Design and simulation of high-swing fully differential telescopic Op-Amp

This article describes the process of design and simulation of a high-swing fully differential telescopic Operational Amplifier (Op-Amp). Due to the Common Gate-Common Source (CG and CS) cascode structure, the gain is very high. To maximize this gain, the load must also be selected such as two current sources. This circuit has the higher voltage in output than current Op-Amps in accordance with desirable characteristics. The loss of power of this operating amplifier are very low and in milliwatts. With use of a power supply of 1.8 V, it achieves a high-swing 1.2 V, a differential gain of 76.333 dB, ω_uGB of 412 MHz, and 50 dB CMRR. This new design through the simulations and analytically shows that the high-swing fully differential telescopic Op-Amp retains its high CMRR even at high frequencies.

Reconfigurable Balanced Dualband Bandstop Filter

This paper introduces a novel architecture of reconfigurable balanced (differential) dualband bandstop filter (BSF). In differential mode (DM), each symmetrical bisection of the filter incorporates in-series cascade of two tunable dualband bandstop sections whereas high CMRR is achieved by loading open stubs to the symmetry plane of the branch line structure. To validate the proposed topology, a microstrip prototype is designed and fabricated. Both simulation and measured results show a good agreement with each other.