A wide-range differential difference operational floating amplifier (DDOFA) is introduced. The DDOFA is a new block useful for continuous-time analog signal processing. The DDOFA is realized using a differential difference transconductor with large signal handling capability and a single input differential output current op-amp. The DDOFA forces two differential voltages to the same value and provides two balanced output currents. This brief presents a CMOS realization of the DDOFA, and some of its applications are provided, such as a voltage-to-current converter, MOS-grounded and floating resistors, a MOS multiplier/divider cell, a differential integrator, a continuous-time MOS-C filter, a MOS-C current oscillator, and a MOS-C floating inductor. Simulation results for the DDOFA circuit and its applications are given.
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Mahmoud et al. (1998) studied this question.
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