Grounded-capacitor SRCOs using a single differential difference complementary current feedback amplifier

The usefulness of a new active building block, the ‘differential difference complementary current feedback amplifier' (DDCCFA) in realising single resistance controlled oscillators (SRCO) employing grounded capacitors has been demonstrated and using a state-variable methodology, a number of new single DDCCFA-based SRCOs have been derived. It is shown that the new SRCOs possess features, all of which are not available simultaneously in any single active building block-based SRCOs known earlier. The workability of the proposed circuits has been varified by SPICE simulations using a DDCCFA implementable in 0.35 micron CMOS technology.