| 摘要 |
1,257,316. Absolute value generating circuits. INTERNATIONAL BUSINESS MACHINES CORP. 4 Nov., 1968 [9 Nov., 1967], No. 52180/68. Heading H3W. [Also in Division G4 An absolute value circuit for producing an output signal of one polarity irrespective of the polarity of the input signal comprises a first negative feedback amplifier 1 having two output terminals providing selection devices through respective polarity signals of respective polarities and a further negative feedback amplifier 2 which inverts one signal only. As shown, the respective polarities are selected by diodes in the feedback path of the first amplifier and the signals are fed to the inverting and non- inverting inputs of the second amplifier. Potentiometers adjust the offset to zero and the gain to unity. |
