US4853609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distortion-free, opposite-phase current source
Assignee: Pioneer Corp
•
Filing: 1983-06-09
•
Granted: 1989-08-01
•
Expires: 2003-06-09
Abstract
Abstract An opposite-phase current source is improved by eliminating the conventionally employed current mirror circuits, and by instead using a pair of transistor current sources subjected to voltage feedback and emitter-connected via a resistor. A constant current source or sources are coupled to the opposite ends of the resistor or to a mid-point thereof.
Inventors
- 👤 Tatsuo Numata
- 👤 Tadashi Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:57
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
An opposite-phase current source, having no current mirror circuits therein, comprising; two current sources, each of said sources comprising a transistor having an emitter, base and collector; a voltage feedback circuit for each of said current sources, each said feedback circuit comprising a loop between said emitter and said base of each of said transistors; a resistor element connected between said emitters of the transistors of said two current sources; constant current source means coupled to said resistor element, said constant current source means comprising a pair of constant current sources, each serially connected to a respective one of said emitters, and coupled on opposite sides of said resistor element; whereby two opposite-phase currents are produced at said collectors of said transistors when an input signal is applied to one of said bases of said transistors.
Claim 2
Dependent Claim
136 words
An opposite-phase current source, having no current mirror circuits therein, comprising; two current sources, each of said sources comprising a transistor having an emitter, base and collector; a voltage feedback circuit for each of said current sources, each said feedback circuit comprising a loop between said emitter and said base of each of said transistors; a resistor element connected between said emitters of the transistors of said two current sources; constant current source means coupled to said resistor element, said constant current source means comprising a pair of constant current sources, each serially connected to a respective one of said emitters, and coupled on opposite sides of said resistor element; whereby two opposite-phase currents are produced at said collectors of said transistors when an input signal is applied to one of said bases of said transistors.
Claim 3
Dependent Claim
116 words
An opposite-phase current source, having no current mirror circuits therein, comprising; two current sources, each of said sources being subjected to voltage feedback and comprising a transistor having an emitter, base and collector; a resistor element connected between said emitters of the transistors of said two current sources; constant current source means coupled to said resistor element; whereby two opposite-phase currents are produced at said collectors of said transistor when an input signal is applied to one of said bases of said transistors; and wherein said constant current source means comprises a pair of constant current sources, each serially connected to a respective one of said emitters, and coupled on opposite sides of said resistor element.
Claim 4
Dependent Claim
116 words
An opposite-phase current source, having no current mirror circuits therein, comprising; two current sources, each of said sources being subjected to voltage feedback and comprising a transistor having an emitter, base and collector; a resistor element connected between said emitters of the transistors of said two current sources; constant current source means coupled to said resistor element; whereby two opposite-phase currents are produced at said collectors of said transistor when an input signal is applied to one of said bases of said transistors; and wherein said constant current source means comprises a pair of constant current sources, each serially connected to a respective one of said emitters, and coupled on opposite sides of said resistor element.
Claim 5
Dependent Claim
21 words
A device as claimed in claim 2, wherein the transistors of said constant current sources are coupled at the bases thereof.
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) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |