Patent US3216585A successfully refreshed from Google Patents.
Patent US4823094A successfully refreshed from Google Patents.
US4823094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-band high-fidelity amplifier
Assignee: Individual
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Filing: 1988-02-29
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Granted: 1989-04-18
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Expires: 2008-02-29
Abstract
Abstract The disclosed amplifier comprises a high-frequency power output stage for current amplification of the high-frequency signals and a separate low-frequency power output stage for current amplification of the low-frequency signals. Reactive coupling means, including either inductors or a capacitor or both, together with resistors, coact with the two output stages to provide a novel crossover circuit to transmit high-frequency signal to the amplifier output terminal and low-frequency signals to the inputs of the low-frequency output stage to drive the latter. Each output stage is disclosed as having its own power supply. Each output stage may thus be implemented with devices optimized for its respective frequency range, intermodulation distortion is substantially reduced, and similar benefits accrue in the design of the separate power supplies.
Inventors
- 👤 Martin G. Reiffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:56
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3069; H03F3/3076; H03F3/3001; H03F3/3008; H03F2200/00; H03F2200/516
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
99 words
A two-way high fidelity amplifiers for the reproduction of music without audible distortion and comprising a single-ended push-pull high-frequency output stage, a single-ended push-pull low-frequency output stage, a drive stage for transmitting both high-frequency and low-frequency signals to said high-frequency output stage, an output terminal for connection to a loudspeaker system, reactive coupling means for transmitting high-frequency signals from the high-frequency output stage to the output terminal and for transmitting low-frequency signals from the high-frequency output stage to the low-frequency output stage, and direct-current coupling means for transmitting low-frequency signals from the low-frequency output stage to the output terminal.
Claim 2
Dependent Claim
99 words
A two-way high fidelity amplifiers for the reproduction of music without audible distortion and comprising a single-ended push-pull high-frequency output stage, a single-ended push-pull low-frequency output stage, a drive stage for transmitting both high-frequency and low-frequency signals to said high-frequency output stage, an output terminal for connection to a loudspeaker system, reactive coupling means for transmitting high-frequency signals from the high-frequency output stage to the output terminal and for transmitting low-frequency signals from the high-frequency output stage to the low-frequency output stage, and direct-current coupling means for transmitting low-frequency signals from the low-frequency output stage to the output terminal.
Claim 3
Dependent Claim
26 words
An amplifier as recited in claim 1 wherein said reactive coupling means comprises capacitive coupling means extending from said high-frequency output stage to said output terminal.
Claim 4
Dependent Claim
42 words
An amplifier as recited in claim 1 wherein said reactive coupling means comprises inductive coupling means extending from said high-frequency output stage to said low-frequency output stage and further comprises resistive means extending from said high-frequency output stage to said output terminal.
Claim 5
Dependent Claim
41 words
An amplifier as recited in claim 1 wherein said reactive coupling means comprises capacitive coupling means extending from said high-frequency output stage to the output terminal, and inductive coupling means extending from said high-frequency output stage to said low-frequency output stage.
Claim 6
Dependent Claim
173 words
A two-way high fidelity amplifier for the reproduction of music without audible distortion and comprising a single-ended push-pull high-frequency output stage including a pair of transistors each having an input terminal and an output terminal, a single-ended push-pull low-frequency output stage including a pair of transistors each having an input terminal and an output terminal, a drive stage for transmitting both high-frequency and low-frequency signals to the input terminals of said high-frequency output stage, an amplifier output terminal for connection to a loudspeaker system, first impedance means extending from the output terminals of said high-frequency output stage to the amplifier output terminal for transmitting high-frequency output signals to said loudspeaker system, second impedance means extending from the output terminals of said high-frequency output stage to the input terminals of said low-frequency output stage for transmitting low-frequency drive signals to said low-frequency output stage to drive the latter, and means direct-current coupling the output terminals of said low-frequency output stage to the amplifier output terminal for transmitting low-frequency output signals to said loudspeaker system.
Claim 7
Dependent Claim
173 words
A two-way high fidelity amplifier for the reproduction of music without audible distortion and comprising a single-ended push-pull high-frequency output stage including a pair of transistors each having an input terminal and an output terminal, a single-ended push-pull low-frequency output stage including a pair of transistors each having an input terminal and an output terminal, a drive stage for transmitting both high-frequency and low-frequency signals to the input terminals of said high-frequency output stage, an amplifier output terminal for connection to a loudspeaker system, first impedance means extending from the output terminals of said high-frequency output stage to the amplifier output terminal for transmitting high-frequency output signals to said loudspeaker system, second impedance means extending from the output terminals of said high-frequency output stage to the input terminals of said low-frequency output stage for transmitting low-frequency drive signals to said low-frequency output stage to drive the latter, and means direct-current coupling the output terminals of said low-frequency output stage to the amplifier output terminal for transmitting low-frequency output signals to said loudspeaker system.
