The thesis focuses on the design of a fully differential operational transconductance amplifier (OTA) intended for use in a gigabit Ethernet transmitter. The amplifier must meet stringent requirements in terms of gain, stability, and bandwidth. A two-stage topology is proposed, consisting of a telescopic input stage and an inverting output stage. For determining the ratios between currents and transistor dimensions, as well as to define the V* values of individual branches, the gm/I_d methodology will be employed. Following the design calculations, the circuit will be simulated using Cadence simulation environment with standard test configurations. By combining analytical and simulation-based approaches, the thesis aims to provide a thorough understanding of how individual design parameters affect amplifier performance — an essential aspect in the development of analog components for high-performance communication systems.
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