US4703285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wideband amplifier with active high-frequency compensation
Assignee: Micron Technology Inc
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Filing: 1986-04-23
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Granted: 1987-10-27
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Expires: 2006-04-23
Abstract
Abstract A wideband amplifier with active high-frequency compensation includes an active equivalent RC network connected across the emitters of a differential amplifier. The active RC network exploits inherent junction capacitance and resistance, and is controlled in such a manner that the desired compensation value is provided.
Inventors
- 👤 James Woo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:13
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/42; H03F1/48; H03F1/08; H03F1/083
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
In a differential amplifier including a pair of input transistors having an impedance coupled between the emitters thereof, an active high-frequency compensation circuit, comprising: a pair of compensation transistors each having a base connected to an emitter of a respective input transistor, wherein the emitters of said compensation transistors are coupled together and the collectors of said compensation transistors are coupled together, said compensation transistors each having a predetermined base-to-collector capacitance; first control means for varying the conduction of said compensation transistors; and second control means for varying the collector-base voltage of said compensation transistors.
Claim 2
Dependent Claim
95 words
In a differential amplifier including a pair of input transistors having an impedance coupled between the emitters thereof, an active high-frequency compensation circuit, comprising: a pair of compensation transistors each having a base connected to an emitter of a respective input transistor, wherein the emitters of said compensation transistors are coupled together and the collectors of said compensation transistors are coupled together, said compensation transistors each having a predetermined base-to-collector capacitance; first control means for varying the conduction of said compensation transistors; and second control means for varying the collector-base voltage of said compensation transistors.
Claim 3
Dependent Claim
28 words
An active high-frequency compensation circuit in accordance with claim 1 wherein said first control means comprises variable current generator means connected to the emitters of said compensation transistors.
Claim 4
Dependent Claim
28 words
An active high-frequency compensation circuit in accordance with claim 2 further comprising a control circuit connected to said current generator means to establish the level of current generated.
Claim 5
Dependent Claim
28 words
An active high-frequency compensation circuit in accordance with claim 1 wherein said second control means comprises a variable voltage generator coupled to the collectors of said compensation transistors.
References Cited (Backward Citations)
US4390848A
Cited
US4575687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-26 | 1991-04-27 | 1991-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-26 | 1995-04-27 | 1995-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-26 | 1999-04-27 | 1999-10-27 | $7700.00 | Window Closed / Lapsed |