Invention Grant
US09402131B2 Push-pull microphone buffer 有权
推挽麦克风缓冲器

Push-pull microphone buffer
Abstract:
A buffer is coupled to an acoustic motor. The buffer has an input and an output. The input has an input voltage and the output has an output voltage. The buffer is coupled to a load. The buffer includes an input transistor and push-pull transistor circuitry. The input transistor has a gate, a source, and a drain, a gate-to-source capacitance, and an area. The push-pull transistor circuitry is coupled to the input transistor. Under a first set of operating conditions, the gate to source voltage of the input transistor remains constant and the output voltage is a buffered copy of the input voltage. Under a second set of operating conditions, the push-pull transistor circuitry selectively sinks or sources additional current to the load so that linearity of buffer operation is provided. A gate-to-drain capacitance of the input transistor is buffered allowing the area of the input transistor to be increased without reducing the gain of the motor.
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