Parameterized description of NMR signal reception systems. Part II: S/N of NMR signal reception systems

The mathematical tools that were developed in Part I are used to show quantitatively how the signal-to-noise ratio and the ringing time depend on Q factors, and thus how overall performance can be improved. The noise factor of a model preamplifier also is considered, and the minimum noise factor is derived in terms of the impedances of the probe and of the preamplifier. The optimization of the noise factor in realistic signal reception systems is discussed.

[1]  F. D. Doty,et al.  Noise in high-power, high-frequency double-tuned probes , 1988 .

[2]  H.T. Friis,et al.  Noise Figures of Radio Receivers , 1944, Proceedings of the IRE.

[3]  M L Buess,et al.  Acoustic ringing effects in pulsed nuclear magnetic resonance probes. , 1978, The Review of scientific instruments.

[4]  D. R. Torgeson,et al.  Extremely fast recovery time receiver for pulsed NMR , 1976 .

[5]  R. Hallgren.  Paralleled transconductance ultralow‐noise preamplifier , 1988 .

[6]  H. Carr,et al.  The Principles of Nuclear Magnetism , 1961 .

[7]  N. Sullivan,et al.  Cryogenic UHF FET oscillator for magnetic resonance detection , 1988 .

[8]  Charles A. Vergers.  Handbook of Electrical Noise: Measurement and Technology , 1979 .

[9]  R. M. Cotts,et al.  Helium Cooled Radio Frequency Preamplifier for Use in NMR , 1968 .

[10]  Overcoupling NMR probes to improve transient response , 1983 .

[11]  P. R. Bevington,et al.  Data Reduction and Error Analysis for the Physical Sciences , 1969 .

[12]  M. Richards,et al.  Cryogenic GaAs FET amplifiers and their use in NMR detection , 1986 .

[13]  H. A. Haus,et al.  Representation of Noise in Linear Twoports , 1960, Proceedings of the IRE.

[14]  F. Robinson.  Noise in electrical circuits , 1962 .

[15]  Neil S. Sullivan,et al.  Parameterized description of NMR signal reception systems part I: Impedance of transmission line and probe , 1992 .

[16]  N. Sullivan,et al.  Efficient fast-recovery scheme for NMR pulse spectrometers , 1983 .

[17]  Paul Horowitz,et al.  The Art of Electronics , 1980 .

[18]  D I Hoult,et al.  Fast recovery, high sensitivity NMR probe and preamplifier for low frequencies. , 1979, The Review of scientific instruments.

[19]  M. Schnall,et al.  The application of overcoupled tank circuits to NMR probe design , 1986 .

[20]  H. Saunders,et al.  Signal Recovery from Noise in Electronic Instrumentation , 1985 .

[21]  C. Hagmann,et al.  Microwave Detector for Galactic Halo Axions , 1987 .

[22]  N. Sullivan,et al.  Low-dissipation tunable rf preamplifier for low temperature NMR applications. , 1978, Review of Scientific Instruments.

[23]  A. Ziel.  Noise in solid state devices and circuits , 1986 .

[24]  E. R. Andrew,et al.  NMR probe with short recovery time , 1987 .

[25]  Irving J. Lowe,et al.  A fast recovery pulsed nuclear magnetic resonance sample probe using a delay line , 1974 .