Design and Analysis of an NMOS Operational Amplifier with Depletion Loads.
Abstract
The MOS transistor has become the building block for LSI digital circuits in recent years. Its small device size and high fabrication yield have made it particularly attractive. Recently, however, the application of MOS technology to analog circuits has been studied. One particularly useful analog circuit is the operational amplifier. The ability to fabricate an all MOS operational amplifier on an LSI chip can increase the flexibility of many signal processing tasks, such as filtering, D/A and A/D conversion. In addition, the amplifier would be compatible with other MOS circuit elements. In this thesis a single channel NMOS operational amplifier with depletion loads is designed. Computer simulation using the SPICE circuit analysis program is used as a design aid and to evaluate the final design, as this lends itself easily to the study of parameter variations within the circuit. Of particular interest is the method of internal frequency compensation of the amplifier leading to design criteria for several small signal parameters. These small signal parameters are directly related to device geometry and D.C. bias conditions. Other characteristics and performance criteria of the amplifier are also discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1979
- Accession Number
- ADA085313
Entities
People
- Richard Dean Davis
Organizations
- University of Illinois Urbana–Champaign