Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-02-22
1978-06-06
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 5R, G01R 3308
Patent
active
040939111
ABSTRACT:
In a nuclear magnetic resonance spectrometer a gate is employed for time share multiplexing of the resonance and transmitter signals. An improved gate circuit is connected in series between the receiver and the resonance detecting circuit employed for picking up resonance of the sample. The improved gate circuit includes a pair of parallel connected branches of PIN diodes connected between the input and output terminals of the gate. The diodes in each parallel branch are poled toward an intermediate control node in such a manner so that a positive control potential applied to the control of one branch node turns that branch on and conversely a negative control potential applied to the other control node turns on the other branch. Equal magnitude and opposite sign control pulses are applied to the control nodes so that transient switching signals, tending to leak through the gate, cancel on the output line to the RF receiver.
REFERENCES:
patent: 3039048 (1962-06-01), Shoolery
patent: 3603871 (1971-09-01), Caunter
patent: 3670185 (1972-06-01), Vermette
Hill Howard D. W.
Laudermilch John R.
Berkowitz Edward H.
Cole Stanley Z.
Fisher Gerald M.
Tokar M.
Varian Associates Inc.
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