A Novel design of high precision and adjustable current source used for Operational Transconductance Amplifier in 0.35µm AMS technology

Current source is one of the basic building blocks of analog VLSI systems. Here we design a novel structure of current source in AMS 0.35 μm technology. T-Spice simulation results confirm the high precision of the proposed circuit. In fact, we achieved a maximum error of 0.5%, a high large band of linearity between -1.1V and 0 V. In addition our new circuit allowed us a low input impedance of 961Ω and a high output A B impedance of 0.18 MΩ. Eventually we have also succeeded in obtaining a gain band width (GBW) equal to 80MHz and 60 dB gain (Av) at ±1.5V supply voltage.