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Extremely fast recovery time receiver for pulsed NMR

 

作者: D. J. Adduci,   P. A. Hornung,   D. R. Torgeson,  

 

期刊: Review of Scientific Instruments  (AIP Available online 1976)
卷期: Volume 47, issue 12  

页码: 1503-1505

 

ISSN:0034-6748

 

年代: 1976

 

DOI:10.1063/1.1134563

 

出版商: AIP

 

数据来源: AIP

 

摘要:

A radio‐frequency receiver–amplifier for pulsed nuclear magnetic resonance applications is described. This amplifier has a voltage gain of 2000 and a bandwidth of 5–115 MHz and consists of three identical stages having nonsaturating overload characteristics. Each individual stage recovers within a time of 1 nsec following a 20 dBm overload. The blocking effect of capacitive interstage coupling following rf pulses has been essentially eliminated using series‐tuned broad bandwidth resonant circuits between stages. Measured receiver recovery times range from 250 nsec for short (400 nsec) transmitter pulses to 2.0 &mgr;sec for long (75 &mgr;sec) pulses. The effective receiver input noise voltage measured following phase‐sensitive detection and at the output of a video amplifier having a bandwidth of 320 kHz was 1.2 &mgr;V.

 

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