High CMRR and wideband current-mode instrumentation amplifier using fully differential operational floating conveyor

This paper presents a current-mode instrumentation amplifier (CMIA) based on the fully differential operational floating conveyor (FD-OFC). The FD-OFC, as a novel general purpose building block introduced by the authors, has the advantages of fully differential signal processing like higher design flexibility and higher noise rejection. The proposed CMIA provides wide bandwidth reaches 975 MHz and high CMRR exceeds 240 dB. The simplicity of the design is one of its advantages where only one FD-OFC is required and it can operate under biasing condition as low as 1.2 Volt. The operating conditions recommend the proposed CMIA to be integrated to wide range of low power high speed application, particularly when a high CMRR is required. The terminal behavior of the proposed design is mathematically modeled and its operation is simulated using the UMC 130 nm technology kit in Cadence environment.