Abstract
This paper presents a systematic analysis to determine the tuning range limitations of biquadratic OTAC filter architectures, as well as a strategy for the selection of minimum parasitic effects filter structures for a given transfer function (filter type). The analysis uses an OTA macromodel that includes finite input and output impedances along with frequency-dependent transconductance. Experimental data of the macromodel parameters of real OTAs along with analytical results are used to estimate the practical tuning (bounds) limitations of the different biquadratic filter structures. Some of the available transfer functions from these filter architectures present minimum parasitic effects. Experimental results from CMOS chip tests showed agreement with the minimum parasitic effects theoretical results.
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F.Krummenacher and N.Joehl, “A 4-MHz CMOS continuous-time filter with on-chip automatic tuning”, IEEE J. Solid-State Circ., vol. 23, no. 3, pp. 750–758, 1988.
F. Krummenacher, “Design considerations in high-frequency CMOS transconductance amplifier capacitor (TAC) filters”, in IEEE/ISCAS '89, 1989, pp. 100–105.
B. Nauta and E. Seevinck, “Automatic tuning of quality factors for VHF CMOS filters”, in Proc. IEEE/ISCAS, New Orleans, LA, 1990, pp. 1147–1150.
V. Gopinathan and Y.P. Tsividis, “Design consideration for integrated continuous-time video filters“, in Proc. IEEE/ISCAS '90, New Orleans, LA, 1990, pp. 1177–1180.
K.H. Loh, D. Hiser, W. Adams, and R.L. Geiger, “A robust digitally programmable and reconfigurable monolithic filter structure”, in Proc. IEEE/ISCAS, vol. 1, 1989, pp. 110–113.
H.Khorramabadi and P.R.Gray, “High-frequency CMOS continuous-time filters”, IEEE J. Solid-State Circ., vol. 19, no. 6, pp. 939–948, 1984.
C.S. Park and R. Schaumann, “Design of an eight-order fully integrated CMOS 4 MHz continuous-time bandpass filter with digital/analog control of frequency and quality factor”, in Proc. IEEE/ISCAS, 1987, pp. 754–757.
H. Nevárez-Lozano, J.A. Hill, and E. Sánchez-Sinencio, “Frequency limitations of continuous-time OTA-C filters”, in Proc. IEEE/ISCAS, vol. 3, Espoo, Finland, 1988, pp. 2169–2172.
E.Sánchez-Sinencio, R.L.Geiger, and H.Nevárez-Lozano, “Generation of continuous-time two integrator loop OTA filter structures”, Trans. Circ. Systems, vol. 35, no. 8, pp. 936–946, 1988.
J.Ramírez-Angulo and E.Sánchez-Sinencio, “Comparison of biquadratic OTA-C filter structures from the tuning point of view”, in Proc. 31st Midwest Symp. Circuits and Systems, St. Louis, MO, Elsevier Science, 1988, pp. 510–514.
W.J.A.deHeij, E.Seevinck, and K.Hoen, “Practical formulation of the relation between filter specifications and the requirements for integrator circuits”, IEEE Trans. Circ. Systems, vol. 36, no. 8, pp. 1124–1128, 1989.
K.A. Kozma, D.A. Jones, and A.S. Sedra, “An adaptive tuning circuit for integrated continuous-time filters”, in Proc. IEEE/ISCAS, New Orleans, LA, 1990, pp. 1163–1166.
B.Linares-Barranco, A.Rodríguez-Vázquez, E.Sánchez-Simencio, and J.L.Huertas, “CMOS OTA-C high-frequency sinusoidal oscillator”, IEEE J. Solid-State Circ., vol. 26, no. 26, pp. 160–164, 1991.
A.Nedungadi and R.L.Geiger, “High-frequency voltage controlled continuous time low-pass filter using linearized CMOS integrators”, Electron. Lett., vol. 22, pp. 729–731, 1986.
E.Säckinger and W.Guggenbühl, “A high-swing, high-impedance MOS cascode circuit”, IEEE J. Solid-State Circ., vol. SC-25, no. 1, pp. 289–298, 1990.
J.Ramírez-Angulo and E.Sánchez-Sinencio, “Active compensation of operational transconductance amplifiers using partial positive feedback”, IEEE J. Solid-State Circ., vol. 25, no. 4, pp. 1024–1028, 1990.
M.R.Kobe, J.Ramírez-Angulo, and E.Sánchez-Sinencio, “FIESTA—A filter educational synthesis teaching-aid”, IEEE Trans. Education, vol. 32, no. 3, pp. 280–286, 1989.
H. Nevárez-Lozano, “Biquadratic OTA-C filters”, Ph.D. dissertation, Texas A&M University, May 1991.
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Nevárez-Lozano, H., Sánchez-Sinencio, E. Minimum parasitic effects biquadratic OTA-C filter architectures. Analog Integr Circ Sig Process 1, 297–319 (1991). https://doi.org/10.1007/BF00239678
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DOI: https://doi.org/10.1007/BF00239678