Patent US3720946A successfully refreshed from Google Patents.
US3720946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logarithmic receiver device which compensates for received signal strength
Assignee: Bendix Corp
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Filing: 1966-12-15
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Granted: 1973-03-13
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Expires: 1986-12-15
Abstract
Abstract A logarithmic amplifier for automatically compensating for nonlinear input detectors having a voltage divider network in combination with a plurality of nonlinearly operated transistors. Particularly, the transistors have a control terminal connected to the voltage divider network for receiving logarithmic portions of the input voltage and a common output terminal for summing the outputs of the transistors.
Inventors
- 👤 H Chow
- 👤 D Payne
- 👤 W Faris
- 👤 H Lynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:39
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/28; G01S3/32
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
125 words
An apparatus comprising: means for receiving a signal and pRoviding an output signal nonlinearly related to received signal strength, attenuating means having an input connected to said signal receiving means and a plurality of outputs, said attenuating means for attenuating said receiving means output signal different amounts at each of said outputs, a plurality of function taking circuits having a common output, each having an input connected to respective ones of said attenuating means outputs; and means individually connected to each of said function taking circuits for independently controlling the transfer characteristics of each of said circuits to compensate for the nonlinearly related receiving means output signal thereby providing a preselected function of said received signal at said common output regardless of received signal strength.
Claim 2
Independent Claim
125 words
An apparatus comprising: means for receiving a signal and pRoviding an output signal nonlinearly related to received signal strength, attenuating means having an input connected to said signal receiving means and a plurality of outputs, said attenuating means for attenuating said receiving means output signal different amounts at each of said outputs, a plurality of function taking circuits having a common output, each having an input connected to respective ones of said attenuating means outputs; and means individually connected to each of said function taking circuits for independently controlling the transfer characteristics of each of said circuits to compensate for the nonlinearly related receiving means output signal thereby providing a preselected function of said received signal at said common output regardless of received signal strength.
Claim 3
Independent Claim
125 words
An apparatus comprising: means for receiving a signal and pRoviding an output signal non-linearly related to received signal strength, attenuating means having an input connected to said signal receiving means and a plurality of outputs, said attenuating means for attenuating said receiving means output signal different amounts at each of said outputs, a plurality of function taking circuits having a common output, each having an input connected to respective ones of said attenuating means outputs; and means individually connected to each of said function taking circuits for independently controlling the transfer characteristics of each of said circuits to compensate for the nonlinearly related receiving means output signal thereby providing a preselected function of said received signal at said common output regardless of received signal strength.
Claim 4
Independent Claim
125 words
An apparatus comprising: means for receiving a signal and pRoviding an output signal non-linearly related to received signal strength, attenuating means having an input connected to said signal receiving means and a plurality of outputs, said attenuating means for attenuating said receiving means output signal different amounts at each of said outputs, a plurality of function taking circuits having a common output, each having an input connected to respective ones of said attenuating means outputs; and means individually connected to each of said function taking circuits for independently controlling the transfer characteristics of each of said circuits to compensate for the nonlinearly related receiving means output signal thereby providing a preselected function of said received signal at said common output regardless of received signal strength.
Claim 5
Dependent Claim
26 words
The apparatus of claim 1 wherein said attenuating means comprises: a plurality of resistors of preselected different values being series connected to said signal receiving means.
Claim 6
Dependent Claim
44 words
The apparatus of claim 1 wherein said function taking circuits comprise: a transistor having a control terminal connected to a respective one of said attenuating means outputs, an output terminal connected to said common output, and a third terminal connected to said last means.
Claim 7
Dependent Claim
40 words
The apparatus of claim 3 wherein said transistor is an NPN transistor in common emitter configuration such that said control terminal is the base terminal, said output terminal is the collector terminal, and said third terminal is the emitter terminal.
Claim 8
Dependent Claim
20 words
The apparatus of claim 3 wherein said last means comprises: means to control the output bias level of said transistor.
Claim 9
Dependent Claim
52 words
The apparatus of claim 5 wherein said signal receiving means include a detector for providing an output signal which is nonlinearly related to received signal strength and wherein said output bias level of said transistor is selected within the nonlinear range of said transistor to compensate for the nonlinearity of said detector.
Claim 10
Independent Claim
129 words
An apparatus comprising: means for receiving a signal and providing an output signal which is nonlinearly related to received signal strength, attenuating means having an input connected to said signal receiving means and a plurality of outputs, said attenuating means for attenuating the output signal therefrom in substantially logarithmically related amounts at each of said outputs, a plurality of function taking circuits having a common output, each having an input connected to respective ones of said attenuating means outputs; and means individually connected to each of said function taking circuits for independently controlling the transfer characteristics of each of said circuits to compensate for the nonlinearly related receiving means output signal thereby providing a logarithmic function of said received signal at said common output regardless of received signal strength.
Claim 11
Independent Claim
129 words
An apparatus comprising: means for receiving a signal and providing an output signal which is nonlinearly related to received signal strength, attenuating means having an input connected to said signal receiving means and a plurality of outputs, said attenuating means for attenuating the output signal therefrom in substantially logarithmically related amounts at each of said outputs, a plurality of function taking circuits having a common output, each having an input connected to respective ones of said attenuating means outputs; and means individually connected to each of said function taking circuits for independently controlling the transfer characteristics of each of said circuits to compensate for the nonlinearly related receiving means output signal thereby providing a logarithmic function of said received signal at said common output regardless of received signal strength.
Claim 12
Independent Claim
107 words
An apparatus for receiving signals comprising: an antenna for receiving a signal, a detector connected to said antenna for providing a voltage non-linearly related to said signal, attenuating means having an input connected to said detector and a plurality of outputs, said attenuating means for attenuating said output voltage different amounts at each of said outputs, a plurality of function taking circuits having a common output, each having an input connected to respective ones of said attenuating means outputs; and means individually connected to each of said function taking circuits for independently controlling the transfer characteristics of each of said circuits to compensate for the detector nonlinearity.
Claim 13
Independent Claim
107 words
An apparatus for receiving signals comprising: an antenna for receiving a signal, a detector connected to said antenna for providing a voltage non-linearly related to said signal, attenuating means having an input connected to said detector and a plurality of outputs, said attenuating means for attenuating said output voltage different amounts at each of said outputs, a plurality of function taking circuits having a common output, each having an input connected to respective ones of said attenuating means outputs; and means individually connected to each of said function taking circuits for independently controlling the transfer characteristics of each of said circuits to compensate for the detector nonlinearity.
Claim 14
Dependent Claim
124 words
The apparatus of claim 8 further including: a second antenna for receiving said signal, a second detector connected to said second antenna for providing a second voltage nonlinearly related to said signal, a second attenuating means having an input connected to said second detector and a plurality of outputs, said attenuating means for attenuating said output voltage different amounts at each of said outputs, a plurality of second function taking circuits having a second common output, each having an input connected to respective ones of said second attenuating means outputs; and second means individually connected to each of said second function taking circuits for independently controlling the transfer characteristics of each of said second function taking circuits to compensate for said second detector nonlinearity.
Claim 15
Dependent Claim
33 words
The apparatus of claim 9 including: further including: means connected to said common outputs for comparing the output signal therefrom and generating a signal representative of the difference of said common output signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |