A low-noise high-precision operational amplifier

Laude, D.

doi:10.1109/jssc.1981.1051672

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…From Equations (22) and (23), it follows that for small q the values of k 1 2 (both with index B and L) are approximately equal to 16Áq 1 = 16Áq n , where n is the order of the filter. Because q is a small number, the value of the squared modulus k 1 2 ffi16Áq n rapidly decreases with increasing filter order n. For example, with o s = 1.30541 and n = 3, (k 1 2 ) n=3 ffi0.002664895, and for n = 4, (k 1 of the tuning block n B , we can neglect (k 1 2 ) L in Equation (29) and maintain the influence of (k 1 2 ) B . Solving for the optimum x B , i.e.…”

Section: A3 Optimum Distribution Of Pass-band Attenuation a Max Formentioning

confidence: 99%

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Ladder tuning‐block partitioned filters for simplified tuning

Jurisic

Moschytz

2012

Circuit Theory & Apps

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SUMMARY In this paper, we present a procedure for the design of low‐sensitivity, active‐RC filters that permits efficient functional tuning during the manufacturing process. Filters with finite zeros, such as elliptic (Chebyshev–Cauer) low‐pass filters are primarily considered, although the method can be applied to the design of other filters, e.g. allpole filters, as well. We show how to partition a given ladder filter into two parts. The first is a ladder filter of reduced order compared to the original; the second is a second‐ or third‐order active‐RC filter section, the ‘tuning block’, which, alone is used to tune the overall filter. The ladder, the components of which are fixed, provides most of the selectivity, while the cascaded tuning block determines the band‐edge characteristics and can be tuned relatively easily. A detailed design procedure for the filter partitioning is given. By obtaining a doubly terminated ladder filter, which is cascaded with a tuning block, both the inherent low sensitivity of the ladder and the tunability of the tuning block, are maintained. A Monte Carlo analysis of the partitioned filter demonstrates that the low sensitivity with respect to component tolerances, achievable by maintaining a doubly terminated ladder structure for the larger partitioned part of the filter, is preserved. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: A3 Optimum Distribution Of Pass-band Attenuation a Max Formentioning

confidence: 99%

“…Depending on the technology and circuit, laser or other methods of continuously trimming resistors are available (e.g. ). Tuning methods in discrete steps are based on the switching in or out of discrete units of resistor or capacitor arrays (e.g.…”

Section: Practical Considerationsmentioning

confidence: 99%