12–84 Design Evaluation Your company issued a request for proposals listing the following design requirements and evaluation criteria.

Design Requirements: Design a low-pass filter with a passband gain of 9 ± 10% and a cutoff frequency of 90 ± 10%krad=s. A sensor drives the filter input with a 1-kΩ source resistance and an open-circuit voltage range of ± 1:6V.

Evaluation Criteria: Filter performance, parts count, use of standard parts, and cost.

The two vendors have responded with the designs shown in Figure P12–84.

As a junior engineer, the project manager asks you evaluate the designs and recommend a vendor. Which vendor would you recommend and why?

+ First-Order Filter Company Vcc = 15 V 3.3 W 8.2 3300 pF VOUT(1) VIN(t) w 1 3.3 w Unit Cost: $29.00 Simply Filters, Ltd Vcc = 15 V ww 68 VOUT(t) VIN(f) 3300 pF 8.2 Unit Cost: $20.99 FIGURE P12-84