US4581725A
Expired / Lapsed
US
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Method and system for gain selection
Assignee: Mobil Oil AS
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Filing: 1982-07-21
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Granted: 1986-04-08
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Expires: 2002-07-21
Abstract
Abstract An amplifier system repeatedly samples the voltage level of an analog signal and selects the gain to be applied to successive samplings of such signal in response to the voltage level of the sampled signals to thereby raise the amplitude of each sampled signal to a desired level.
Inventors
- 👤 Andrew J. Pilarcik, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:06
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; E; E21; E21B; E21B47/00; E21B47/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
A method for selecting the gain to be applied to successive samplings of an analog signal voltage so as to raise the amplitude of such sampled signal voltage to a desired level, comprising the steps of: (a) sampling said analog signal voltage, over a plurality of first time intervals, (b) holding said samplings of said analog voltage constant over a plurality of second time intervals, (c) converting said samplings of said analog voltage to digital data words during said second time intervals, and (d) applying said digital data words to a programmable read only memory which is programmed with a preprogrammed look-up table to select a dynamic gain which will raise the voltage level of said samplings of said analog voltage as represented by said digital data words to achieve amplitude equalization for each of said samplings of said analog signal.
Claim 2
Independent Claim
141 words
A method for selecting the gain to be applied to successive samplings of an analog signal voltage so as to raise the amplitude of such sampled signal voltage to a desired level, comprising the steps of: (a) sampling said analog signal voltage, over a plurality of first time intervals, (b) holding said samplings of said analog voltage constant over a plurality of second time intervals, (c) converting said samplings of said analog voltage to digital data words during said second time intervals, and (d) applying said digital data words to a programmable read only memory which is programmed with a preprogrammed look-up table to select a dynamic gain which will raise the voltage level of said samplings of said analog voltage as represented by said digital data words to achieve amplitude equalization for each of said samplings of said analog signal.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said first time period is on the order of 500 nano-seconds interval.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said second time period is on the order of 4.5 microseconds interval.
Claim 5
Dependent Claim
191 words
A programmable gain amplifier system comprising: (a) means for sampling the sweep of an analog signal over a plurality of first time intervals, each interval being in the order of 500 nanoseconds, (b) means for holding each of said plurality of analog signal samplings constant over a plurality of second time periods, each period being in the order of 450 microseconds, (c) an analog to digital converter for converting said analog signal samplings to digital words during said second time periods, (d) a programmable read only memory which compares said digital words with a preprogrammed look-up table to identify the dynamic gain which will raise the voltage level of the lower level analog signal samplings to a greater extent than the higher level analog signal samplings, thereby effecting amplitude equalization over the entire sweep of the analog signal, (e) an amplifying means to which said analog signal samplings are applied during said plurality of second time periods and having a plurality of selectable gain settings, and (f) means for selecting the gain setting of said amplifying means which corresponds to the desired dynamic gain identified by said programmable read only memory.
Claim 6
Dependent Claim
191 words
A programmable gain amplifier system comprising: (a) means for sampling the sweep of an analog signal over a plurality of first time intervals, each interval being in the order of 500 nanoseconds, (b) means for holding each of said plurality of analog signal samplings constant over a plurality of second time periods, each period being in the order of 450 microseconds, (c) an analog to digital converter for converting said analog signal samplings to digital words during said second time periods, (d) a programmable read only memory which compares said digital words with a preprogrammed look-up table to identify the dynamic gain which will raise the voltage level of the lower level analog signal samplings to a greater extent than the higher level analog signal samplings, thereby effecting amplitude equalization over the entire sweep of the analog signal, (e) an amplifying means to which said analog signal samplings are applied during said plurality of second time periods and having a plurality of selectable gain settings, and (f) means for selecting the gain setting of said amplifying means which corresponds to the desired dynamic gain identified by said programmable read only memory.
References Cited (Backward Citations)
US3289157A
Cited
US3636463A
Cited
US3828262A
Cited
US3919685A
Cited
US3924260A
Cited
US3958213A
Cited
US4361815A
Cited
US4453258A
Cited
US4464723A
Cited
US4451797A
Cited
US4425571A
Cited
US4426651A
Cited
US4430657A
Cited
US4494212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |