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A tunable gm-C filter with low variation across process, voltage and temperature

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3 Author(s)
Q. A. Khan ; Semicond. Product Sector, Motorola India Ltd., Gurgaon, India ; S. K. Wadhwa ; K. Misri

A tunable gm-C filter with cutoff frequency insensitive to Process, Voltage and Temperature is proposed. An external clock frequency is used to generate a current using a switched capacitor circuit. The proposed filter is ideally suited for applications where a tight control on cutoff frequency is desired across different operating conditions of the chip. The circuit was designed in 3.3 V BiCMOS technology and simulations were carried out using SPICE. The simulation results show that the total variation in the cutoff frequency is 1% as compared to the 27% variation in conventional gm-C filter over the temperature range of -40 to 120 degC. The variation across process corners is 2.4% and is almost independent of the capacitor variation due to process and temperature.

Published in:

VLSI Design, 2004. Proceedings. 17th International Conference on

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