Digital frequency tuning technique based on current division for integrated active RC filters

• DOI: 10.1049/el:20030911
• Publication Date: 2003-09-18T08:50:51Z
• Authors: Kong-Pang Pun; Chiu-Sing Choy; Cheong-Fat Chan; J.E. da Franca
• Keywords: Current mirror; Active networking; Current divider; Linearity

A novel digital frequency tuning technique is presented for integrated active RC filters. Instead of varying the values capacitors or resistors as in traditional approaches, proposed achieves by dividing currents that flow from to virtual grounds. Current division performed through a digitally programmable current network added at each ground. The features compact size, wide range and high linearity. Transistor level simulation results are demonstrate technique.