AMPLIFIER

摘要

PROBLEM TO BE SOLVED: To obtain output signals amplified from plural inputs at an identical amplification factor with-high accuracy and whose number is the same as the number of the plural inputs by switching plural amplifier means so as to amplify each of plural inputs respectively for an equal interval each. SOLUTION: Two outputs A, B of a position detection device(PSD) 2 are given respectively to two amplifier means P, Q via a 1st changeover means 6a of a form of 2-circuit 4-switch contactsϕX,ϕY and outputs R, S of both amplifier means P, Q are respectively given to integration circuits CA, CB as two integration means via a 2nd changeover means 6b. Outputs of the two integration circuits CA, CB are given to two inputs U, V of a signal processing means 3. Then the output A of the PSD 2 is given to the integration circuit CA via the amplifier means P. Conversely an output A of the PSD 2 is given to the integration circuit CA via the amplifier means Q and an output B of the PSD 2 is given to the integration circuit CB via the amplifier means P.