Digitally Programmable Fully Differential Filter
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In this paper a new digitally programmable voltage mode fully differential Kerwin-Huelsman-Newcomb(KHN) ﬁlter is realized using digitally controlled CMOS fully balanced output transconductor (DCBOTA). The realized ﬁlter uses ﬁve DCBOTAs, a single resistor and two capacitors. The ﬁlter provides low-pass, high-pass and band-pass responses simultaneously. The pole-frequency of all the responses is controlled by externally applying an 8- bit digital control word. All the responses exhibit independent digital control for pole-ω0 and pole-Q. The proposed ﬁlter also offers low passive sensitivities. Non-ideal gain and parasitic associated with the actual DCBOTA is also discussed. The CMMR results for low-pass response are also included which highlight the advantage of a fully-differential operation. Exhaustive PSPICE simulation is carried out using 0.5µ technology which may be further scaled to explore state-of-the-art applications of the proposed circuit.
KeywordsFully differential, digital control, KHN filter
Document typePeer reviewed
Document versionFinal PDF
SourceRadioengineering. 2011, vol. 20, č. 4, s. 917-925. ISSN 1210-2512
- 2011/4