| 摘要 |
<p>A telephone line interface circuit (10) provides an interface between a telephone line (11, 12) and line powered telephone circuits. A first portion (20) of the circuit presents predetermined impedance, current and voltage characteristics to the telephone line (11, 12). A serial regulator portion (30) is coupled to receive current from the line (11, 12) and has an output terminal for providing a regulated output voltage as a supply voltage for the first portion (20) and for the line powered telephone circuits. In this way, current drawn from the line is shared between the first portion (20) and the serial regulator portion (30).</p> |
