US3858112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A receiver circuit including a crystal resonator for nuclear magnetic resonance signals of two different frequencies
Assignee: Canon Anelva Corp
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Filing: 1973-09-20
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Granted: 1974-12-31
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Expires: 1993-09-20
Abstract
Abstract A receiver circuit for a nuclear magnetic resonance analyser includes a resonance circuit and an amplifier circuit. The resonance circuit includes a receiving coil for detecting nuclear magnetic resonance signals of two different frequencies and a crystal resonator connected in series with the receiving coil. The crystal resonator being chosen so that it is substantially inductive at the lower of the two frequencies and is substantially capacitive at the higher of the two frequencies. The output impedance of the resonance circuit is matched to the input impedance of an amplifier circuit to which it is attached at the two different frequencies. By use of this circuit signals of the two different frequencies may be amplified by a single amplifier.
Inventors
- 👤 Y Satoh
- 👤 H Funaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:01
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/36; G01R33/3621
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
A receiver circuit in a nuclear magnetic resonance analyzer for simultaneously receiving nuclear magnetic resonance signals of a first and a second discrete frequency comprising resonance circuit means to produce resonance circuit output signals in response to said nuclear magnetic resonance signals and amplifier means connected to said resonance circuit means to amplify said resonance circuit output signals to produce receiver output signals corresponding to said nuclear magnetic resonance signals; said resonance circuit means including a receiving coil for detecting said nuclear magnetic resonance signals and a crystal resonator, said crystal resonator being connected in series between said receiving coil and said amplifying means, said crystal resonator having impedance characteristics such that said resonator performs substantially as an inductive element at said first frequency and substantially as a capacitive element at said second frequency.
Claim 2
Dependent Claim
134 words
A receiver circuit in a nuclear magnetic resonance analyzer for simultaneously receiving nuclear magnetic resonance signals of a first and a second discrete frequency comprising resonance circuit means to produce resonance circuit output signals in response to said nuclear magnetic resonance signals and amplifier means connected to said resonance circuit means to amplify said resonance circuit output signals to produce receiver output signals corresponding to said nuclear magnetic resonance signals; said resonance circuit means including a receiving coil for detecting said nuclear magnetic resonance signals and a crystal resonator, said crystal resonator being connected in series between said receiving coil and said amplifying means, said crystal resonator having impedance characteristics such that said resonator performs substantially as an inductive element at said first frequency and substantially as a capacitive element at said second frequency.
Claim 3
Dependent Claim
47 words
A receiver circuit as claimed in claim 1, wherein the impedance-versus-frequency characteristics of said crystal resonator are chosen such that said first frequency lies above the series resonance frequency of said crystal resonator and said second frequency lies above the parallel resonance frequency of said crystal resonator.
Claim 4
Dependent Claim
20 words
A receiver circuit as claimed in claim 1, wherein said first frequency is within the passband of said crystal resonator.
Claim 5
Dependent Claim
27 words
A receiver circuit as claimed in claim 1, wherein the output impedance of said resonance circuit means is matched to the input impedance of said amplifier means.
Claim 6
Dependent Claim
186 words
A receiver circuit for a nuclear magnetic resonance analyser which simultaneously receives nuclear magnetic resonance signals at both a higher and a lower discrete frequency, said receiver circuit including resonance circuit means and amplifier means, said resonacne circuit means including a receiving coil for detecting said resonance signals, said coil having a first and a second terminal, said first terminal being connected to a reference voltage, and resonance means including said receiving coil for producing resonance circuit output signals in response to said nuclear magnetic resonance signals detected by said coil, said amplifier means being connected to said resonance circuit means for amplifying said resonance circuit output signals to produce receiver output signals corresponding to said nuclear magnetic resonance signals wherein said resonance circuit means includes a crystal resonator connected to said second terminal of said coil so that siad resonator is connected in series between said receiving coil and said amplifier means, said crystal resonator serving substantially as an inductive element in said resonance circuit means at said lower discrete frequency and as capacitive element in said resonance circuit means at said higher discrete frequency.
Claim 7
Dependent Claim
186 words
A receiver circuit for a nuclear magnetic resonance analyser which simultaneously receives nuclear magnetic resonance signals at both a higher and a lower discrete frequency, said receiver circuit including resonance circuit means and amplifier means, said resonacne circuit means including a receiving coil for detecting said resonance signals, said coil having a first and a second terminal, said first terminal being connected to a reference voltage, and resonance means including said receiving coil for producing resonance circuit output signals in response to said nuclear magnetic resonance signals detected by said coil, said amplifier means being connected to said resonance circuit means for amplifying said resonance circuit output signals to produce receiver output signals corresponding to said nuclear magnetic resonance signals wherein said resonance circuit means includes a crystal resonator connected to said second terminal of said coil so that siad resonator is connected in series between said receiving coil and said amplifier means, said crystal resonator serving substantially as an inductive element in said resonance circuit means at said lower discrete frequency and as capacitive element in said resonance circuit means at said higher discrete frequency.
References Cited (Backward Citations)
US3434043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |