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1090 ⏐⏐⏐ DECIBELS, FILTERS, AND BODE PLOTS dB<br />

+<br />

V i<br />

–<br />

+<br />

V i<br />

–<br />

R 1<br />

90 k�<br />

R 2<br />

C<br />

FIG. 23.116<br />

Problem 41.<br />

R 1<br />

3.3 k�<br />

C<br />

0.05 mF<br />

10 k�<br />

R 2<br />

FIG. 23.118<br />

Problem 43.<br />

800 pF<br />

0.5 k�<br />

+<br />

V o<br />

–<br />

+<br />

V o<br />

–<br />

SECTION 23.12 Low-Pass Filter with<br />

Limited Attenuation<br />

41. For the filter of Fig. 23.116:<br />

a. Sketch the curve of AvdB versus frequency using the<br />

idealized Bode plots as a guide.<br />

b. Sketch the curve of v versus frequency.<br />

*42. For the filter of Fig. 23.117:<br />

a. Sketch the curve of AvdB versus frequency using the<br />

idealized Bode plots as a guide.<br />

b. Sketch the curve of v versus frequency.<br />

+<br />

V i<br />

–<br />

R 1<br />

20 k�<br />

R 2<br />

12 k�<br />

SECTION 23.13 High-Pass Filter with<br />

Limited Attenuation<br />

43. For the filter of Fig. 23.118:<br />

a. Sketch the curve of AvdB versus frequency using the<br />

idealized Bode plots as an envelope for the actual<br />

response.<br />

b. Sketch the curve of v (the angle by which Vo leads Vi) versus frequency.<br />

*44. For the filter of Fig. 23.119:<br />

a. Sketch the curve of AvdB versus frequency using the<br />

idealized Bode plots as an envelope for the actual<br />

response.<br />

b. Sketch the curve of v (the angle by which Vo leads Vi) versus frequency.<br />

+<br />

V i<br />

–<br />

R 1<br />

2 k�<br />

R 3<br />

FIG. 23.117<br />

Problem 42.<br />

R 2<br />

1.2 k�<br />

C<br />

0.1 mF<br />

FIG. 23.119<br />

Problem 44.<br />

6 k�<br />

C 0.01 mF<br />

R 3<br />

4.7 k�<br />

+<br />

V o<br />

–<br />

+<br />

V o<br />

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