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Patent US3835378A successfully refreshed from Google Patents.
US3835378A
Expired / Lapsed
US
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System for automatic gain measurement
Assignee: Cutler Hammer Inc
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Filing: 1973-12-17
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Granted: 1974-09-10
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Expires: 1993-12-17
Abstract
Abstract An automatic measurement of gain is made with an automatic noise figure indicator by adapting the indicator to take the quotient of two parameters of the device under test. Signals representing these parameters are inherently available within the automatic noise figure indicator and can be used for the measurement of gain without affecting the simultaneous measurement of noise figure.
Inventors
- 👤 F Edden
- 👤 J Engeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:17
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/28; G01R29/00; G01R29/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A system for the measurement of gain comprising: a. an automatic noise figure indicator of the type which provides a first signal at its output representing the noise figure of the device under test, b. means for producing a second signal representing the noise power output of the device under test, and c. means responsive to said first and second signals to produce a third signal representing the quotient of said noise power output divided by said noise figure, and thereby the gain of said device under test.
Claim 2
Independent Claim
88 words
A system for the measurement of gain comprising: a. an automatic noise figure indicator of the type which provides a first signal at its output representing the noise figure of the device under test, b. means for producing a second signal representing the noise power output of the device under test, and c. means responsive to said first and second signals to produce a third signal representing the quotient of said noise power output divided by said noise figure, and thereby the gain of said device under test.
Claim 3
Dependent Claim
28 words
A system as claimed in claim 1 including means for displaying a quantitative representation of said third signal in terms of the gain of the device under test.
Claim 4
Dependent Claim
49 words
A system as claimed in claim 1, wherein said noise figure indicator includes an amplifier and an automatic gain control for said amplifier, said amplifier being connected to the output of the device under test and said second signal being obtained from the output of said automatic gain control.
Claim 5
Dependent Claim
171 words
A system as claimed in claim 1, wherein said means responsive to said first and second signals comprises: a. a first logarithmic function generator having an input and an output port and receiving said first signal at its input port and producing at its output port a signal representing the logarithm of said first signal, b. a second logarithmic funCtion generator having an input and output port and receiving said second signal at its input port producing at its output port a signal representing the logarithm of said second signal, c. a subtracter having a first and second input port and an output port, said subtracter receiving at the first input port the output signal from said first logarithmic function generator and, at the second input port, the output signal from said second logarithmic function generator, said first logarithmic output signal being subtracted from said second logarithmic output signal in said subtracter to produce a signal representing the gain of the device under test at the output port of said subtracter.
Claim 6
Dependent Claim
25 words
A system as claimed in claim 4, wherein said first and second logarithmic function generators are logarithmic amplifiers and said subtracter is a differential amplifier.
Claim 7
Dependent Claim
53 words
A system as claimed in claim 4, wherein said first and second logarithmic function generators are each comprised of an analog to digital converter connected to a read-only-memory which is adapted to produce a digital output signal which is a logarithmic representation of an input signal, and said subtracter is a digital subtracter.
Claim 8
Dependent Claim
36 words
A system as claimed in claim 4, wherein said first and second logarithmic function generators are each comprised of a logarithmic amplifier connected to an analog to digital converter, and said subtracter is a digital subtracter.
Claim 9
Independent Claim
87 words
A system for the measurement of gain comprising: a. an automatic noise figure indicator of the type which provides a first signal at its output representing the reciprocal of the noise figure of the device under test, b. means for producing a second signal representing the noise power output of the device under test, and c. means responsive to said first and second signals to produce a third signal representing the product of said first and second signals, and thereby the gain of said device under test.
Claim 10
Independent Claim
87 words
A system for the measurement of gain comprising: a. an automatic noise figure indicator of the type which provides a first signal at its output representing the reciprocal of the noise figure of the device under test, b. means for producing a second signal representing the noise power output of the device under test, and c. means responsive to said first and second signals to produce a third signal representing the product of said first and second signals, and thereby the gain of said device under test.
Claim 11
Dependent Claim
262 words
A system as claimed in claim 8, wherein said means responsive to said first and second signals comprises: a. a first logarithmic function generator having an input and an output port and receiving said first signal at its input port and producing at its output port a signal representing the logarithm of said first signal, b. a second logarithmic function generator having an input and output port, and receiving said second signal at its input port and producing at its output port a signal representing the logarithm of said second signal, c. an adder having a first and second input port and an output port, said adder receiving at the first input port the output signal from said first logarithmic function generator and, at the second input port, the output signal from said second logarithmic function generator, said first logarithmic output signal being added to said second logarithmic output signal in said adder to produce a signal representing the gain of the device under test at the output port of said summer. 10. A method for the measurement of gain utilizing an automatic noise figure indicator which comprises: a. producing a first signal from the automatic noise figure indicator which represents the noise figure of the device under test, b. producing a second signal which represents the noise power output of the device under test, and c. producing a third signal in response to said first and second signals which represents the quotient of said noise power output divided by said noise figure, and thereby the gain of the device under test.
References Cited (Backward Citations)
US3619780A
Cited
US3737781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |