| 摘要 |
PURPOSE: An amplifier circuit and a digital microphone using the same are provided to eliminate noises and a distortion characteristic by designing an amplifier circuit with a differential error amplifier. CONSTITUTION: A voice processing chip(400) comprises a buffer circuit(500), an amplifier circuit(600), an analog to digital converter(700), and a bias voltage generation part(800). The buffer circuit generates a first to a sixth differential bias voltage in response to a first bias voltage and an input signal. The amplifier circuit generates a first and a second differential amplifier signal in response to the first to the sixth differential bias voltage. The analog to digital converter generates a single bit digital voice signal in response to the first and the second differential amplifier signal. The bias voltage generation part generates the first bias voltage and a second bias voltage. |
