Patent US4751474A successfully refreshed from Google Patents.
US4751474A
Expired / Lapsed
US
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Broadband amplifier incorporating a circuit device effective to improve frequency response
Assignee: STMicroelectronics SRL
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Filing: 1986-12-22
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Granted: 1988-06-14
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Expires: 2006-12-22
Abstract
Abstract A broadband amplifier comprising insulated collector vertical pnp transistors, a circuit device effective to improve frequency response, and a final stage comprising a so-called complementary pair formed of an npn transistor and a pnp transistor having emitters connected to each other and to an epitaxial layer n of the insulated collector vertical pnp transistor incorporated in the gain circuit of said amplifiers. The complementary pair afford minimization of the junction parasitic capacitances of the aforesaid vertical pnp transistor.
Inventors
- 👤 Alberto Gola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:20
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/42; H03F1/48; H03F1/08; H03F1/14; H03F3/00; H03F3/30; H03F3/3069; H03F3/3076
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A broadband amplifier comprising; a differential amplifier; a gain circuit connected to said differential amplifier and including an insulated collector vertical PNP transistor having an n-epitaxial layer and having a terminal connected to said n-epitaxial layer, and with a final stage comprising a complementary pair formed by an NPN and a PNP transistor with interconnected emitters; and a low impedence output circuit connected to the gain circuit and comprising a circuit device comprising an additional complementary pair connected in parallel with the firstmentioned complementary pair and formed by an NPN and a PNP transistor with interconnected emitters which are connected to said terminal of the n-epitaxial layerof the vertical PNP transistor incorporated to the gain circuit, whereby the circuit device is effective to improve frequency response of the amplifier.
Claim 2
Dependent Claim
129 words
A broadband amplifier comprising; a differential amplifier; a gain circuit connected to said differential amplifier and including an insulated collector vertical PNP transistor having an n-epitaxial layer and having a terminal connected to said n-epitaxial layer, and with a final stage comprising a complementary pair formed by an NPN and a PNP transistor with interconnected emitters; and a low impedence output circuit connected to the gain circuit and comprising a circuit device comprising an additional complementary pair connected in parallel with the firstmentioned complementary pair and formed by an NPN and a PNP transistor with interconnected emitters which are connected to said terminal of the n-epitaxial layerof the vertical PNP transistor incorporated to the gain circuit, whereby the circuit device is effective to improve frequency response of the amplifier.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |