current mode instrumentation amplifier with rail-to-rail input and output
A Current Mode Instrumentation Amplifier with rail-to-rail input and output is presented. It is based on constant gm input stages, and cascode output stages. Although this CMIA structure has a good Input Common Mode Voltage, it suffers from a poor output swing, due to the limitation imposed by the current mirrors. This problem is overcome by using a transconductance amplifier as output block. The circuit was designed to 0.6m XC06 XFAB CMOS technology. Post layout simulations on the extracted circuit net-list provide a bandwidth about 70 kHz (-3dB), and a CMRR higher than 160dB, for a dc gain set to 66 dB. The power consumption is 149W at 1.5V.
current mode instrumentation amplifier rail-to-rail input and output analog integrated circuits