Bento et al.
patent: 4246497 (1981-01-01), Lawson
Adams William A.
Reinhardt Victor S.
Bushnell Robert E.
Manning John R.
The United States of America as represented by the Administrator
Tokar Michael J.
Tresansky John O.
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