US3900800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage amplifier
Assignee: Xerox Corp
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Filing: 1973-01-22
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Granted: 1975-08-19
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Expires: 1993-01-22
Abstract
Abstract A high speed, high voltage DC coupled linear amplifier includes a series string of transistor amplifying stages, means for biasing the junctions of each of the transistors substantially equal, means for enhancing the response speed of the amplifier and means for protecting the transistors. In another embodiment, an upper and a lower string of the aforementioned type of amplifiers are connected by means of a diode to operate the two strings in a push-pull fashion in response to an input signal.
Inventors
- 👤 Martin Sidney Maltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:56
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
241 words
A high speed, high voltage DC coupled amplifier comprising, an upper and lower string of amplifying stages, said upper string of amplifying stages connected in series with a bias circuit for said lower string of amplifying stages and said lower string of amplifying stages connected in series with a bias circuit for said upper string of amplifying stages, wherein each of said amplifying stages includes an active element having first, second and third electrodes, first diode means connecting the third electrode of the active element of the first stage of the upper string to the first electrode of the active element of the last stage of the lower string, said diode means being so poled that it conducts and drives the output in one direction and turns off the upper string when the lower string turns on and that it turns said upper string on which drives the output in the other direction when said lower string is turned off, thereby enabling the upper and lower strings to operate in a push-pull relationship, first impedance means coupled between adjacent amplifying stages for establishing substantially equal potential across the first and second electrodes of the adjacent stages, second impedance means coupled in shunt with said first impedance means for enhancing the response speed of the amplifier, and reverse voltage preventing means coupled across said second and third electrode of said active element for preventing an application of a large reverse potential thereto.
Claim 2
Dependent Claim
241 words
A high speed, high voltage DC coupled amplifier comprising, an upper and lower string of amplifying stages, said upper string of amplifying stages connected in series with a bias circuit for said lower string of amplifying stages and said lower string of amplifying stages connected in series with a bias circuit for said upper string of amplifying stages, wherein each of said amplifying stages includes an active element having first, second and third electrodes, first diode means connecting the third electrode of the active element of the first stage of the upper string to the first electrode of the active element of the last stage of the lower string, said diode means being so poled that it conducts and drives the output in one direction and turns off the upper string when the lower string turns on and that it turns said upper string on which drives the output in the other direction when said lower string is turned off, thereby enabling the upper and lower strings to operate in a push-pull relationship, first impedance means coupled between adjacent amplifying stages for establishing substantially equal potential across the first and second electrodes of the adjacent stages, second impedance means coupled in shunt with said first impedance means for enhancing the response speed of the amplifier, and reverse voltage preventing means coupled across said second and third electrode of said active element for preventing an application of a large reverse potential thereto.
Claim 3
Dependent Claim
83 words
The apparatus according to claim 1, wherein each active element is a transistor having collector, base and emitter electrodes as the first, second and third electrodes, said first impedance means includes first and second resistors of substantially same magnitude, said second impedance means includes first and second capacitive means in shunt with the first and second resistors respectively, and said reverse voltage preventing means includes a second diode means connected across the base and emitter electrodes of each active element in reverse polarity.
Claim 4
Dependent Claim
104 words
The apparatus according to claim 2, wherein each active element is an NPN transistor, and wherein the transistors of successive stages are connected in series in which the collector electrode of the preceding stage is connected to the emitter electrode of the succeeding stage, and, in the intermediate stages, said first resistive means is connected between the emitter electrode of the preceding stage and the base electrode of the succeeding stage, and, in between the input stage and the first intermediate stage, said first resistive means is connected between the base electrodes of the transistor of the input stage and the first intermediate stage.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |