| 摘要 |
PURPOSE:To obtain a high S/N by constituting the titled amplifier circuit with a summing amplifier and an amplifier group constituted by connecting input/output terminals of plural unit amplifiers in parallel, synthesizing the amplified outputs individually for the same input signal at an output side. CONSTITUTION:n-Set of unit amplifier cells HA1, HA2, HA3,...,HAn are constituted by connecting input/output terminals in parallel respectively and the unit amplifier cells HA1, HA2, HA3,...,HAn amplify a signal voltage respectively given from a terminal A. The amplified signal voltage is synthesized at the output side of the unit amplifier cells HA1, HA2, HA3,...,HAn, amplified by the summing amplifier SA and further amplifier to a prescribed output level by an output amplifier PA. The noise Ni converted to the input of the unit amplifier cells HA1, HA2, HA3,...,HAn is expressed as Ni1, Ni2, Ni3,...,Nin and the noise has a random property independently except a noise component by a common input terminal resistor. Thus, the S/N is improved remarkably.
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