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Patent Searching and Data


Title:
TRANSCEIVER CIRCUIT FOR NMR
Document Type and Number:
Japanese Patent JPH0526994
Kind Code:
A
Abstract:

PURPOSE: To obtain a transceiver circuit which can efficiently supply high-frequency pulses into a probe up to a high frequency region.

CONSTITUTION: High-frequency pulses from a transmitting circuit 1 are sent into a probe 2. The resonance signal from the probe 2 is sent into a receiving circuit 4 through a transmission line transformer 3. A switching circuit 5 is inserted into the primary side of the transmission line transformer 3. In order to turn ON and OFF the switching circuit 5, a peak detecting circuit 6 and a driving circuit 8 for driving the switching circuit 5 based on a blanking signal are provided. A negative voltage is outputted from the peak detecting circuit 6 during the period wherein the high-frequency pulses are generated. Thus, the switching circuit 5 is not biased and the impedance of the transmission line transformer becomes high. as a result the high-frequency pulses flows into the probe. During the period wherein the high-frequency pulses are not generated (receiving period), the driving circuit 8 is ON, and the switching circuit becomes also ON. The impedance of the transmission line transformer becomes low. Therefore, the resonance signal from the probe is sent into the receiving circuit 4.


Inventors:
IMAIZUMI JUNJIRO
Application Number:
JP1991000207506
Publication Date:
February 05, 1993
Filing Date:
July 24, 1991
Export Citation:
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Assignee:
JEOL LTD
International Classes:
G01R33/36; G01R33/32; (IPC1-7): G01R33/32