By Costas Laoudias
This publication describes the layout of low-voltage analog built-in filters utilizing present mirrors, some of the most universal construction blocks either in analog and mixed-signal VLSI circuits, supplying some great benefits of low-voltage operation, derivation of resistorless topologies and digital adjustment strength in their frequency features. numerous layout examples are defined, utilizing present mirrors that satisfy the necessities of recent low-power instant and biomedical functions, equivalent to common biquadratic filter out topologies, advanced filters for Bluetooth/ZigBee low-IF receivers and Wavelet filters for cardiac sign detection. The experimental effects from the fabricated chips may also be offered, exhibiting their software in smooth low-voltage low-power transportable devices.
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Additional resources for Integrated Filters for Short Range Wireless and Biomedical Applications
11. M. Soliman, “Voltage mode and current mode Tow Thomas biquadratic filters using inverting CCII”, International Journal of Circuit Theory and Applications, vol. 35, no. 4, pp. 463–467, Jul. 2008. 12. I. J. S. Hwang, “New current mode biquad filter using current followers”, IEEE Transactions on Circuits and Systems I, vol. 42, no. 7, pp. 380–383, Jul. 1995. 13. M. Okine, and N. Katsuhara, “Current-mode active RC filters using current followers”, Analog Integrated Circuits and Signal Processing, vol.
34 2 Universal Biquads Using Current Mirrors Fig. 5 Summary In this chapter novel SIMO and MISO universal biquads using low-voltage current mirrors have been presented. The proposed universal biquads provide the five standard filter functions while offering the feature of orthogonal adjustment between the resonant frequency and the quality factor. The behavior of the proposed filters is evaluated through simulation results, where the most important performance factors have been considered. 35 mm C35B4C3 CMOS process and verified through extensive experimental measurements.
22 2 Universal Biquads Using Current Mirrors c d Fig. 5 28 Experimental Results Differential filters are more preferable than the conventional single-ended filters in modern analog processing systems. This is originated from the fact that the differential structures offer improved performance in terms of linearity and noise rejection . Thus, the proposed universal SIMO and MISO biquads in Fig. 35 mm n-well CMOS process. 4 Experimental Results 23 Fig. 1 C ii+ 1:1 Fig. 10 Differential low-voltage lossless integrator using current mirrors 1:1 1:1 C 2:1 Differential Integrators Using Current Mirrors A fully balanced lossy integrator consisting of a pair of cross-coupled current mirrors is shown in Fig.