Amplifier circuit and power supply provided therewith

Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C330S257000

Reexamination Certificate

active

06850118

ABSTRACT:
An amplifier circuit includes first and second resistors that are serially connected to each other between bases of first and second transistors that flow the same current as that in a differential transistor pair made up of two transistors. A capacitor is provided between a junction of the first and second resistors and the collector of the first transistor on the output side. The amplifier circuit has a gain whose frequency characteristic is determined by a low-pass filter realized by the second resistor and capacitor connected to the second transistor. The frequency characteristic lowers a gain of the frequency that causes output oscillation, thereby preventing output oscillation. The two resistors divide a resistance between the bases of the sub transistors, so as to reduce a resistance of the second resistor. As a result, the effect of phase compensation becomes weaker and the load response characteristic of the power supply improves. This enables the DC regulated power supply, even if it is of an intermediate current type which produces an output current of about 500 mA, to prevent output oscillation without reducing the load response characteristic, even when a chip-stacked ceramic capacitor is used as the output capacitor.

REFERENCES:
patent: 5859757 (1999-01-01), Hanafusa et al.
patent: 6559626 (2003-05-01), Horie
patent: 6717467 (2004-04-01), Renous et al.
Kazuo Watanabe, “Designing of Practical Analog Electronic Circuits”, Sougou-Denshi Shuppansha, Jun. 22, 1996, pp. 109-112.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Amplifier circuit and power supply provided therewith does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Amplifier circuit and power supply provided therewith, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplifier circuit and power supply provided therewith will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3492764

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.