GB1433397A - Receiver circuits for nuclear magnetic resonance analysers - Google Patents
Receiver circuits for nuclear magnetic resonance analysersInfo
- Publication number
- GB1433397A GB1433397A GB4464173A GB4464173A GB1433397A GB 1433397 A GB1433397 A GB 1433397A GB 4464173 A GB4464173 A GB 4464173A GB 4464173 A GB4464173 A GB 4464173A GB 1433397 A GB1433397 A GB 1433397A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crystal
- frequencies
- resonant
- frequency
- sept
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005481 NMR spectroscopy Methods 0.000 title 1
- 239000013078 crystal Substances 0.000 abstract 8
- 239000003990 capacitor Substances 0.000 abstract 3
- 230000005284 excitation Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3621—NMR receivers or demodulators, e.g. preamplifiers, means for frequency modulation of the MR signal using a digital down converter, means for analog to digital conversion [ADC] or for filtering or processing of the MR signal such as bandpass filtering, resampling, decimation or interpolation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
- H03F1/22—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
- H03F1/226—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively with junction-FET's
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/191—Tuned amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
1433397 Filter circuits NIPPON ELECTRIC VARIAN Ltd 24 Sept 1973 [30 Sept 1972] 44641/73 Heading H3U [Also in Division G1] The signal pick-up coil of an NMR spectrometer is connected to a crystal resonator so as to be resonant at two frequencies, the crystal being such that at the higher of the two frequencies it acts as a capacitor and at the lower of the two it acts as an inductor. The two frequencies may be from a nucleus being investigated (e.g. 60 MHz) and a <SP>2</SP>H nucleus for field locking (e.g. 9 MHz). The narrow bandwidth of Ae crystal allows the fundamental frequency of the RF magnetic excitation to be eliminated. The impedance of the crystal is shown in Fig. 4; the higher frequency must lie above f p , the crystals parallel resonant frequency, and the lower frequency must lie between f p and f o , the series resonant frequency of the crystal. Fig. 3 shows an embodiment in which the pickup coil 20 forms a resonant circuit with crystal 43 and capacitors 41, 42. The two resonant frequencies are passed to transistor 50 and separated by inductors and capacitors in the collector circuit to give outputs F 1 , F 2 . Equivalent circuits at these two frequencies are given, Figs. 5, 6 (not shown). In another embodiment, Figs. 9-11 (not shown), the two frequencies at extracted at opposite sides of the crystal and are separately amplified.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9764272A JPS5420874B2 (en) | 1972-09-30 | 1972-09-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1433397A true GB1433397A (en) | 1976-04-28 |
Family
ID=14197767
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4464173A Expired GB1433397A (en) | 1972-09-30 | 1973-09-24 | Receiver circuits for nuclear magnetic resonance analysers |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPS5420874B2 (en) |
CA (1) | CA993950A (en) |
GB (1) | GB1433397A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0155978A1 (en) * | 1984-03-29 | 1985-10-02 | Oxford Research Systems Limited | Method of operating a nuclear magnetic resonance spectrometer |
EP0166953A1 (en) * | 1984-06-07 | 1986-01-08 | Siemens Aktiengesellschaft | Apparatus for nuclear spin tomography |
-
1972
- 1972-09-30 JP JP9764272A patent/JPS5420874B2/ja not_active Expired
-
1973
- 1973-09-24 GB GB4464173A patent/GB1433397A/en not_active Expired
- 1973-09-28 CA CA182,192A patent/CA993950A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0155978A1 (en) * | 1984-03-29 | 1985-10-02 | Oxford Research Systems Limited | Method of operating a nuclear magnetic resonance spectrometer |
EP0166953A1 (en) * | 1984-06-07 | 1986-01-08 | Siemens Aktiengesellschaft | Apparatus for nuclear spin tomography |
Also Published As
Publication number | Publication date |
---|---|
CA993950A (en) | 1976-07-27 |
JPS5420874B2 (en) | 1979-07-26 |
JPS4962183A (en) | 1974-06-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |