Actas de congresos
On designing linearly tunable high-Q OTA-C filters with low sensitivity
Fecha
2004-09-07Registro en:
Proceedings - IEEE International Symposium on Circuits and Systems, v. 1.
0271-4310
10.1109/ISCAS.2004.1328121
2-s2.0-4344706334
Autor
Universidade Estadual Paulista (Unesp)
Institución
Resumen
This paper discusses a design approach for a high-Q low-sensitivity OTA-C biquad bandpass section. An optimal relationship is established between transconductances defining the differenceβ - γ in the Q-factor denominator, setting the Q-sensitivity to tuning voltages around unity. A 30-MHz filter was designed based on a 0.35μn CMOS process and VDD=3.3V. A range of circuit simulation supports the theoretical analysis. Q-factor spans from 20.5 to 60, while ensuring filter stability along the tuning range. Although a Mode-operating OTA is used, the procedure can be extended to other types of transconductor.