12–86 Design Evaluation In a cable service distribution station, you need a bandstop filter to meet the following requirements: Design Requirements: Passband gain: 10 ± 5%, B=

3:3 kHz ± 5%, f0 =500Hz ± 2%, fCL =75Hz ± 10%. Filter must interface with a 50-Ω source and a 500-Ω load.

Evaluation Criteria: Filter performance including depth of notch, parts count, power usage, ease of maintenance, use of standard parts, and cost.

The two vendors have responded with the designs shown in Figure P12–86.

As an engineering cable guy, your supervisor asks you to evaluate the two designs and recommend a vendor. Which vendor would you recommend and why?

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+9 Vi(1) 10 0.005 20 ww 20 ww 0.05 F HH 40 www 10 w 50 w + w vo(f) 10 Vendor A $23.00 82.02 + + 4.3 mH Vi(t) w vo(t) 9.12 24 F 1 FIGURE P12-86 Vendor B $22.00