| 摘要 |
A differential amplifier capable of canceling an input offset current and expanding a linearly operating range is disclosed. The differential amplifier, which is preferably applicable to an optical receiver to convert a photocurrent into a voltage signal, includes a trans-impedance amplifier and an offset canceller that detects output offset and extracts input current to cancel the output offset. Moreover, the extracted input current traces the average level of the input voltage to widen the linearly operating range of the trans-impedance amplifier. |
