Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1991-07-09
1992-11-24
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330273, H23F 330
Patent
active
051666367
ABSTRACT:
A Class A amplifier has a balanced input circuit including first and second input transistors to receive inverting and non-inverting inputs and to provide an output signal on the collector of the first input transistor. First and second load transistors are associated with the input transistors, the bases of the load transistors being connected to the collector of the second input transistor. An output circuit has source and sink output NPN transistors connected to receive the output signal from the first input transistor, and a circuit is provided for dynamically biasing at least one sink output transistor to have a minimum biasing current in a quiescent state, and increased biasing current in a current sink state. The circuit for dynamically biasing the output transistors has a pair of bias NPN transistors with their collector-emitter paths connected in series, and with the base of one connected to receive the output of the first input transistor. The base of the other bias transistors is connected to the emitter of the one bias transistor and to the base of the sink output transistor. The first and second bias transistors are sized to balance the load seen by the first and second input transistors.
REFERENCES:
patent: 4442409 (1984-04-01), Preslar
Bachand Richard A.
Jorgenson Lisa K.
Mullins James B.
Robinson Richard K.
SGS-Thomson Microelectronics Inc.
LandOfFree
Dynamic biasing for class A 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 Dynamic biasing for class A amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic biasing for class A amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-924690