论文信息 - A low power 44-300 MHz programmable active-RC filter in 0.18 μm CMOS

A low power 44-300 MHz programmable active-RC filter in 0.18 μm CMOS

We present a widely programmable fifth order Chebyshev opamp-RC ladder filter whose 3 dB bandwidth is digitally tunable over a 7X range, from 44-300 MHz. The opamp uses feed-forward compensation to achieve high DC gain and wide bandwidth with reduced bias currents. The principle of "constant capacitance scaling" is used to maintain the shape of the filter response when the bandwidth is changed by a large factor. The filter consumes 36 mW from a 1.8 V supply and has a dynamic range of 56.6 dB.

Shanthi Pavan | Tonse Laxminidhi | Venkata Prasadu

[1] Shanthi Pavan,et al. A Technique for Accurate Frequency Response Measurement of Integrated Continuous-Time Filters , 2006, IEEE Custom Integrated Circuits Conference 2006.

[2] Yannis Tsividis,et al. Integrated continuous-time filter design - an overview , 1994, IEEE J. Solid State Circuits.

[3] Yannis Tsividis,et al. Time-scaled electrical networks. Properties and applications in the design of programmable analog filters , 2000 .

[4] Y.P. Tsividis,et al. Widely programmable high-frequency continuous-time filters in digital CMOS technology , 2000, IEEE Journal of Solid-State Circuits.

[5] H. Khorramabadi,et al. Baseband filters for IS-95 CDMA receiver applications featuring digital automatic frequency tuning , 1996, 1996 IEEE International Solid-State Circuits Conference. Digest of TEchnical Papers, ISSCC.

[6] N. Weste,et al. A 500 MHz CMOS anti-alias filter using feed-forward op-amps with local common-mode feedback , 2003 .