Top-down design of a switched-current video filter
Jennifer B. Hughes · IEE Proceedings - Circuits Devices and Systems · 2000
A case study for the design of switched-current filters is presented. While the emphasis is on the step-by-step numerical design of a video filter, the design flow is applicable to any switched-current filter. The chosen design example is a low pass elliptic ladder filter with the following specification: passband 0.5 dB equiripple, stop-band attenuation > 30 dB, –3 dB frequency of 8 MHz, sampling frequency of 80 MHz, signal-to-noise ratio of 60 dB. All aspects of the design are covered from filter specification, through filter synthesis, circuit definition and finally transistor sizing for CMOS implementation.