Patent US5841317A successfully refreshed from Google Patents.
US5841317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential amplifier circuit with a high through put rate and reduced power consumption
Assignee: Panasonic Holdings Corp
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Filing: 1996-02-26
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Granted: 1998-11-24
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Expires: 2016-02-26
Abstract
Abstract A differential amplifier achieving a high throughput rate with reduced power consumption includes a differential circuit, output circuit, a constant current source transistor, a drive transistor, and a switching circuit. A difference voltage relative to a difference between voltages applied to non-inverting and inverting inputs of the differential circuit is applied to the switching circuit. The switching circuit supplies a drive signal to the drive transistor to enable the drive transistor when the difference voltage is below a predetermined threshold voltage, and to disable the drive transistor when the difference voltage is above the predetermined threshold voltage.
Inventors
- 👤 Tetsurou Ohmori
- 👤 Yoshito Date
- 👤 Takashi Koizumi
- 👤 Yoshio Imamura
- 👤 Osamu Sarai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:43
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F1/00; H03F1/02; H03F1/0205; H03F1/0277; H03F3/30; H03F3/3001; H03F2203/00; H03F2203/30; H03F2203/30057
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
140 words
A differential amplifier comprising: a differential circuit, comprising a non-inverting input and an inverting input, for outputting a difference voltage relative to a difference between a first voltage applied to the non-inverting input and a second voltage applied to the inverting input; an output circuit comprising a constant current supply transistor for supplying a constant current, and a control transistor controlled by said difference voltage, and a junction between said supply transistor and said control transistor; a drive transistor connected to said junction for supplying current in a same direction as said constant current supply transistor; and a switching circuit for supplying a drive signal to said drive transistor to enable said drive transistor when said difference voltage is below a predetermined threshold voltage, and to disable said drive transistor when said difference voltage is above said predetermined threshold voltage.
Claim 2
Dependent Claim
140 words
A differential amplifier comprising: a differential circuit, comprising a non-inverting input and an inverting input, for outputting a difference voltage relative to a difference between a first voltage applied to the non-inverting input and a second voltage applied to the inverting input; an output circuit comprising a constant current supply transistor for supplying a constant current, and a control transistor controlled by said difference voltage, and a junction between said supply transistor and said control transistor; a drive transistor connected to said junction for supplying current in a same direction as said constant current supply transistor; and a switching circuit for supplying a drive signal to said drive transistor to enable said drive transistor when said difference voltage is below a predetermined threshold voltage, and to disable said drive transistor when said difference voltage is above said predetermined threshold voltage.
Claim 3
Dependent Claim
42 words
A differential amplifier according to claim 1, wherein said predetermined threshold voltage is set to a value less than the difference voltage obtained when absolute values of the currents flowing through said constant current supply transistor and said control transistor are equal.
Claim 4
Dependent Claim
32 words
A differential amplifier according to claim 1, wherein said predetermined threshold voltage is set to a value less than the difference voltage obtained when current begins to flow through the control transistor.
Claim 5
Dependent Claim
165 words
A differential amplifier according to claim 1, wherein said differential circuit comprises: a first p-channel MOS transistor having a constant bias voltage applied to the gate thereof; second and third p-channel MOS transistors, the sources of said second and third p-channel MOS transistors being connected to the drain of said first p-channel MOS transistor, the gate of said second p-channel MOS transistor being connected to said non-inverting input and the gate of said third p-channel MOS transistor being connected to said inverting input, and first and second n-channel MOS transistors, the drain of said first n-channel MOS transistor being connected to the drain of said second p-channel MOS transistor and the drain of said second n-channel MOS transistor being connected to the drain of said third p-channel MOS transistor the gates of said first and second n-channel MOS transistors being connected in common and to one of the drains thereof, and the sources of said first and second n-channel MOS transistors being connected in common.
Claim 6
Dependent Claim
70 words
A differential amplifier according to claim 4, wherein said constant current supply transistor is a fourth p-channel MOS transistor having said constant bias voltage applied to the gate thereof; the control transistor is a third n-channel MOS transistor, having said difference voltage applied to the gate thereof; and the drive transistor is a fifth p-channel MOS transistor, having said drive signal from said switching circuit applied to the gate thereof.
Claim 7
Dependent Claim
24 words
A differential amplifier according to claim 5, wherein said switching circuit comprises a first inverter circuit and a second inverter circuit connected in series.
Claim 8
Dependent Claim
93 words
A differential amplifier according to claim 6, wherein said first inverter circuit comprises a sixth p-channel MOS transistor, to the gate of which is applied said difference voltage, and a fourth n-channel MOS transistor, to the gate of which is also applied said difference voltage, and wherein said second inverter circuit comprises a seventh p-channel MOS transistor, to the gate of which is applied an output voltage of the first inverter circuit, and a fifth n-channel MOS transistor, to the gate of which is applied the output voltage of the first inverter circuit.
Claim 9
Dependent Claim
89 words
A differential amplifier according to claim 6, wherein said first inverter circuit comprises a sixth p-channel MOS transistor, the gate of which is grounded, and a fourth n-channel MOS transistor, to the gate of which is applied said difference voltage, and wherein said second inverter circuit comprises a seventh p-channel MOS transistor, to the gate of which is applied an output voltage of the first inverter circuit, and a fifth n-channel MOS transistor, to the gate of which is also applied the output voltage of the first inverter circuit.
Claim 10
Dependent Claim
47 words
A differential amplifier according to claim 7, wherein said switching circuit further comprises: an eighth p-channel MOS transistor connected to a current path for supplying current to said sixth p-channel MOS transistor; and a sixth n-channel MOS transistor connected in parallel to said fourth n-channel MOS transistor.
