Low-voltage BD-FC-OTA based-DO-CCII and its Applications for Low-Frequency Signal Processing

This paper presents a positive and negative both of second-generation current conveyor (DO-CCII) cell as a single circuit. The input core of this cell has utilized an adaptively biased bulk-driven pMOS input pair and folded cascode load based OTA. This OTA section has ensured GBW, PM and CMRR of 13.7 kHz, 86.5 degree and 113 dB, respectively with a 15 pF load capacitor and a ± 0.25 V bias supply. The OTA section provided a wide input common mode range, wide output signal swing with good linearity. The output section of DO-CCII cell uses two CMOS inverter to yield its X and Z+ terminals whereas its Z− terminal is generated by using cross coupled low-voltage current mirrors. The DO-CCII cell has provided wide voltage and current DC sweep range with very good linearity. When measured between the frequency ranges of 1 Hz to 100 kHz, the voltage gain and current gains are found to be close to unity. The designed DO-CCII cells have been utilized in design of current mode SIMO filter, oscillator and variable gain current mode instrumentation amplifier (CMIA) which confirms its usability in small frequency bio-signal processing applications. These circuits have been simulated in 180 nm CMOS bulk process technology using Tanner EDA tool of version 16.1.