Claim 8
Dependent Claim
31 words
An amplifier as recited in claim 5 wherein said first impedance means comprises capacitive coupling means extending from the output terminals of said high-frequency output stage to said amplifier output terminal.
Claim 9
Dependent Claim
35 words
An amplifier as recited in claim 5 wherein said second impedance means comprises inductive coupling means extending from the output terminals of said high-frequency output stage to the input terminals of said low-frequency output stage.
Claim 10
Dependent Claim
54 words
An amplifier as recited in claim 5 wherein said two impedance means comprise capacitive coupling means extending from the output terminals of said high-frequency output stage to the amplifier output terminal, and inductive coupling means extending from the output terminals of said high-frequency output stage to the input terminals of said low-frequency output stage.
Claim 11
Dependent Claim
145 words
A dual-band high fidelity amplifier for the reproduction of music without audible distortion and comprising a single-ended push-pull high-frequency output stage including a complementary pair of field-effect transistors each having a gate and a source, a single-ended push-pull low-frequency output stage including a pair of bipolar transistors each having a base and an emitter, a drive stage for transmitting both high-frequency and low-frequency signals to each gate of said high-frequency output stage, an amplifier output terminal for connection to a loudspeaker system, reactive coupling means for transmitting high-frequency signals from each source of said high-frequency output stage to the amplifier output terminal and for transmitting low-frequency signals from each source of said high-frequency output stage to a respective base of said low-frequency output stage, and direct-current coupling means for transmitting low-frequency signals from each emitter of sid low-frequency output stage to the amplifier output terminal.
Claim 12
Dependent Claim
145 words
A dual-band high fidelity amplifier for the reproduction of music without audible distortion and comprising a single-ended push-pull high-frequency output stage including a complementary pair of field-effect transistors each having a gate and a source, a single-ended push-pull low-frequency output stage including a pair of bipolar transistors each having a base and an emitter, a drive stage for transmitting both high-frequency and low-frequency signals to each gate of said high-frequency output stage, an amplifier output terminal for connection to a loudspeaker system, reactive coupling means for transmitting high-frequency signals from each source of said high-frequency output stage to the amplifier output terminal and for transmitting low-frequency signals from each source of said high-frequency output stage to a respective base of said low-frequency output stage, and direct-current coupling means for transmitting low-frequency signals from each emitter of sid low-frequency output stage to the amplifier output terminal.
Claim 13
Dependent Claim
30 words
An amplifier as recited in claim 9 wherein said reactive coupling means comprises capacitive coupling means extending from each source of said high-frequency output stage to said amplifier output terminal.
Claim 14
Dependent Claim
47 words
An amplifier as recited in claim 9 wherein said reactive coupling means comprises inductive coupling means extending from each source of said high-frequency output stage to a respective base of said low-frequency output stage and further comprises resistive means extending from each source to said output terminal.
Claim 15
Dependent Claim
52 words
An amplifier as recited in claim 9 wherein said reactive coupling means comprises capacitive coupling means extending from each source of said high-frequency output stage to the amplifier output terminal, and inductive coupling means extending from each source of said high-frequency output stage to a respective base of said low-frequency output stage.
Claim 16
Dependent Claim
75 words
An amplifier as recited in claim 9 wherein said reactive coupling means comprises first impedance means extending from each source of said high-frequency output stage to the amplifier output terminal for transmitting high-frequency output signals to said loudspeaker system, and second impedance means extending from each source of said high-frequency output stage to a respective base of said low-frequency output stage for transmitting low-frequency drive signals to said low-frequency output stage to drive the latter.
Claim 17
Dependent Claim
15 words
An amplifier as recited in claim 13 wherein said first impedance means comprises a capacitor.
Claim 18
Dependent Claim
15 words
An amplifier as recited in claim 13 wherein said second impedance means comprises an inductor.
Claim 19
Dependent Claim
23 words
An amplifier as recited in claim 13 wherein said first impedance means comprises a capacitor, and said second impedance means comprises an inductor.
Claim 20
Dependent Claim
81 words
An amplifier as recited in claim 9 and comprising a complementary-symmetry push-pull common-emitter input stage including a pair of transistors each having a collector, a complementary-symmetry push-pull common-emitter drive stage including a pair of transistors each having a base and a collector, means direct-current-coupling each of said input stage transistor collectors to a respective one of said drive stage transistor bases, and means direct-current-coupling each of said drive stage transistor collectors to a respective one of said high-frequency output stage transistors.
Claim 21
Dependent Claim
52 words
An amplifier as recited in claim 17 wherein each of said input stage transistors has an emitter, a power suply having positive and negative terminals, and a pair of current sources each extending from a respective one of said power supply terminals to a respective one of said input stage transistor emitters.
References Cited (Backward Citations)
US3725727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |