Amplifying circuit

  • Inventors:
  • Assignees: Hitachi Ltd
  • Publication Date: May 01, 1980
  • Publication Number: JP-S5558817-A

Abstract

PURPOSE:To decrease the number of IC elements and the number of pins, by utilizing the function of the gain correction and amplifying circuit switching the gain ratio at specific period to obtain two outputs in which the gain ratio at specific period is mutually inverted. CONSTITUTION:When the base potential of the transistors Tr5 and 8 is higher than that of Tr5 and 7, Tr5 and 8 are ON and Tr6 and 7 are OFF. The small signal 21 inputted from the base of Tr9 and 10 is amplified with equal value of resistors 13 and 14 and it is outputted at the terminals 3 and 4. Further, if the base potential of Tr5 and 8 is lower than the base potential of Tr6 and 7, Tr5 and 8 are OFF and Tr6 and 7 are ON. The gain ratio of the terminals 3 and 4 by the switching of Tr5 to 8 is determined with the emitter load of Tr9 and 10, the gain ratio is inverted mutually when Tr5 and 8 are changed from ON to OFF state, and the gain ratio can be determined with the emitter load of Tr9 and 10.

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