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- Title
Digitally Programmable Fully Differential Filter.
- Authors
Beg, Parveen; Khan, Iqbal A.; Maheshwari, Sudhanshu; Siddiqi, Muzaffer A.
- Abstract
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.
- Subjects
ELECTRIC filters; ELECTRIC potential; ELECTRICAL conductors; ELECTRIC resistors; CAPACITORS; BANDPASS filters; DIGITAL control systems
- Publication
Radioengineering, 2011, Vol 20, Issue 4, p917
- ISSN
1210-2512
- Publication type
Article