Synthesis of CMOS OTA based communication circuit

In this paper, a generalized design methodology for operational transconductance amplifier (OTA) based current mode radio frequency (RF) communication circuit is proposed. Three novel communication circuits, phase lock loop (PLL), adaptive delta modulator (ADM) and data compressor have been simulated. In the first implementation, direct frequency modulation is used to realize PLL, while the second gives coded pulse modulation system, which employs sampling, quantizing and coding to convert analog waveforms into digital signals. Finally, the third circuit implements data compression in digital communication system. Performance of the circuits realized with OTAs has been demonstrated through SPICE simulation.