Question

(The Art of Electronics 3rd edition, page 232)

A. optional inverter 1 o ert, or amplify with- The circuits in Figure 4.19 let you invert, or amplify with out inversion, by flipping a switch. The voltage gain is either or -I, depending on the switch position. The "switches" can be CMOS analog switches8, which let you control the sense of inversion with a (digital) signal. The clever variation of Figure 4.20 lets you vary the gain con- tinuously from follower to inverter. And when the pot R1 is at mid-position, the circuit does nothing at all! Exercise 4.4. Show that the circuits in Figure 4.19 work as adver tised. 10.0k 10.0k in out follower nvert A. 10.0k 10.0k in out Out 5k B. Figure 4.19. Optional inverters; G ± 1.0

Answer 1

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