Theory and implementation of a VLSI stray insensitive switched capacitor composite operational amplifier
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In this research, improved analog circuits are implemented using VLSI technology by combining the properties of switched capacitors and composite amplifiers. This combined design solves some of the problems of the single operational amplifier (OA) such as finite dc gain, limited bandwidth and lower slew rate, as well as enhancing the overall network passive and active sensitivities. For the first time, a theoretical analysis was conducted in a newly-defined discrete transform domain. The analysis was used to justify the circuits that were first designed in the continuous domain and also debug the initial attempts that were made to build an analog chip. The switched capacitor design is implemented using both the toggle switched inverter and the modified open floating resistor techniques. The composite OA is implemented using the C20A-1 design out of all the CNOA-i possibilities. The two alternatives, together with two single CMOS OAs that were added for comparison reasons, are produced on a single analog/digital microchip. The digital part includes the two-phase non-overlapping clock and programmable switches. It is isolated from the analog part using a low-noise design technique. Sufficient simulations were made to anticipate results in positive and negative finite gain configurations, and also to evaluate the two different techniques. Finally, neural networks applications of the chip are suggested evoking thoughts for the advantages of this promising technique.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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Silvernagel, Gregory A. (Monterey, California. Naval Postgraduate School, 1993-12);In this research, analog active circuits are implemented in VLSI technology by combining the properties of switched capacitors and composite amplifiers. This combined design improves upon the single operational amplifier's ...
Bingham, Eldon Wade (Monterey, California: Naval Postgraduate School, 1993-03);In this research, analog active circuits are designed combining the properties of switched capacitors and composite operational amplifiers. This combined design improves upon the single operational amplifier's finite dc ...
Raisor, Ralph C. (Monterey, California. Naval Postgraduate School, 1991-06);In this research, analog active circuits are analyzed and designed using periodic sampling techniques. Switched capacitor networks are the basis of these techniques. A parasitic free switched capacitor network is combined ...