| 摘要 |
A subscriber telephone line interface circuit is provided with reduced power stand-by mode. For 90% of the time such circuits only have a function of monitoring the line. Means are described for considerably reducing the power consumption of the circuit during such monitoring periods. The reduction is provided essentially by modifying the construction of the output stages connected to the telephone line; these stages become generators of a fixed voltage for biasing the line when the circuit is in monitoring mode. |
