Digitally programmable active-RC filter
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United States of America Patent
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Aug 13, 2013
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app pub date -
Apr 2, 2012
filing date -
Apr 2, 2012
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Abstract
The digitally programmable active-RC filter provides an active-RC filter having programmable time constants. An inherently linear current division network (CDN) provides the programmable time constants while preserving a high linearity property of the active-RC filter. Using this approach, wide tuning characteristics are achieved. The programmable active-RC filter uses two op-amps per integrator. Cross-coupling two of the units configured with I and Q inputs provides the reconfigurable filter with a complex bandpass and normal lowpass response. One embodiment is formed as a fourth-order filter fabricated in a standard 0.18 μm CMOS process. The complex and lowpass filters achieve in-band spurious-free dynamic ranges (SFDRs) of about 70 dB and 71 dB for bandwidths of 1 MHz and 5.5 MHz, respectively.
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