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A Drive of Input and Output Impedance Effects of Functional Blocks into a Frequency Shift of Active Circuits
Kazuyuki WADA Nobuo FUJII Shigetaka TAKAGI
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1995/02/25
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Computer Aided Design)
compensation, active RC filter, automatic filter synthesis, filter tuning,
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A method of driving the effects caused by finite input impedance and nonzero output impedance of functional building blocks into a frequency shift of transfer characteristics is proposed. The method is quite simple and systematic. The input and output impedances can have arbitrary values under a simple condition which meets the monolithic integration of circuits. The effects of non ideal input and output impedances are converted to a change of integrator gain leading to a simple frequency shift of circuits. The frequency shift can easily be adjusted by conventional methods. A typical example shows a remarkable effect of the method.