Abstract
A low-power analog filter able to be reconfigured in order to be used in UMTS and WLAN applications is reported. The 4th order low-pass continuous-time filter is going to be included in the receiver path of a reconfigurable terminal. The filter is made up by the cascade of two Active-G$_m$-RC low-pass biquadratic cells. The unity-gain-bandwidth of the opamps embedded in the Active-G$_m$-RC cells is comparable to the filter cut-off frequency. Thus, the power consumption of the opamp can be strongly reduced. In addition, the filter can be programmed in order to process UMTS and WLAN signals, while a little area overhead is required since the filter can share capacitors as well as opamps in both operations modes. The cut-off frequency deviation due to the technological spread, aging and temperature variation is adjusted by using a tuning circuit.The full device in a 0.13 μ$m CMOS technology occupies a 2.8 mm2area.
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D'amico, S., Giannini, V. & Baschirotto, A. A Low-Power Reconfigurable Analog Filter for UMTS/WLAN Receivers. Analog Integr Circ Sig Process 46, 65–72 (2006). https://doi.org/10.1007/s10470-005-4586-2
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DOI: https://doi.org/10.1007/s10470-005-4586-2