US5091663A
Expired / Lapsed
US
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Mesfet differential amplifier
Assignee: Toshiba Corp
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Filing: 1991-02-08
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Granted: 1992-02-25
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Expires: 2011-02-08
Abstract
Abstract A differential amplifier includes first and second normally off type MESFETs, which constitute a differential switching stage, sources of which are commonly connected to a current source, and gates of which are supplied with a signal input potential and a reference potential, respectively, third and fourth normally on type MESFETs connected at loads between the first MESFET and a voltage source and between the second MESFET and the voltage source, fifth and sixth normally off type MESFETs gates of which are connected to the drains of the first and second MESFETs, respectively, and drains of which are connected to the voltage source, and seventh and eighth MESFETs drains of which are connected to sources of the fifth and sixth MESFETs and output first and second output potentials and gates of which are applied with potentials having levels corresponding to the second and first output potentials, respectively.
Inventors
- 👤 Naoko Ishizaki
- 👤 Atsushi Kameyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:05
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03K; H03K3/00; H03K3/02; H03K3/353; H03K3/356; H03K3/356017; H03K3/356034
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
147 words
A differential amplifier comprising: first and second normally off type MOSFETs which constitute a differential switching stage, sources of which are commonly connected to a current source, and gates of which are applied with a signal input potential and a reference potential, respectively; third and fourth normally on type MESFETs connected as loads between said first MESFET and a voltage source and between said second MESFET and the voltage source, respectively; fifth and sixth normally off type MESFETs gates of which are connected to the drains of said first and second MESFETs, respectively, and drains of which are connected to the voltage source; and seventh and eight MESFETs drains of which are connected to sources of the fifth and sixth MESFETs and output first and second output potentials and gates of which are applied with potentials having levels corresponding to said second and first output potentials, respectively.
Claim 2
Dependent Claim
147 words
A differential amplifier comprising: first and second normally off type MOSFETs which constitute a differential switching stage, sources of which are commonly connected to a current source, and gates of which are applied with a signal input potential and a reference potential, respectively; third and fourth normally on type MESFETs connected as loads between said first MESFET and a voltage source and between said second MESFET and the voltage source, respectively; fifth and sixth normally off type MESFETs gates of which are connected to the drains of said first and second MESFETs, respectively, and drains of which are connected to the voltage source; and seventh and eight MESFETs drains of which are connected to sources of the fifth and sixth MESFETs and output first and second output potentials and gates of which are applied with potentials having levels corresponding to said second and first output potentials, respectively.
Claim 3
Dependent Claim
13 words
A differential amplifier according to claim 1, wherein said MESFETs consist of GaAs.
Claim 4
Dependent Claim
18 words
A differential amplifier according to claim 1, wherein said seventh and eighth MESFETs are normally off type MESFETS.
Claim 5
Dependent Claim
18 words
A differential amplifier according to claim 1, wherein said seventh and eighth MESFETs are normally on type MESFETs.
Claim 6
Dependent Claim
30 words
A differential amplifier according to claim 1, further comprising level shift elements connected between said fifth MESFET and said seventh MESFET and between said sixth MESFET and said eighth MESFET.
Claim 7
Dependent Claim
15 words
A differential amplifier according to claim 5, wherein said level shift elements consist of diodes.
Claim 8
Dependent Claim
13 words
A differential amplifier according to claim 6, wherein said diodes are Schottky diodes.
Claim 9
Dependent Claim
14 words
A differential amplifier according to claim 6, wherein said diodes are p-n junction diodes.
Claim 10
Dependent Claim
136 words
A differential amplifier comprising: first and second normally off type MESFETs which constitute a differential switching stage, sources of which are commonly connected to a current source, and gates of which are applied with a signal input potential and a reference potential, respectively; third and fourth normally on type MESFETs connected between said first MESFET and a voltage source and between said second MESFET and the voltage source as loads, respectively; fifth and sixth normally off type MESFETs gates of which are connected to the drains of said first and second MESFETs and drains of which are connected to the voltage source, respectively; and seventh and eighth MESFETs drains of which are connected to sources of said fifth and sixth MESFETs and gates of which are connected to the sources of said sixth and fifth MESFETs.
Claim 11
Dependent Claim
136 words
A differential amplifier comprising: first and second normally off type MESFETs which constitute a differential switching stage, sources of which are commonly connected to a current source, and gates of which are applied with a signal input potential and a reference potential, respectively; third and fourth normally on type MESFETs connected between said first MESFET and a voltage source and between said second MESFET and the voltage source as loads, respectively; fifth and sixth normally off type MESFETs gates of which are connected to the drains of said first and second MESFETs and drains of which are connected to the voltage source, respectively; and seventh and eighth MESFETs drains of which are connected to sources of said fifth and sixth MESFETs and gates of which are connected to the sources of said sixth and fifth MESFETs.
Claim 12
Dependent Claim
13 words
A differential amplifier according to claim 9, wherein said MESFETs consist of GaAs.
Claim 13
Dependent Claim
18 words
A differential amplifier according to claim 9, wherein said seventh and eighth MESFETs are normally off type MESFETs.
Claim 14
Dependent Claim
18 words
A differential amplifier according to claim 9, wherein said seventh and eighth MESFETs are normally on type MESFETs.
Claim 15
Dependent Claim
30 words
A differential amplifier according to claim 9, further comprising level shift elements connected between said fifth MESFET and said seventh MESFET and between said sixth MESFET and said eighth MESFET.
Claim 16
Dependent Claim
15 words
A differential amplifier according to claim 13, wherein said level shift elements consist of diodes.
Claim 17
Dependent Claim
13 words
A differential amplifier according to claim 14, wherein said diodes are Schottky diodes.
Claim 18
Dependent Claim
14 words
A differential amplifier according to claim 14, wherein said diodes are p-n junction diodes.
Claim 19
Dependent Claim
132 words
A differential amplifier comprising: first and second normally off type MESFETs which constitute a differential switching stage, sources of which are commonly connected to a current source, and gates of which are applied with a signal input potential and a reference potential, respectively; third and fourth MESFETs connected as loads between said first MESFET and a voltage source and between said second MESFET and the voltage source, respectively; fifth and sixth normally off type MESFETs gates of which are connected to the drains of said first and second MESFETs, respectively, and drains of which are connected to the voltage source; and seventh and eighth MESFETs drains of which are connected to sources of said fifth and sixth MESFETs and gates of which are connected to gates of said fourth and third MESFETs.
Claim 20
Dependent Claim
132 words
A differential amplifier comprising: first and second normally off type MESFETs which constitute a differential switching stage, sources of which are commonly connected to a current source, and gates of which are applied with a signal input potential and a reference potential, respectively; third and fourth MESFETs connected as loads between said first MESFET and a voltage source and between said second MESFET and the voltage source, respectively; fifth and sixth normally off type MESFETs gates of which are connected to the drains of said first and second MESFETs, respectively, and drains of which are connected to the voltage source; and seventh and eighth MESFETs drains of which are connected to sources of said fifth and sixth MESFETs and gates of which are connected to gates of said fourth and third MESFETs.
Claim 21
Dependent Claim
13 words
A differential amplifier according to claim 17, wherein said MESFETs consist of GaAs.
Claim 22
Dependent Claim
18 words
A differential amplifier according to claim 17, wherein said seventh and eighth MESFETs are normally off type MESFETs.
Claim 23
Dependent Claim
18 words
A differential amplifier according to claim 17, wherein said seventh and eighth MESFETs are normally on type MESFETs.
Claim 24
Dependent Claim
30 words
A differential amplifier according to claim 17, further comprising level shift elements connected between said fifth MESFET and said seventh MESFET and between said sixth MESFET and said eighth MESFET.
Claim 25
Dependent Claim
15 words
A differential amplifier according to claim 21, wherein said level shift elements consist of diodes.
Claim 26
Dependent Claim
13 words
A differential amplifier according to claim 22, wherein said diodes are Schottky diodes.
Claim 27
Dependent Claim
14 words
A differential amplifier according to claim 22, wherein said diodes are p-n junction diodes.
References Cited (Backward Citations)
JPS59162688A
Cited
US4656371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-02-24 | 1995-08-26 | 1996-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-24 | 1999-08-26 | 2000-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-24 | 2003-08-26 | 2004-02-25 | $7700.00 | Window Closed / Lapsed |