G - Physics – 01 – R
Patent
G - Physics
01
R
324/1
G01R 33/36 (2006.01)
Patent
CA 1067577
Application of Howard D.W. Hill and John R. Laudermilch for NUCLEAR MAGNETIC RESONANCE SPECTROMETER EMPLOYING AN IMPROVED RESONANCE SIGNAL GATING CIRCUIT ABSTRACT OF THE DISCLOSURE 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 f 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 tran- sient switching signals, tending to leak through the gate, cancel on the output line to the RF receiver.
291669
Hill Howard D.w.
Laudermilch John R.
Na
Varian Associates
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