Hybrid CMOS-Memristor based operational transconductance amplifier for high frequency applications

This paper deals with designing an optimized hybrid Operational Transconductance Amplifier (OTA) employing a technique called source degeneration with adaptive biasing that can be used for high frequency applications. This work targets implementation of a simple technique with less number of circuit elements which reduces the die area and power consumption and gives rise to good results. The circuit has been designed to operate with a supply voltage of +/- 1 V along with a bias current. The linearity which is the major drawback of the conventional Complementary Metal Oxide Semiconductor (CMOS) OTA gets improved with source degeneration technique using a non-CMOS non-volatile memory (so-called memristor). The gain-bandwidth product gets improved for an 80pF load. A biquad OTA-C filter is designed and implemented utilizing the OTA designed in this work as an application example. The realization of a high pass filter has been demonstrated. All the simulations were carried out in the Cadence (R) Virtuoso environment using 180 nm CMOS technology. Another facet of this paper is the memristor compatibility with the CMOS process technology.

Automated summary

This paper discusses the design of an optimized hybrid OTA using source degeneration and adaptive biasing for high frequency applications. By simplifying the circuit elements to reduce die area and power consumption, good results are achieved; using a memristor improves the linearity of the conventional CMOS OTA.