Patent US1097987A successfully refreshed from Google Patents.
Patent US3919660A successfully refreshed from Google Patents.
US3919660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifiers with impedance-matched inputs and outputs
Assignee: BP Corp North America Inc
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Filing: 1971-12-06
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Granted: 1975-11-11
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Expires: 1991-12-06
Abstract
Abstract A variety of amplifiers are described, each of which comprises two active stages having equal coefficients of transmission, and mutually inverse input and output terminal impedances whose respective magnitudes are at least an order of magnitude different than that of the external circuits connected thereto. Input and output transformer networks couple the two stages to a common signal source and to a common output load.
Inventors
- 👤 Henry Richard Beurrier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:33
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H03; H03F; H03F1/00; H03F1/32; H03F1/3223; H03F1/38; H03F1/56; H03F1/565; H03F3/00; H03F3/20; H03F3/21; H03F3/211; H03F3/68; H03H; H03H11/00; H03H11/02; H03H11/36; H04; H04B; H04B3/00; H04B3/02; H04B3/36; H03F2200/00; H03F2200/198; H03F2200/537
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
215 words
An amplifier for coupling a signal source to a load comprising: an input autotransformer and an output autotransformer; a first tap along said input autotransformer for dividing said input transformer into two unequal portions; said first tap constituting the input port of said amplifier; a second tap along said output autotransformer for dividing said output transformer into two unequal portions; said second tap constituting the output port of said amplifier; a pair of active stages, each of which is connected between a different end of said input transformer and a different end of said output transformer; one of said stages having an input impedance that is at least an order of magnitude greater than the net source impedance connected thereto, and the other of said stages having an input impedance that is at least an order of magnitude less than the net source impedance connected thereto; one of said stages having an output impedance that is at least an order of magnitude greater than the net load impedance connected thereto, and the other of said stages having an output impedance that is at least an order of magnitude less than the net load impedance connected thereto; an input and output matching impedances connected across at least a portion of said input and output autotransformers, respectively.
Claim 2
Dependent Claim
215 words
An amplifier for coupling a signal source to a load comprising: an input autotransformer and an output autotransformer; a first tap along said input autotransformer for dividing said input transformer into two unequal portions; said first tap constituting the input port of said amplifier; a second tap along said output autotransformer for dividing said output transformer into two unequal portions; said second tap constituting the output port of said amplifier; a pair of active stages, each of which is connected between a different end of said input transformer and a different end of said output transformer; one of said stages having an input impedance that is at least an order of magnitude greater than the net source impedance connected thereto, and the other of said stages having an input impedance that is at least an order of magnitude less than the net source impedance connected thereto; one of said stages having an output impedance that is at least an order of magnitude greater than the net load impedance connected thereto, and the other of said stages having an output impedance that is at least an order of magnitude less than the net load impedance connected thereto; an input and output matching impedances connected across at least a portion of said input and output autotransformers, respectively.
Claim 3
Dependent Claim
28 words
The amplifier according to claim 1 wherein the input and output impedances of said active stages are related to said source and to said load impedance Zo by
Claim 4
Dependent Claim
208 words
An amplifier for coupling a signal source to a load comprising: a 1:M turns ratio input transformer and a 1:M turns ratio output transformer; means for coupling said signal source across one winding of said input transformer; means for coupling said load across one winding of said output transformer; a pair of active stages, each of which is connected between a different end of the other winding of said input transformer and a different end of the other winding of said output transformer; one of said stages having an input impedance that is at least an order of magnitude greater than the net source impedance connected thereto, and the other of said stages having an input impedance that is at least an order of magnitude less than the net source impedance connected thereto; one of said stages having an output impedance that is at least an order of magnitude greater than the net load impedance connected thereto, and the other of said stages having an output impedance that is at least an order of magnitude less than the net load impedance connected thereto; and an input and an output matching impedance connected, respectively, to a tap along the other winding of each of said input and output transformers.
Claim 5
Dependent Claim
208 words
An amplifier for coupling a signal source to a load comprising: a 1:M turns ratio input transformer and a 1:M turns ratio output transformer; means for coupling said signal source across one winding of said input transformer; means for coupling said load across one winding of said output transformer; a pair of active stages, each of which is connected between a different end of the other winding of said input transformer and a different end of the other winding of said output transformer; one of said stages having an input impedance that is at least an order of magnitude greater than the net source impedance connected thereto, and the other of said stages having an input impedance that is at least an order of magnitude less than the net source impedance connected thereto; one of said stages having an output impedance that is at least an order of magnitude greater than the net load impedance connected thereto, and the other of said stages having an output impedance that is at least an order of magnitude less than the net load impedance connected thereto; and an input and an output matching impedance connected, respectively, to a tap along the other winding of each of said input and output transformers.
Claim 6
Dependent Claim
28 words
The amplifier according to claim 3 wherein the input and output impedances of said active stages are related to the source and to the load impedances Zo by
Claim 7
Dependent Claim
211 words
An amplifier for coupling a signal source to a load comprising: an input autotransformer; an output autotransformer; and a pair of active stages; one of said stages having an input impedance that is at least an order of magnitude greater than the net source impedance connected thereto, and the other of said stages having an input impedance that is at least an order of magnitude less than the net source impedance connected thereto; one of said stages having an output impedance that is at least an order of magnitude greater than the net load impedance connected thereto, and the other of said stages having an output impedance that is at least an order of magnitude less than the net load impedance connected thereto; the higher input impedance stage being connected to one end of said input transformer; the lower input impedance stage being connected to a tap along said input transformer; the higher output impedance stage being connected to one end of said output transformer; the lower output impedance stage being connected to a tap along said output transformer; the other ends of said transformers constituting the input terminal and the output terminal of said amplifier; and input and output matching impedances connected to a second tap along said respective transformers.
Claim 8
Dependent Claim
211 words
An amplifier for coupling a signal source to a load comprising: an input autotransformer; an output autotransformer; and a pair of active stages; one of said stages having an input impedance that is at least an order of magnitude greater than the net source impedance connected thereto, and the other of said stages having an input impedance that is at least an order of magnitude less than the net source impedance connected thereto; one of said stages having an output impedance that is at least an order of magnitude greater than the net load impedance connected thereto, and the other of said stages having an output impedance that is at least an order of magnitude less than the net load impedance connected thereto; the higher input impedance stage being connected to one end of said input transformer; the lower input impedance stage being connected to a tap along said input transformer; the higher output impedance stage being connected to one end of said output transformer; the lower output impedance stage being connected to a tap along said output transformer; the other ends of said transformers constituting the input terminal and the output terminal of said amplifier; and input and output matching impedances connected to a second tap along said respective transformers.
Claim 9
Dependent Claim
22 words
The amplifier according to claim 5 wherein said matching impedances are connected to a point along said transformers between said active stages.
Claim 10
Dependent Claim
26 words
The amplifier according to claim 6 wherein said taps divide said transformers into three portions of n1, n2 and n3 turns, respectively, and where n2/n1 n3/n2.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |