Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-05-09
2006-05-09
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S253000
Reexamination Certificate
active
07042290
ABSTRACT:
An output stage circuit is configured for enabling an output of an amplifier circuit to be pulled upwards and/or downwards to or beyond an upper power supply or below a lower power supply. The exemplary output stage circuit comprises a pair of output transistors configured to provide an output voltage, and a controlled resistive circuit. The controlled resistive element is configured to enhance the gain of the output stage circuit by modifying the dynamic impedance effect of the upper output transistor during pull-up operation, or the lower output transistor during pull-down operation. During normal operation, the controlled resistive element operates with low resistance, e.g., acts as a “short,” but during the pull-up or pull-down operation the controlled resistive element can be configured to add resistance to modify the dynamic impedance of the upper or lower output transistor. As a result, an amplifier circuit including an exemplary output stage circuit can swing towards or beyond an upper and/or lower power supply with minimal gain loss for the amplifier circuit, thus allowing for low voltage processes to be utilized.
REFERENCES:
patent: 3631357 (1971-12-01), Hadley
patent: 4241313 (1980-12-01), Takehara
patent: 4987381 (1991-01-01), Butler
patent: 6316999 (2001-11-01), Kato
Burt Rodney T.
Zhang Joy Y.
Brady W. James
Choe Henry
Swayze, Jr. W. Daniel
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
LandOfFree
Output stage circuit for an 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 Output stage circuit for an operational amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Output stage circuit for an operational amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3637994