
Switched-Capacitor Data Converters
185
In [27], an offset-insensitive multiply-by-two SC amplifi er that can complete one
multiplication within three clock cycles is reported. However, the reduction of con-
version time is made possible by including three instead of two capacitors in the SC
amplifi er.
Moreover, both of the previous multiply-by-two amplifi ers suffer from the effects
of the insuffi cient op-amp gain, or, equivalently, the fi nite op-amp gain. If the op-
amp gain is not suffi ciently large, the negative input terminal of the op-amp can no
longer be considered a virtual ground, and thus an additional gain error will occur.
Chin and Wu [28] ...