A Very Fast Switched-Attenuator Circuit for Microwave and RF Applications

被引：7
|
作者：
Quine, Richard W. [1 ]
Tseytlin, Mark [2 ]
Eaton, Sandra S. [2 ]
Eaton, Gareth R. [2 ]
机构：
[1] Univ Denver, Dept Engn, Denver, CO 80208 USA
[2] Univ Denver, Dept Chem & Biochem, Denver, CO 80208 USA
来源：
CONCEPTS IN MAGNETIC RESONANCE PART B-MAGNETIC RESONANCE ENGINEERING | 2010年 / 37B卷 / 02期
关键词：
excitation bandwidth; fast switching; two-pulse spin echo; EPR; SPECTROSCOPY;
D O I：
10.1002/cmr.b.20157
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
An electronic circuit was designed and constructed that can switch an RF signal between two amplitude levels at very fast speed (<10 ns). The circuit incorporates a TTL control for convenient interfacing of the existing equipment. The attenuation of the more attenuated state can be adjusted to be up to 12 dB more than for the less attenuated state. The initial application was in pulsed electron paramagnetic resonance (EPR) spectroscopy to produce a pi/2-pi pulse sequence with pulses of equal time duration and 6 dB difference in amplitude. A new method for measuring electron spin echoes for narrow, homogeneously broadened lines is described. (C) 2010 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 37B: 39-44, 2010
引用
收藏
页码：39 / 44
页数：6
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