| 摘要 |
A microphone amplifier is provided to improve the sensitivity of a microphone by reducing the generation of floor noises and improving a signal to noise ratio. A microphone amplifier includes a condenser microphone(100), an operational amplifier(101), a condenser(103), and a resistor(104). The condenser microphone converts voice into a voltage signal. The operational amplifier has an inverting input terminal(-) to receive the voltage signal from the condenser microphone, and a non-inverting input terminal(+) to receive series bias voltage. The condenser is connected between the inverting input terminal of the operational amplifier and an output terminal(102). The resistor is connected between the inverting input terminal of the operational amplifier and the output terminal. |
