US4254380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bridge amplifier
Assignee: Motorola Solutions Inc
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Filing: 1979-07-02
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Granted: 1981-03-03
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Expires: 1999-07-02
Abstract
Abstract A circuit for converting an asymmetrical input signal applied to a single ended input terminal of the circuit to a symmetrical output voltage appearing across balanced differential outputs. The circuit includes first and second operational amplifiers, the outputs of which are the outputs of the circuit. The noninverting inputs of the two amplifiers being coupled to a reference voltage. The inverting input of the first amplifier being adapted to receive the input signal and further being coupled through a first resistor to the output thereof. The inverting input of the second amplifier being coupled both to the output thereof and the output of the first amplifier through respective second and third resistors.
Inventors
- 👤 Michel Y. Guillien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:00
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3081
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
144 words
A bridge amplifier, comprising: first and second operational amplifiers, each having an inverting input, a noninverting input and an output, the noninverting input of each one of said first and second operational amplifier being coupled to a terminal at which is supplied a direct current reference voltage said respective outputs being the outputs of the bridge amplifier; first circuit means for coupling the inverting input of said first operational amplifier to an input of the bridge amplifier; first resistive means for coupling the inverting input of said first operational amplifier to the output thereof; and second resistive means for coupling the inverting input of said second operational amplifier both to the output thereof and to said output of said first operational amplifier, said noninverting inputs of said first and second operational amplifiers being direct current isolated from said inverting inputs and said outputs thereof.
Claim 2
Dependent Claim
144 words
A bridge amplifier, comprising: first and second operational amplifiers, each having an inverting input, a noninverting input and an output, the noninverting input of each one of said first and second operational amplifier being coupled to a terminal at which is supplied a direct current reference voltage said respective outputs being the outputs of the bridge amplifier; first circuit means for coupling the inverting input of said first operational amplifier to an input of the bridge amplifier; first resistive means for coupling the inverting input of said first operational amplifier to the output thereof; and second resistive means for coupling the inverting input of said second operational amplifier both to the output thereof and to said output of said first operational amplifier, said noninverting inputs of said first and second operational amplifiers being direct current isolated from said inverting inputs and said outputs thereof.
Claim 3
Dependent Claim
19 words
The bridge amplifier of claim 1 wherein said first resistive means is a first resistor having a first value.
Claim 4
Dependent Claim
61 words
The bridge amplifier of claim 2 wherein said second resistive means includes: a second resistor having a second value being connected between said inverting input of said second operational amplifier and the output thereof; and a third resistor having a third value being connected between said inverting input of said second operational amplifier and said output of said first operational amplifier.
Claim 5
Dependent Claim
19 words
The bridge amplifier of claim 3 wherein said values of said second and third resistors are equal in magnitude.
Claim 6
Dependent Claim
51 words
The bridge amplifier of claim 4 including: a fourth resistor connecting said noninverting input of said first operational amplifier to said terminal at which is supplied a reference voltage; and a fifth resistor connecting said noninverting input of said second amplifier to said terminal at which is supplied a reference voltage.
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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |