US4377789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operational amplifier employing complementary field-effect transistors
Assignee: Intersil Corp
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Filing: 1981-03-20
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Granted: 1983-03-22
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Expires: 2001-03-20
Abstract
Abstract An operational amplifier employing complementary MOSFET transistors includes first and second differential amplifiers respectively employing complementary conductivity type transistors. The input connections of the first and second differential amplifiers connect in parallel to receive the same input signal, the common-mode voltage of which may vary to and include first and second supply potentials. First and second current mirror amplifiers, respectively employing complementary conductivity type transistors, have input connections to which first and second output connections of the first differential amplifier respectively connect, and have output connections connected to an output terminal. Third and fourth current mirror amplifiers, respectively employing complementary conductivity type transistors, have input connections to which first and second output connections of the second differential amplifier respectively connect, and have output connections connected to the output terminal.
Inventors
- 👤 Merle V. Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:41
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03F3/45179; H03F3/4521; H03F3/30; H03F3/3001; H03G; H03G1/00; H03G1/0005; H03G1/0017; H03G1/0029; H03F2203/00; H03F2203/30; H03F2203/30015; H03F2203/45; H03F2203/45626
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
193 words
An operational amplifier circuit comprising: first and second input terminals and an output terminal; first and second supply terminals for receiving operating potential; first and second differential amplifying means of first and second complementary conductivity types, respectively, each having first and second input connections to which said first and second input terminals respectively connect, and each having first and second output connections; first and second current mirror amplifying means of said second and first conductivity types, respectively, each having an output connection to which said output terminal connects, each having a respective common connection to which said first and second supply terminals respectively connect, and each having a respective input connection to which the second and first output connections of said first differential amplifying means respectively connect; and third and fourth current mirror amplifying means of said first and second conductivity types, respectively, each having an output connection to which said output terminal connects, each having a respective common connection to which said second and first supply terminals respectively connect, and each having a respective input connection to which the second and first output connections of said second differential amplifying means respectively connect.
Claim 2
Dependent Claim
193 words
An operational amplifier circuit comprising: first and second input terminals and an output terminal; first and second supply terminals for receiving operating potential; first and second differential amplifying means of first and second complementary conductivity types, respectively, each having first and second input connections to which said first and second input terminals respectively connect, and each having first and second output connections; first and second current mirror amplifying means of said second and first conductivity types, respectively, each having an output connection to which said output terminal connects, each having a respective common connection to which said first and second supply terminals respectively connect, and each having a respective input connection to which the second and first output connections of said first differential amplifying means respectively connect; and third and fourth current mirror amplifying means of said first and second conductivity types, respectively, each having an output connection to which said output terminal connects, each having a respective common connection to which said second and first supply terminals respectively connect, and each having a respective input connection to which the second and first output connections of said second differential amplifying means respectively connect.
Claim 3
Dependent Claim
118 words
The amplifier circuit of claim 1 wherein said first differential amplifying means comprises: first and second transistors of said first conductivity type, having respective input electrodes serving as the first and second input connections of said first differential amplifying means, having respective output electrodes, the output electrode of said second transistor serving as the second output connection of said first differential amplifying means, and having respective common electrodes connected together for receiving a first operating current; means for applying said first operating current; and current amplifying means having an input connection to with the output electrode of said first transistor connects, and having an output connection serving as the first output connection of said first differential amplifying means.
Claim 4
Dependent Claim
102 words
The amplifier circuit of claim 2 wherein said current amplifying means comprises: third and fourth transistors of said second conductivity type each having an input electrode, each having a common electrode connected to said first supply terminal, said third transistor having an output electrode serving as the input connection of said current amplifying means and said fourth transistor having an output electrode serving as the output connection thereof; and means for applying a potential responsive to potential at the input connection of said current amplifying means to the respective input electrodes of said third and fourth transistors to condition them for conduction.
Claim 5
Dependent Claim
122 words
The amplifier circuit of claim 2 wherein said second differential amplifying means comprises: first and second further transistors of said second conductivity type, having respective input electrodes serving as the first and second input connections of said second differential amplifying means, having respective output electrodes, the output electrode of said second further transistor serving as the second output connection of said second differential amplifying means, and having respective common electrodes connected together for receiving a second operating current; means for applying said second operating current; and further current amplifying means having an input connection to which the output electrode of said first further transistor connects, and having an output connection serving as the first output connection of said second differential amplifying means.
Claim 6
Dependent Claim
98 words
The amplifier circuit of claim 4 wherein said means for applying said first operating current includes first current supply means connected between the connection of the common electrodes of said first and second transistors and said second supply terminal for supplying said first operating current responsive to a first control signal; and wherein said means for applying said second operating current includes second current supply means connected between the connection of the common electrodes of said first and second further transistors and said first supply terminal for supplying said second operating current responsive to a second control signal.
Claim 7
Dependent Claim
29 words
The amplifier circuit of claim 5 further including means for generating said first and second control signals to maintain a proportional relationship between said first and second operating currents.
Claim 8
Dependent Claim
78 words
The amplifying circuit of claim 5 wherein said first current supply means includes fifth current mirror amplifying means, having a first output circuit for supplying the first operating current, and having an input circuit to which the first control signal is applied; and said second current supply means includes sixth current mirror amplifying means having a first output circuit for supplying the second operating current and having an input circuit to which the second control signal is applied.
Claim 9
Dependent Claim
36 words
The amplifying circuit of claim 7 further including means connected between the respective input circuits of said fifth and sixth current mirror amplifying means for generating the first and second control signals by conducting current therebetween.
Claim 10
Dependent Claim
53 words
The amplifying circuit of claim 7 wherein one of said fifth and sixth current mirror amplifying means includes a further output circuit which connects to the input circuit of the other of said fifth and sixth current mirror amplifying means for applying the corresponding one of the first and second control signals thereto.
Claim 11
Dependent Claim
29 words
The amplifying circuit of claim 5 further including means for generating the first and second control signals to maintain a complementary relationship between the first and second operating currents.
Claim 12
Dependent Claim
128 words
The amplifying circuit of claim 10 wherein: said first current supply means includes a first control transistor of said first conductivity type having an output electrode connected for supplying said first operating current, having a common electrode connected to said second supply terminal, and having an input electrode; said second current supply means includes a second control transistor of said second conductivity type having an output electrode connected for supplying said second operating current, having a common electrode connected to said first supply terminal, and having an input electrode; and said means for generating the first and second control signals includes a control node for receiving a control potential thereat, and means connecting the respective input electrodes of said first and second control transistors to said control node.
Claim 13
Dependent Claim
55 words
The amplifying circuit of claim 11 wherein said control potential includes a fixed potential component and a variable potential component, said fixed potential component tending to maintain the first and second operating currents at a quiescent level, and said variable potential component tending to vary said first and second operating currents in said complementary relationship.
Claim 14
Dependent Claim
137 words
The amplifying circuit of claim 1 wherein each of said first, second, third and fourth current mirror amplifying means respectively comprises: first and second transistors of the same conductivity type as the particular current mirror amplifying means with which they are associated, each having a common electrode connected to the common connection thereof, each having an input and an output electrode, the output electrode of said first transistor serving as the input connection of said particular current mirror amplifying means; means for coupling the output electrode of said second transistor to the output connection of said particular current mirror amplifying means; and means for applying a potential responsive to potential at the input connection of said particular current mirror amplifying means to the respective input electrodes of said first and second transistors to condition them for conduction.
Claim 15
Dependent Claim
91 words
The amplifier circuit of claim 13 wherein said means for coupling and said means for applying together include: a third transistor of said same conductivity type, having an input electrode connected to the input connection of said particular current mirror amplifying means and having an output electrode connected to the output connection thereof, and having a common electrode connected to the output electrode of said second transistor; and means for applying the potential at the common electrode of said third transistor to the input electrodes of said first and second transistors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-21 | 1986-09-20 | 1987-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-21 | 1990-09-20 | 1991-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-21 | 1994-09-20 | 1995-03-22 | $7700.00 | Window Closed / Lapsed |