US5694083A
Expired / Lapsed
US
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Single end input high frequency amplifier
Assignee: Mitsubishi Electric Corp
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Filing: 1996-04-16
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Granted: 1997-12-02
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Expires: 2016-04-16
Abstract
Abstract A single end input type high frequency amplifier of the present invention decreases noise superposed on a power supply of a pre-amplifier in a read amplifier which amplifies a signal from MR head. The single end input type high frequency amplifier includes a transistor connected to an input side terminal of a differential input amplifier. A single end type resistor is connected to the transistor and a loop amplifier is connected to the single end type resistor to feedback a difference voltage between a reference side terminal and an input side terminal of the differential input amplifier.
Inventors
- 👤 Takehiko Umeyama
- 👤 Tsutomu Kamifuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:20
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/42; G; G11; G11B; G11B5/00; G11B5/02; H03F3/189; H03F3/19; H03F3/45; H03F3/45071; H03F3/45076; H03F3/4508; H03F2203/00; H03F2203/45; H03F2203/45394
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
140 words
A single end input high frequency amplifier comprising: a single end transistor having an emitter, a base, and a collector, the emitter being connected to an input terminal; a differential input amplifier having an input terminal coupled to the collector of said single end transistor, and a reference terminal; a loop amplifier having 1) an output terminal coupled to the base of said single end transistor, 2) a first input terminal connected to the reference terminal of said differential input amplifier, and 3) a second input terminal connected to the input terminal of said differential input amplifier; and a transistor having an emitter, a base, and a collector, the collector being connected to the reference terminal of said differential input amplifier, the emitter being connected to a first constant-voltage source, and the base being connected to a second constant-voltage source.
Claim 2
Dependent Claim
140 words
A single end input high frequency amplifier comprising: a single end transistor having an emitter, a base, and a collector, the emitter being connected to an input terminal; a differential input amplifier having an input terminal coupled to the collector of said single end transistor, and a reference terminal; a loop amplifier having 1) an output terminal coupled to the base of said single end transistor, 2) a first input terminal connected to the reference terminal of said differential input amplifier, and 3) a second input terminal connected to the input terminal of said differential input amplifier; and a transistor having an emitter, a base, and a collector, the collector being connected to the reference terminal of said differential input amplifier, the emitter being connected to a first constant-voltage source, and the base being connected to a second constant-voltage source.
Claim 3
Dependent Claim
178 words
A single end input high frequency amplifier comprising: a single end transistor having a base, a collector, and an emitter; a first transistor having 1) a collector connected to a power supply through a first resistor, 2) a base connected to a first constant-voltage source, and 3) an emitter connected to the collector of said single end transistor; a differential input amplifier; a loop amplifier for canceling noise applied to a power supply; and a second transistor having a collector connected to the power supply through a serial circuit of a second constant-voltage source and a second resistor, and having an emitter connected to a third constant-voltage source, and having a base connected to a fourth constant-voltage source, said differential input amplifier including an input terminal connected to the collector of said first transistor and a reference terminal connected to the collector of said second transistor, and said loop amplifier being connected to the base of said single end transistor to feedback a voltage difference between the reference terminal and the input terminal of said differential input amplifier.
Claim 4
Dependent Claim
178 words
A single end input high frequency amplifier comprising: a single end transistor having a base, a collector, and an emitter; a first transistor having 1) a collector connected to a power supply through a first resistor, 2) a base connected to a first constant-voltage source, and 3) an emitter connected to the collector of said single end transistor; a differential input amplifier; a loop amplifier for canceling noise applied to a power supply; and a second transistor having a collector connected to the power supply through a serial circuit of a second constant-voltage source and a second resistor, and having an emitter connected to a third constant-voltage source, and having a base connected to a fourth constant-voltage source, said differential input amplifier including an input terminal connected to the collector of said first transistor and a reference terminal connected to the collector of said second transistor, and said loop amplifier being connected to the base of said single end transistor to feedback a voltage difference between the reference terminal and the input terminal of said differential input amplifier.
Claim 5
Dependent Claim
176 words
A single end input high frequency amplifier comprising: a single end transistor having a base, a collector, and an emitter; a first transistor having 1) a collector connected to a power supply through a first resistor, 2) a base connected to a first constant-voltage source, and 3) an emitter connected to the collector of said single end transistor; a differential input amplifier; a loop amplifier for canceling noise applied to a power supply; and a second transistor having 1) a collector connected to the power supply through a serial circuit of at least second and third resistors, 2) a base connected to a constant-current source, and 3) an emitter connected to a second constant-voltage source, said differential input amplifier including an input terminal connected to the collector of said first transistor and a reference terminal connected to the collector of said second transistor, and said loop amplifier being connected to the base of said single end transistor to feed back a voltage difference between the reference terminal and the input terminal of said differential input amplifier.
Claim 6
Dependent Claim
176 words
A single end input high frequency amplifier comprising: a single end transistor having a base, a collector, and an emitter; a first transistor having 1) a collector connected to a power supply through a first resistor, 2) a base connected to a first constant-voltage source, and 3) an emitter connected to the collector of said single end transistor; a differential input amplifier; a loop amplifier for canceling noise applied to a power supply; and a second transistor having 1) a collector connected to the power supply through a serial circuit of at least second and third resistors, 2) a base connected to a constant-current source, and 3) an emitter connected to a second constant-voltage source, said differential input amplifier including an input terminal connected to the collector of said first transistor and a reference terminal connected to the collector of said second transistor, and said loop amplifier being connected to the base of said single end transistor to feed back a voltage difference between the reference terminal and the input terminal of said differential input amplifier.
Claim 7
Dependent Claim
20 words
The single end high frequency amplifier of claim 2 wherein resistances of said first and second resistors are the same.
Claim 8
Dependent Claim
22 words
The single end input high frequency amplifier of claim 3 wherein resistances of side first, second and third resistors are the same.
Claim 9
Dependent Claim
27 words
The single end input high frequency amplifier of claim 2 wherein said loop amplifier includes an output terminal and the output terminal is grounded through a capacitor.
Claim 10
Dependent Claim
27 words
The single end input high frequency amplifier of claim 3 wherein said loop amplifier includes an output terminal and the output terminal is grounded through a capacitor.
Claim 11
Dependent Claim
25 words
The single end input high frequency amplifier of claim 3 wherein a capacitor is connected in parallel across one of the second and third resistors.
Claim 12
Dependent Claim
42 words
The single end input high frequency amplifier of claim 1 wherein the input terminal of said differential input amplifier is coupled to the collector of said single end transistor through a second transistor having a base connected to a third constant-voltage source.
Claim 13
Dependent Claim
39 words
The single end input high frequency amplifier of claim 9 wherein said second transistor includes an emitter connected to the collector of said single end transistor and a collector connected to the input terminal of said differential input amplifier.
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) | 2000-12-01 | 2001-06-02 | 2001-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-01 | 2005-06-02 | 2005-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-01 | 2009-06-02 | 2009-12-02 | $7700.00 | Window Closed / Lapsed |