Amplifier active load

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

330260, H03F 345

Patent

active

046299971

ABSTRACT:
The present invention is an improved active load which eliminates the current imbalance between the collectors of the emitter-coupled input transistors. The circuit includes a pair of first and second emitter-coupled transistors with their collectors coupled to a current source which supplies substantially equal currents to the collectors of the two transistors. The collector of one of the emitter-coupled transistors is coupled to the base of a third output transistor. A fourth transistor is coupled between the collector of the output transistor and the supply voltage. Finally, the circuit includes means for supplying the base current to the fourth transistor such that the base current of the fourth transistor and the third output transistor are substantially equal and the collector currents of the first and second emitter-coupled transistors remain substantially equal, resulting in negligible offset current and high open loop gain. Preferably, this is done by coupling the base of the fourth transistor to the collector of the first emitter-coupled transistor while the base of the output transistor is coupled to the collector of the second emitter-coupled transistor.

REFERENCES:
patent: 3916331 (1975-10-01), Schenck

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 active load 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 active load, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplifier active load will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-247033

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