Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1999-01-28
2000-04-11
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330253, H03F 345
Patent
active
060492538
ABSTRACT:
Both the distortion characteristic and the through rate characteristic of an operational amplifier are excellently retained over a wide range of a supply voltage. While an operating current of a differential circuit is controlled by a first current source circuit, an operating current of a level shift circuit is controlled by a second current source circuit. The first current source circuit controls the operating current to be substantially constant against a change of the supply voltage, so that the through rate characteristic of the operational amplifier can be good over a predetermined range of the supply voltage. The second current source circuit controls the operating current so that a difference between the supply voltage and a level shift voltage can be substantially constant against the change of the supply voltage so as not to degrade the distortion characteristic of the operational amplifier over the predetermined range of the supply voltage. As a result, the distortion characteristic and the through rate characteristic of the operational amplifier can be excellently retained over a wide range of the supply voltage.
REFERENCES:
patent: 4668919 (1987-05-01), De Weck
patent: 5289058 (1994-02-01), Okamoto
patent: 5650753 (1997-07-01), Ling
patent: 5841317 (1998-11-01), Ohmori et al.
patent: 5898341 (1999-04-01), Miyashita
patent: 5909146 (1999-06-01), Okada
Matsushita Electric - Industrial Co., Ltd.
Nguyen Khanh Van
Pascal Robert
Robinson Eric J.
LandOfFree
Operational amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Operational amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Operational amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1179809