Title :
Criteria and methods for the selection of optimized capacitor values in SC-filters
Author :
Goette, Josef ; Kaelin, August ; Guggenbühl, Walter
Author_Institution :
Swiss Fed. Inst. of Technol., Zurich, Switzerland
Abstract :
A hierarchical SC (switched-capacitor) filter design methodology that obtains minimal spread in combination with either minimal sensitivity or minimal noise is discussed. The noise measure and the sensitivity measure are defined by an analytic formula that uses only capacitors, ideal switches, and ideal amplifiers. An efficient capacitor assignment optimization is applied on this high level of abstraction. The noise measure is interpreted as a characteristic point on a lower abstraction level that also takes into account the technological parameters of amplifier noise, amplifier transconductances, switch noise, and switch conductances. The given interpretation allows a further refinement of a design by choosing optimally adapted amplifier transconductances and switch conductances
Keywords :
optimisation; sensitivity analysis; switched capacitor filters; SC-filters; amplifier noise; amplifier transconductances; capacitor assignment optimization; capacitors; hierarchical SC filter design; high level of abstraction; ideal amplifiers; ideal switches; minimal noise; minimal sensitivity; minimal spread; noise measure; optimally adapted amplifier transconductances; optimized capacitor values; sensitivity measure; switch conductances; switch noise; switched capacitor filters; technological parameters; Circuit noise; Filters; Low-noise amplifiers; MOS capacitors; Noise level; Noise measurement; Optimization methods; Signal to noise ratio; Switches; Tellurium;
Conference_Titel :
Circuits and Systems, 1989., IEEE International Symposium on
Conference_Location :
Portland, OR
DOI :
10.1109/ISCAS.1989.100691