Claim 11
Dependent Claim
47 words
A differential amplifier according to claim 8, wherein said switching circuit further comprises: an eighth p-channel MOS transistor connected to a current path for supplying current to said sixth p-channel MOS transistor; and a sixth n-channel MOS transistor connected in parallel to said fourth n-channel MOS transistor.
Claim 12
Dependent Claim
140 words
A differential amplifier comprising: a differential circuit, comprising a non-inverting input and an inverting input, for outputting a difference voltage relative to a difference between a first voltage applied to the non-inverting input and a second voltage applied to the inverting input; an output circuit comprising a constant current supply transistor for supplying a constant current, and a control transistor controlled by said difference voltage, and a junction between said supply transistor and said control transistor; a drive transistor connected to said junction for supplying current in a same direction as said constant current supply transistor; and a switching circuit for supplying a drive signal to said drive transistor to enable said drive transistor when said difference voltage is above a predetermined threshold voltage, and to disable said drive transistor when said difference voltage is below said predetermined threshold voltage.
Claim 13
Dependent Claim
140 words
A differential amplifier comprising: a differential circuit, comprising a non-inverting input and an inverting input, for outputting a difference voltage relative to a difference between a first voltage applied to the non-inverting input and a second voltage applied to the inverting input; an output circuit comprising a constant current supply transistor for supplying a constant current, and a control transistor controlled by said difference voltage, and a junction between said supply transistor and said control transistor; a drive transistor connected to said junction for supplying current in a same direction as said constant current supply transistor; and a switching circuit for supplying a drive signal to said drive transistor to enable said drive transistor when said difference voltage is above a predetermined threshold voltage, and to disable said drive transistor when said difference voltage is below said predetermined threshold voltage.
Claim 14
Dependent Claim
42 words
A differential amplifier according to claim 11, wherein said predetermined threshold voltage is set to a value greater than the difference voltage obtained when absolute values of the currents flowing through said constant current supply transistor and said control transistor are equal.
Claim 15
Dependent Claim
32 words
A differential amplifier according to claim 11, wherein said predetermined threshold voltage is set to a value greater than the difference voltage obtained when current begins to flow through the control transistor.
Claim 16
Dependent Claim
165 words
A differential amplifier according to claim 11, wherein said differential circuit comprises: a first n-channel MOS transistor having a constant bias voltage applied to the gate thereof; second and third n-channel MOS transistors, the sources of said second and third n-channel MOS transistors being connected to the drain of said first n-channel MOS transistor, the gate of said second n-channel MOS transistor being connected to said non-inverting input and the gate of said third n-channel MOS transistor being connected to said inverting input, and first and second p-channel MOS transistors, the drain of said first p-channel MOS transistor being connected to the drain of said second n-channel MOS transistor and the drain of said second p-channel MOS transistor being connected to the drain of said third n-channel MOS transistor, the gates of said first and second p-channel MOS transistors being connected in common and to one of the drains thereof, and the sources of said first and second p-channel MOS transistors being connected in common.
Claim 17
Dependent Claim
70 words
A differential amplifier according to claim 14, wherein said constant current supply transistor is a fourth n-channel MOS transistor, having said constant bias voltage applied to the gate thereof; the control transistor is a third p-channel MOS transistor, having said difference voltage applied to the gate thereof; and the drive transistor is a fifth n-channel MOS transistor, having said drive signal from said switching circuit applied to the gate thereof.
Claim 18
Dependent Claim
24 words
A differential amplifier according to claim 15, wherein said switching circuit comprises a first inverter circuit and a second inverter circuit connected in series.
Claim 19
Dependent Claim
93 words
A differential amplifier according to claim 16, wherein said first inverter circuit comprises a sixth n-channel MOS transistor, to the gate of which is applied said difference voltage, and a fourth p-channel MOS transistor, to the gate of which is also applied said difference voltage, and wherein said second inverter circuit comprises a seventh n-channel MOS transistor, to the gate of which is applied an output voltage of the first inverter circuit, and a fifth p-channel MOS transistor, to the gate of which is applied the output voltage of the first inverter circuit.
Claim 20
Dependent Claim
93 words
A differential amplifier according to claim 16, wherein said first inverter circuit comprises a sixth n-channel MOS transistor, the gate of which is provided with a constant voltage, and a fourth p-channel MOS transistor, to the gate of which is applied said difference voltage, and wherein said second inverter circuit comprises a seventh n-channel MOS transistor, to the gate of which is applied an output voltage of the first inverter circuit, and a fifth p-channel MOS transistor, to the gate of which is also applied the output voltage of the first inverter circuit.
Claim 21
Dependent Claim
47 words
A differential amplifier according to claim 17, wherein said switching circuit further comprises: an eighth n-channel MOS transistor connected to a current path for supplying current to said sixth n-channel MOS transistor; and a sixth p-channel MOS transistor connected in parallel to said fourth p-channel MOS transistor.
Claim 22
Dependent Claim
47 words
A differential amplifier according to claim 18, wherein said switching circuit further comprises: an eighth n-channel MOS transistor connected to a current path for supplying current to said sixth n-channel MOS transistor; and a sixth p-channel MOS transistor connected to parallel to said fourth p-channel MOS transistor.
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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) | 2001-11-23 | 2002-05-25 | 2002-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-23 | 2006-05-25 | 2006-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-23 | 2010-05-25 | 2010-11-24 | $7700.00 | Window Closed / Lapsed |