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Journal ArticleDOI

Gain-sensitivity product-a figure of merit for hybrid-integrated filters using single operational amplifiers

George S. Moschytz
- 01 Jun 1971 - 
- Vol. 6, Iss: 3, pp 103-110
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TLDR
Q-stability measurements of hybrid- integrated positive feedback, or Sallen-Key-type circuits, which were realized with tantalum thin-film resistors and capacitors combined with beam-leaded operational amplifier chips agree very accurately with the predictions derived from gain-sensitivity calculations.
Abstract
It is shown that a different measure of performance must be used to evaluate hybrid-integrated active filters from that used to evaluate active filters in discrete form. Where sensitivity was previously found to be an adequate and useful measure for Q stability of discrete active filters, the gain-sensitivity product gives an accurate measure of Q stability for hybrid-integrated circuits. Where negative feedback filter schemes were found to be preferable with respect to Q stability when realized in discrete form, positive feedback schemes with their very much lower gain- sensitivity product may be preferable in hybrid-integrated filter circuits. In addition, they require low-gain amplifiers than can be used up to higher frequencies. Q-stability measurements of hybrid- integrated positive feedback, or Sallen-Key-type circuits, which were realized with tantalum thin-film resistors and capacitors combined with beam-leaded operational amplifier chips agree very accurately with the predictions derived from gain-sensitivity calculations.

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Citations
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Sensitivity minimization in a single amplifier biquad circuit

TL;DR: In this paper, the single amplifier biquad (SAB) circuit of J. J. Friend was examined with a view to minimize its sensitivity properties, which involved the proper choice of the free design parameters to achieve a trade off between the contributions due to passive and active element variations.
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Grounded capacitor current-mode oscillator using single current follower

TL;DR: In this paper, a new configuration for realizing a currentmode oscillator using single positive current-follower was presented, and the feasibility of obtaining a quadrature oscillator was investigated.
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VCO controlled by one variable resistor

TL;DR: In this article, a multiloop active filter circuit of Kerwin was shown to yield a VCO whose oscillation frequency is conveniently controlled with one variable resistor, using an FET to obtain the voltage variable resistor.
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Sensitivity and frequency limitations of biquadratic active filters

TL;DR: In this article, a comparative study of single-amplifier filters, fifteen different two-AMplifier circuits, and the state-variable three-AMPLIFIER configuration is given.
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Generation and classification of single amplifier filters

TL;DR: In this article, a unified approach for generating configurations for circuits containing one operational amplifier together with RC elements and capable of realizing a general second-order voltage transfer function is presented, which leads to various single amplifier biquads with the known circuits, as well as some new ones obtained as special cases.
References
More filters
Journal ArticleDOI

FEN filter design using tantalum and silicon integrated circuits

TL;DR: An economical approach to integrated active RC filter design is described and a network synthesis approach based on decomposing a given second-order function into a low Q asymptotic approximation of this function in cascade with an active frequency emphasizing network is obtained.
Journal ArticleDOI

A note on pole, frequency, and Q sensitivity

TL;DR: The variation of frequency and Q, as well as the sensitivity of these two quantities to changes in network elements, are closely and simply related to the variation and sensitivity of the corresponding pole.
Journal ArticleDOI

The operational amplifier in linear active networks

TL;DR: In this paper, the two-port characteristics, gain stability, and sensitivity of the non-ideal operational amplifier are presented. And some of the sensitivity aspects pertaining to network synthesis using operational amplifiers are also discussed.
Journal ArticleDOI

The Sensitivity Function in Variability Analysis

TL;DR: Various results concerning sensitivity which are of direct use in variability analysis are brought together to bring together a relation concerning sensitivity sums which furnishes a valuable check on sensitivity calculation for homogeneous functions.