| 摘要 |
PURPOSE:To improve high-frequency characteristics by providing a npn transistor in front of each pnp differential transistor. CONSTITUTION:To the base and emitter of a differential amplifier composed of pnp transistors Q1 and Q2 with their emitters connected in common, npn transistors Q3 and Q4 are connected at emitters and collectors respectively. Applying an input signal to npn transistors forms positive feedback loops between pnp transistors and npn transistors. As a result, even if pnp transistors low in high-band cut-off frequency would be used, characteristics can be improved extending to the high frequency range by npn transistors. Therefore, a video detection output circuit, etc., can be realized by using pnp lateral transistors. |
