Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1999-02-25
1999-11-02
Nguyen, Matthew
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
G05F 156
Patent
active
059777591
ABSTRACT:
A current mirror circuit comprises first and second resistors for conducting first and second reference currents dependent upon a supply voltage, and first and second current mirrors coupled to the first and second resistors, the second resistor being in series with a voltage reference. The second current mirror mirrors the second reference current, and its mirrored current output is subtracted from the first reference current, the difference current being mirrored by the first current mirror to produce a controlled output current. The circuit can be arranged so that the controlled output current is independent of changes of the supply voltage, or, optionally with further current mirrors and voltage references, so that the controlled output current has a desired relationship with the supply voltage. A circuit is described for a cellular telephone transmitter power amplifier for which the controlled current decreases with increasing supply voltage in a working range, and decreases more rapidly beyond this range for over-voltage protection.
REFERENCES:
patent: 3875430 (1975-04-01), Prak
patent: 4019121 (1977-04-01), Feindt
patent: 4325017 (1982-04-01), Schade, Jr.
patent: 4330744 (1982-05-01), Embree et al.
patent: 4399399 (1983-08-01), Joseph
patent: 4591780 (1986-05-01), Yamada et al.
patent: 5038053 (1991-08-01), Djenguerian et al.
patent: 5173656 (1992-12-01), Seevinck et al.
patent: 5446397 (1995-08-01), Yotsuyanagi
patent: 5498952 (1996-03-01), Ryat
patent: 5539302 (1996-07-01), Takimoto et al.
patent: 5570008 (1996-10-01), Goetz
patent: 5670868 (1997-09-01), Moriguchi et al.
patent: 5793194 (1998-08-01), Lewis
patent: 5838149 (1998-11-01), Perraud
patent: 5847556 (1998-12-01), Kothandaraman et al.
patent: 5864228 (1999-01-01), Brown et al.
patent: 5889665 (1999-03-01), Han
Haley R. John
Nguyen Matthew
Nortel Networks Corporation
LandOfFree
Current mirror circuits for variable supply voltages does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Current mirror circuits for variable supply voltages, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current mirror circuits for variable supply voltages will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2140146