Current switch circuit having an active load

Details Current switch circuit having an active load Current switch circuit having an active load

H - Electricity

03

K

328/196

H03K 17/60 (2006.01) H03K 17/04 (2006.01) H03K 17/62 (2006.01)

Patent

CA 1089034

CURRENT SWITCH CIRCUIT HAVING AN ACTIVE LOAD ABSTRACT An improved current switch circuit which has an active load is disclosed. The active load comprises a current source at the collectors of switch transistors which generates a current which is less than the current generated by the current source at the emitters of the switch transistors. The active load also includes a circuit for supplying the current difference between source cur- rents as a supplementary current to the current source at the emitters when the associated switch transistors are conductive and a circuit for diverting the source current at the collectors when the switch transistors are non-conduc- tive. Depending on the current generated by the current sources, the performance of the circuit can be selected to optimize power dissipation versus switching speed. The circuit uses a minimum of resistors and a minimum amount of semiconductor area and thereby ensures low power dis- sipation.

280302

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