VLSI implementation of stray insensitive switched capacitor composite operational amplifiers
Silvernagel, Gregory A.
Fouts, Douglas J.
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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 finite design, limited bandwidth, lower slew rate, as well as enhancing the overall network passive and active sensitivities. The switched capacitor is implemented using both the toggle switched capacitor and the modified open floating resistor techniques. The composite operational amplifier is implemented using the C20A-1 and C20A-2 designs from the CNOA-i possibilities. These four designs are produced on a single microchip that includes the two phase nonoverlapping clock circuit and the switches. The microchip is tested in a finite gain circuit and the results are used to evaluate the performance of the design. Short comings in the circuit performance are identified and the analysis is used to improve network simulations as well as provide guidance for design improvements. The design improvements are incorporated in a second generation microchip that is fabricated in a low noise analog process.
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