US3233121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low noise switching circuits
Assignee: Barnes Engineering Co
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Filing: 1962-06-01
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Granted: 1966-02-01
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Expires: 1982-06-01
Abstract
No abstract record available.
Inventors
- 👤 Wayne W Chou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:44
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/62; H03K17/6257; H03K17/16; Y; Y10; Y10S; Y10S367/00; Y10S367/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
221 words
ELECTRONIC CIRCUITS FOR THE SEQUENTIAL SAMPLING OF EXTREMELY LOW LEVEL ELECTRIC OUTPUTS FROM A PLURALITY OF SOURCES WHILE SUBSTANTIALLY ELIMINATING SWITCH GENERATED NOISE AT LOW INPUT LEVEL, COMPRISING, (A) A PLURALITY OF LOW LEVEL ELECTRIC OUTPUTS, (B) A MUCH SMALLER NUMBER OF PREAMPLIFIERS, (C) AT LEAST ONE OPERATIONAL AMPLIFIER, (D) SWITCHING MEANS CONNECTING THE INPUT OF THE OPERATIONAL AMPLIFIER TO THE OUTPUTS OF THE PERAMPLIFIERS, AND MEANS FOR ACTUATING SAID SWITCHING MEANS AT A PREDETERMINED SWITCHING FREQUENCY, (E) A SECOND SET OF SWITCHING MEANS CONNECTING THE INPUTS OF THE PREAMPLIFIERS TO THE LOW LEVEL ELECTRIC OUTPUTS, AND MEANS FOR ACTUATING SAID SECOND SET OF SWITCHING MEANS AT A LOWER FREQUENCY THAN THAT OF THE FIRST SET, THE CONNECTIONS OF THE PREAMPLIFIERS TO THE LOW LEVEL ELECTRICAL OUTPUT BEING STAGGERED SO THAT SWITCHING OCCURS BEFORE THE SWITCHING BY THE FIRST SET OF SWITCHING MEANS OF THE OUTPUT OF THE SAME PREAMPLIFIER TO THE OPERATIONAL AMPLIFIER, THE STAGGERING BEING SUFFICIENT SO THAT SWITCHING NOISE RESULTING FROM THE SECOND SET OF SWITCHING MEANS DIES DOWN BEFORE THE OUTPUT OF THE SAME PREAMPLIFIER IS SWITCHED TO THE OPERATIONAL AMPLIFIER BY THE FIRST SWITCHING MEANS, WHEREBY SWITCHING NOISE IN THE SECOND SET OF SWITCHING MEANS DOES NOT REACH THE OUTPUT OF ANY OPERATIONAL AMPLIFIER AND DOES NOT DEGRADE THE SIGNAL TO NOISE RATIO OF THE INSTRUMENT.
Claim 2
Dependent Claim
221 words
ELECTRONIC CIRCUITS FOR THE SEQUENTIAL SAMPLING OF EXTREMELY LOW LEVEL ELECTRIC OUTPUTS FROM A PLURALITY OF SOURCES WHILE SUBSTANTIALLY ELIMINATING SWITCH GENERATED NOISE AT LOW INPUT LEVEL, COMPRISING, (A) A PLURALITY OF LOW LEVEL ELECTRIC OUTPUTS, (B) A MUCH SMALLER NUMBER OF PREAMPLIFIERS, (C) AT LEAST ONE OPERATIONAL AMPLIFIER, (D) SWITCHING MEANS CONNECTING THE INPUT OF THE OPERATIONAL AMPLIFIER TO THE OUTPUTS OF THE PERAMPLIFIERS, AND MEANS FOR ACTUATING SAID SWITCHING MEANS AT A PREDETERMINED SWITCHING FREQUENCY, (E) A SECOND SET OF SWITCHING MEANS CONNECTING THE INPUTS OF THE PREAMPLIFIERS TO THE LOW LEVEL ELECTRIC OUTPUTS, AND MEANS FOR ACTUATING SAID SECOND SET OF SWITCHING MEANS AT A LOWER FREQUENCY THAN THAT OF THE FIRST SET, THE CONNECTIONS OF THE PREAMPLIFIERS TO THE LOW LEVEL ELECTRICAL OUTPUT BEING STAGGERED SO THAT SWITCHING OCCURS BEFORE THE SWITCHING BY THE FIRST SET OF SWITCHING MEANS OF THE OUTPUT OF THE SAME PREAMPLIFIER TO THE OPERATIONAL AMPLIFIER, THE STAGGERING BEING SUFFICIENT SO THAT SWITCHING NOISE RESULTING FROM THE SECOND SET OF SWITCHING MEANS DIES DOWN BEFORE THE OUTPUT OF THE SAME PREAMPLIFIER IS SWITCHED TO THE OPERATIONAL AMPLIFIER BY THE FIRST SWITCHING MEANS, WHEREBY SWITCHING NOISE IN THE SECOND SET OF SWITCHING MEANS DOES NOT REACH THE OUTPUT OF ANY OPERATIONAL AMPLIFIER AND DOES NOT DEGRADE THE SIGNAL TO NOISE RATIO OF THE INSTRUMENT.
References Cited (Backward Citations)
US2967276A
Cited
US3089091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |