Figure 7.8. On the left the lower input terminal is grounded. The upper input terminal goes to one end of a resistor labeled 2R. The other end of this resistor goes through another resistor labeled R to the noninverting input of the op amp. The junction of the two resistors goes through a capacitor labeled C, to the output of the op amp. Another capacitor labeled C goes from the noninverting input to ground. The output is connected to the inverting input. The output of the op amp goes to the upper output terminal of the circuit. The lower output terminal is grounded. End verbal description.
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