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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