| 摘要 |
PURPOSE:To prevent the occurrence of crossover distortion while the dynamic range is expanded by constituting a full feedback amplifier through the parallel connection of the 1st and 2nd differential amplifiers and through the series connection of output transistors (TR) of each differential amplifier. CONSTITUTION:The non-inverting inputs and the inverting inputs are connected mutually in the 1st and 2nd differential amplifiers 6A, 6B and the 1st output TR 14a of the 1st differential amplifier 6A and the 2nd output TR 14b of the 2nd differential amplifier 6B are connected in series. When an input signal VIN is positive, the 2nd output TR 14b is activated as a load of the 1st output TR 14a and when the input signal VIN is negative, the 1st output TR 14a is activated as a load of the 2nd output TR 14b and they are loads having a large drive capability. Thus, the dynamic range is expanded, the waveform distortion caused in a single buffer amplifier is compensated and a buffer output without waveform distortion is extracted.
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