A new current mode implementation of the reconfigurable analog baseband low pass filter with cell-based variable transconductance amplifier

A new approach with the basis of the gm-C to design reconfigurable current-mode Analog Baseband (ABB) low pass filter is presented in this paper. The transconductance of the gm-C filter is implemented with cell-based variable transconductance amplifier (VTA) to achieve high tuning range as 600kHz to 20MHz. The proposed filter has very low f-3dB frequency when unique cell is active and has high f-3dB frequency when all cell are active. The designed filter operation range covers the wireless applications of Bluetooth, CDMA2000, Wideband CDMA, and IEEE 802.11a/b/g/n wireless LANs and, also is suitable for other wireless applications as 3G/4G. The maximum power consumption of the designed filter is 3.8mW at 20MHz. TSMC 0.18pm technology is used to implement the proposed filter in Cadence environment.