| 摘要 |
PURPOSE:To extend the dynamic range and to increase the performance of audio amplifiers, by providing two differential amplifying circuits using transitors of different conduction types. CONSTITUTION:When the transistors Q1, 5 are conductive, the current flowing to Q1 flows through the capacitor 10, Q5 as well as the constant current circuit 3. The current also flows in Q4 through the capacitor 10 when Q2, 4 are conductive similarly. This current flows only at transient time until the capacitor 10 saturates. Accordingly, this circuit allows the current exceeding that limited with the constant current circuits 3 and 6. Greater current depending on greater input signal can be flowed, allowing to extend the dynamic range. |
