Low-power MOS integrated filter with transconductors with spoiltcurrent sources |
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| Authors: | van de Gevel M Kuenen JC Davidse J Roermund AHM |
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| Affiliation: | Dept. of Electr. Eng., Delft Univ. of Technol. ; |
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| Abstract: | It is shown that an MOS weak-inversion differential pair can be linearized considerably by replacing the tail current source with a MOSFET biased in the weak-inversion triode region. Calculations show that the transconductance can be kept constant to within +5%/-0% for input voltages up to 130 mV. This linearized differential pair is used in a third-order transconductance-C bandpass filter with 18 Hz and 142 Hz cutoff frequencies, which draws 4.9 nA from a 1.8-V supply. Its dynamic range is 62 dB and its active area is 0.5 mm2 |
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