In a switched operational amplifier including a differential input stage and at least a second output stage, the compensation capacitor commonly required to couple the output node of the second stage with the respective output node of the input differential stage of the amplifier is associated with a switching circuit. The switching circuit is controlled by the same control phase that enables/disables the amplifier for interrupting the connection between the compensation capacitor (CC) and the output node of the differential input stage during a phase in which the amplifier is disabled for reducing the switch-on time. Notably the differential input stage of the operational amplifier remains always active and only the second output stage is switched on and off.
High speed switched op-amp for low supply voltage applications
BASCHIROTTO, ANDREA;CASTELLO, RINALDO
1999-01-01
Abstract
In a switched operational amplifier including a differential input stage and at least a second output stage, the compensation capacitor commonly required to couple the output node of the second stage with the respective output node of the input differential stage of the amplifier is associated with a switching circuit. The switching circuit is controlled by the same control phase that enables/disables the amplifier for interrupting the connection between the compensation capacitor (CC) and the output node of the differential input stage during a phase in which the amplifier is disabled for reducing the switch-on time. Notably the differential input stage of the operational amplifier remains always active and only the second output stage is switched on and off.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
