A third-order Chebyshev filter based on the log-domain principle and integrated in a 1-/spl mu/m BiCMOS process is presented. It has a nominal cutoff frequency of 320 kHz corresponding to a bias current of 1 /spl mu/A, and can be frequency tuned over almost three decades up to about 10 MHz. It operates with a nominal supply voltage of 1.2 V, maintaining a dynamic range (DR) at 1% THD of 57 dB. For cutoff frequencies in the range of 10 kHz, the supply voltage can be reduced down to 0.9 V. The filter occupies an active area of 0.25 mm/sup 2/ and dissipates 23 /spl mu/W, corresponding to a power consumption per pole and edge frequency of only 24 pJ. These results demonstrate the potential of log-domain filters for very low-voltage and low-power applications.
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机译：提出了一种基于对数域原理并集成在1- / spl mu / m BiCMOS工艺中的三阶Chebyshev滤波器。它具有320 kHz的标称截止频率，对应于1 / spl mu / A的偏置电流，并且可以在将近三十年的时间内进行频率调谐，直至约10 MHz。它的额定电源电压为1.2 V，在1％THD时的动态范围（DR）为57 dB。对于10 kHz范围内的截止频率，可以将电源电压降低至0.9V。滤波器的有效面积为0.25 mm / sup 2 /，耗散23 / spl mu / W，对应于每极功耗边缘频率仅为24 pJ。这些结果证明了对数域滤波器在极低电压和低功率应用中的潜力。
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