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This paper presents an optimization methodology for continuous time loop-filters design applied to Class-D amplifiers. The methodology is based on an evolutionary optimization approach which integrates both the topology selection and circuit sizing by automatically generating optimal sized topologies and performance tradeoffs for the Class-D amplifier. The presented approach is demonstrated for the...
We present the calculation of noise expressions of low voltage amplifiers by applying symbolic nodal analysis and using nullors. The nullor equivalents of the MOSFETs include only the dominant parasitic elements in order to generate a simplified symbolic noise expression, which provides a good insight to improve the design of low voltage amplifiers. The generated symbolic noise expressions are compared...
This article presents a 3rd order current-mode quadrature oscillator using current controlled current conveyor transconductance amplifiers (CCCCTAs) as active elements. The proposed circuit is realized from a non-inverting lossless integrator and an inverting second-order lowpass filter. The oscillation condition and oscillation frequency can be electronically/orthogonally controlled via input bias...
This article presents a new current-mode squarer based on MO-CCTA (multiple output current conveyor transconductance amplifier). The circuit description is very simple, its construction consists of merely 2 MO-CCTAs. Without external passive elements, the proposed circuit is then suitable for IC architecture. The PSPICE simulation and experimental results are depicted, and agree well with the theoretical...
This paper reviews an analog multiplier and divider using only single multiple-output current controlled current through transconductance amplifier (MO-CCCTTA). The proposed circuit can function as a four-quadrant multiplier and two quadrant divider without changing original circuit topology. A constant value of multiplication and division can be controlled via an input bias current and temperature-insensitive...
In this paper we present a bi-directional AutoZe-roing Amplifier(AZA). The direction of the circuit is controlled by swapping the VDD and GND resulting in swap of input and output. The amplifier can have similar or different properties in each directions. In addition to the gain, the amplifier offers frequency band adjustment allowing it to be used in designing bidirectional time-continuous circuits...
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