Low-voltage composite BiCMOS cells for analog signal processing applications

A basic composite BiCMOS cell has been used in the realization of complementary gain-tunable circuits of stacked and folded-composite nature. Replacement of stacked versions with their folded-composite equivalents considerably decreases the supply voltage from /spl plusmn/3V to /spl plusmn/1.5V. The proposed designs also function with large input signal linearity at reduced supply voltages. HSPICE simulation results verifies the operation of the circuits using the 2 /spl mu/m MOSIS model parameters.