| 摘要 |
The present invention amplifier circuit for connection to input and output devices, e.g. speakers includes input amplifier; positive power supply input; negative power supply input; first bias input means; second bias input means; a first differentiator/summer, receiving signals from the input amplifier, from the positive power supply input and from the first bias input means; a second differentiator/summer, receiving signals form the input amplifier, from the negative power supply input and from the second bias input means. There are PMOS and NMOS devices receiving signals from respective differentiator/summers, receiving power form the positive and negative power supply inputs and receiving signals from respective A. C. signal paths. Thus, there are first and second A. C. signal paths, each receiving signals from the input amplifier and sending resultant signals to the PMOS and NMOS devices, respectively; and an output terminal receiving signals from said PMOS and NMOS devices. Each differentiator/summer acts to assure that the gate tracks the source of its MOS device so that the gate-source potentials of the MOS devices are unaffected by changes in the potential of the power supply; and they send signals to the MOS devices respectively only upon potential differences in signals between the bias input means and the input amplifier signals. The first A. C. signal path and the second A. C. signal path provide parallel paths to the MOS device respectively to bypass the differentiator/summers, when signals from the input amplifier exceed a preset frequency.
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