US3733525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rf microwave amplifier and carrier
Assignee: Collins Radio Co
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Filing: 1972-03-20
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Granted: 1973-05-15
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Expires: 1992-03-20
Abstract
Abstract A power transistor and carrier advantageous for RF power (e.g. microwave) amplifier applications with improved linearity in class AB operation. The carrier comprises a channel-shaped member having a centrally located transistor mounting platform between two parallel rail members. One rail member includes a recessed plated portion for receiving base electrode wire bonds, and the other rail member includes a recessed portion including plating which is integrally contiguous with plating on the bottom surface of the carrier, whereby a resistive member may be mounted thereon with electrical contact to the bottom surface. The resistive member is low ohmage with high current capacity and is interconnected with the transistor emitter thereby insuring linear transistor operation by maintaining base-emitter junction forward bias, yet minimizes gain loss attendant with an emitter resistor.
Inventors
- 👤 E Robinson
- 👤 R Shipley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:37
CPC Classifications
H; H10; H10D; H10D1/00; H10D1/40; H10D1/43; H10W; H10W44/00; H10W44/20; H10W44/226; H10W70/00; H10W70/60; H10W70/67; H10W70/68; H10W70/682; H10W72/00; H10W72/071; H10W72/075; H10W72/50; H10W72/531; H10W72/533; H10W72/534; H10W72/541; H10W72/547; H10W72/5475; H10W72/851; H10W72/874; H10W72/884; H10W72/90; H10W72/931; H10W72/932; H10W90/00; H10W90/701; H10W90/751; H10W90/754
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
214 words
In combination, an RF power amplifier and mounting carrier comprising a transistor, a low ohmage high current capacity resistor, a channel shaped member, said channel shaped member having a centrally located mounting platform between two parallel rail members, each of said two parallel rail members having a recessed portion, said transistor being mounted on said platform with the collector of said transistor in contact therewith, conductor means interconnecting the base of said transistor with said recessed portion of one of said rail members, said resistor mounted on said recessed portion of the other of said rail members, conductor means interconnecting the emitter of said transistor to said resistor, a bottom conductive layer on the major surface of said channel shaped member opposite said platform, a conductive layer on said platform for contact with said collector, a conductive layer on said recessed portion of said one rail member for receiving said base interconnecting conductor means, a conductive layer on said recessed portion of said other rail member for receiving said resistor and contiguous with said bottom conductive layer, and said recessed portions defining pedestals on each of said rail members which provide protection for said conductor means and which receive the conductive layer of each respective recessed portion to facilitate electrical test of said combination.
Claim 2
Dependent Claim
214 words
In combination, an RF power amplifier and mounting carrier comprising a transistor, a low ohmage high current capacity resistor, a channel shaped member, said channel shaped member having a centrally located mounting platform between two parallel rail members, each of said two parallel rail members having a recessed portion, said transistor being mounted on said platform with the collector of said transistor in contact therewith, conductor means interconnecting the base of said transistor with said recessed portion of one of said rail members, said resistor mounted on said recessed portion of the other of said rail members, conductor means interconnecting the emitter of said transistor to said resistor, a bottom conductive layer on the major surface of said channel shaped member opposite said platform, a conductive layer on said platform for contact with said collector, a conductive layer on said recessed portion of said one rail member for receiving said base interconnecting conductor means, a conductive layer on said recessed portion of said other rail member for receiving said resistor and contiguous with said bottom conductive layer, and said recessed portions defining pedestals on each of said rail members which provide protection for said conductor means and which receive the conductive layer of each respective recessed portion to facilitate electrical test of said combination.
Claim 3
Dependent Claim
32 words
The combination as defined by claim 1 wherein said resistor comprises a doped semiconductor member with a plurality of heavily doped regions on one major face with provide contacts to said resistor.
Claim 4
Dependent Claim
115 words
An RF power transistor carrier and circuit mount comprising an insulative channel shaped member, said channel shaped member having a centrally located mounting platform between two parallel rail members, each of said two parallel rail members having a recessed portion lying between two pedestals, a conductive metal layer on said platform for receiving a transitor, a bottom conductive metal layer of the major surface of said member opposite said platform, a conductive metal layer on one of said rail members including said recessed portion and said two pedestals, and a conductive metal layer on the other of said rail members including said recessed portion and said two pedestals and contiguous with said bottom conductive layer.
Claim 5
Dependent Claim
115 words
An RF power transistor carrier and circuit mount comprising an insulative channel shaped member, said channel shaped member having a centrally located mounting platform between two parallel rail members, each of said two parallel rail members having a recessed portion lying between two pedestals, a conductive metal layer on said platform for receiving a transitor, a bottom conductive metal layer of the major surface of said member opposite said platform, a conductive metal layer on one of said rail members including said recessed portion and said two pedestals, and a conductive metal layer on the other of said rail members including said recessed portion and said two pedestals and contiguous with said bottom conductive layer.
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |