US3663888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
All-fet linear voltage difference amplifier
Assignee: Verizon Laboratories Inc
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Filing: 1970-02-16
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Granted: 1972-05-16
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Expires: 1990-02-16
Abstract
Abstract A linear voltage difference amplifier circuit which utilizes a plurality of field-effect devices having substantially identical operating characteristics. The devices are connected in a series arrangement with the source electrode of each device coupled to the drain electrode of its adjacent device. Each of the devices except a first and a second of the devices has its gate electrode coupled to its drain electrode. Input terminals are coupled to the gate electrodes of the first and second devices and an output terminal is coupled to the drain electrode of one of the devices. In one embodiment of the invention the amplifier consists of three devices and the output voltage is equal to the voltage applied to the first input terminal minus twice the voltage applied to the second input terminal.
Inventors
- 👤 Richard M Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:32
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/343; H03F3/345; G; G06; G06G; G06G7/00; G06G7/12; G06G7/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A voltage difference amplifier comprising: a. first, second and third field-effect devices having substantially identical operating characteristics, each of said devices having drain, source and gate electrodes, said devices being connected in a series arrangement with the source electrode of each device coupled to the drain electrode of the next device in the arrangement, said series arrangement having a source end and a drain end, the first device being at the source end of the series arrangement, the second device being at the drain end of the series arrangement and the third device having its gate electrode coupled to its drain electrode; b. first and second input terminals coupled to the gate electrodes of said first and second devices; c. means for applying a bias voltage between the drain and source ends of said series arrangement; and d. an output terminal coupled to the drain electrode of the first device.
Claim 2
Dependent Claim
150 words
A voltage difference amplifier comprising: a. first, second and third field-effect devices having substantially identical operating characteristics, each of said devices having drain, source and gate electrodes, said devices being connected in a series arrangement with the source electrode of each device coupled to the drain electrode of the next device in the arrangement, said series arrangement having a source end and a drain end, the first device being at the source end of the series arrangement, the second device being at the drain end of the series arrangement and the third device having its gate electrode coupled to its drain electrode; b. first and second input terminals coupled to the gate electrodes of said first and second devices; c. means for applying a bias voltage between the drain and source ends of said series arrangement; and d. an output terminal coupled to the drain electrode of the first device.
Claim 3
Dependent Claim
66 words
The voltage difference amplifier as defined by claim 1 further comprising means for applying first and second input voltages to said first and second input terminals, said input voltages being of sufficient magnitude such that said first and second devices operate in their saturation regions whereby the voltage at said output terminal is substantially equal to said second input voltage minus twice said first input voltage.
Claim 4
Dependent Claim
19 words
The voltage difference amplifier as defined by claim 2 wherein said field-effect devices are substantially identical MOS field transistors.
Claim 5
Dependent Claim
149 words
A voltage differenCe amplifier comprising: a. first, second and third field-effect devices having substantially identical operating characteristics, each of said devices having drain, source and gate electrodes, said devices being connected in a series arrangement with the source electrode of each device coupled to the drain electrode of the next device in the arrangement, said series arrangement having a source end and a drain end, the first device being in the middle of the series arrangement, said second device is at the drain end of said series arrangement, and the third device having its gate electrode coupled to its drain electrode; b. first and second input terminals coupled to the gate electrodes of said first and second devices; c. means for applying a bias voltage between the drain and source ends of said series arrangement; and d. an output terminal coupled to the drain electrode of the first device.
Claim 6
Dependent Claim
149 words
A voltage differenCe amplifier comprising: a. first, second and third field-effect devices having substantially identical operating characteristics, each of said devices having drain, source and gate electrodes, said devices being connected in a series arrangement with the source electrode of each device coupled to the drain electrode of the next device in the arrangement, said series arrangement having a source end and a drain end, the first device being in the middle of the series arrangement, said second device is at the drain end of said series arrangement, and the third device having its gate electrode coupled to its drain electrode; b. first and second input terminals coupled to the gate electrodes of said first and second devices; c. means for applying a bias voltage between the drain and source ends of said series arrangement; and d. an output terminal coupled to the drain electrode of the first device.
Claim 7
Dependent Claim
66 words
The voltage difference amplifier as defined by claim 4 further comprising means for applying first and second input voltages to said first and second input terminals, said input voltages being of sufficient magnitude such that said first and second devices operate in their saturation regions whereby the voltage at said output terminal is substantially equal to said second input voltage minus half said first input voltage.
Claim 8
Dependent Claim
20 words
The voltage difference amplifier as defined by claim 5 wherein said field-effect devices are substantially identical MOS field effect transistors.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |