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DTIC ADA283536: Theory and Implementation of a VLSI Stray Insensitive Switched Capacitor Composite Operational Amplifier

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. S

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