3 edition of High-swing class-AB CMOS operational amplifier found in the catalog.
Typescript (photocopy).Thesis (M.S.)--Oregon State University, 1988.Bibliography: leaf 35.
|The Physical Object|
|Pagination||xvi, 64 p. :|
|Number of Pages||47|
nodata File Size: 8MB.
Transistors 33 and 34 act as a current mirror in the balanced differential amplifier. Therefore, a differential stage with a low CMR can be used. The drain of the output driver device is directly fed back to the non-inverting input of the differential amplifier to form a non-inverting unity gain amplifier. The prior art Class B output stage can drive large output voltage swings, however, it is subject to crossover distortion and uncontrollable DC bias current in the output driver devices.
The negative input of the differential amplifier is connected to the output of the input stage and the positive input is connected to the drain of transistor 36. In the exemplary embodiment of the invention, the power amplifier is used in an inverting unity gain configuration.
Control of DC bias current in the output driver devices is provided and maximum power conversion efficiency for the load is obtained for large output voltage swings. National Semiconductor Corp Original Assignee National Semiconductor Corp Priority date The priority date is an assumption and is not a legal conclusion. Output stage 21, shown in FIG.
In this way, the power amplifier is shut down and the power dissipation during non-operation is eliminated. The amplifier of claim 10, provided in a monolithic CMOS circuit. Amplifier 40, a differential amplifier, and devices 37, 38 and 44 comprise the input stage of the power amplifier. 238000005516 engineering process Methods 0.
The entire amplifier schematic is shown in the figure below. The drain of the output driver device is directly fed back to the non-inverting input of the differential stage to form a non-inverting unity gain amplifier.
Transistors 31-35 are the functional elements that make up a differential amplifier whose output becomes the input to transistor 36. To provide good AC stability, the phase shift at FU should be typically less than or equal to 120 degrees, 90 degrees of which comes from a dominant pole and 30 degrees of which comes from a secondary pole, in a two-pole system.
The amplifier consists of a high-gain input stage and a push-pull unity-gain amplifier high-swing class-AB CMOS operational amplifier stage.
It should be appreciated that the present invention may be provided in various embodiments.