Biquadratic SC filters with small GB effects Academic Article

abstract

• The effects of proper switch phasing in SC filters to yield low gain-bandwidth (GB) product dependence is discussed. A figure of merit for comparing GB effects in SC networks based upon the topology dependent effective GB matrices has been introduced. Motivated by this consideration, two general biquadratic switched-capacitor filter structures are presented. These circuits are stray-insensitive, have small 0 and Q sensitivities, and are easy to apply. A significant feature of these biquads is their reduced dependence on the operational amplifier GB product. Filter center frequencies up to the 50KHz range are feasible for op amps with typical values of GB/2=106hz, making these circuits attractive for high-frequency applications. The advantages of the proposed structures are demonstrated by an example. Results enabling the designer to determine the 0 and Q deviations for different values of GB are presented. A comparison of theoretical and experimental results shows good agreement. 1984 IEEE.

authors

• Silva-Martinez, Jose

published proceedings

• Circuits and Systems

author list (cited authors)

• Sanchez-Sinencio, E., Silva-Martinez, J., & Geiger, R.

citation count

• 33

complete list of authors

• Sanchez-Sinencio, E||Silva-Martinez, J||Geiger, R

publication date

• October 1984

publisher

• Institute of Electrical and Electronics Engineers (IEEE)  Publisher

published in

• IEEE Transactions on Circuits and Systems  Journal

Digital Object Identifier (DOI)

• 10.1109/tcs.1984.1085438

start page

• 876

end page

• 884

volume

• 31

issue

• 10

URL

• http%3A%2F%2Fdx.doi.org%2F10.1109%2Ftcs.1984.1085438