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4675594 | Reinke | Jun 1987 | |
4896333 | Can | Jan 1990 | |
5469047 | Kumamoto et al. | Nov 1995 | |
5498953 | Ryat | Mar 1996 |
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Koyama, Mikio et al., "A 2.5V Active Low-Pass Filter Using All-n-p-n Gilbert Cells with a 1-V.sub.p-p Linear Input Range," IEEE Nov. 1993, pp. 1-8. |