A high CMRR low power fully differential Current Buffer

Abstract

Abstract:In this paper a low power fully differential current buffer is introduced which performs high CMRR exploiting a novel method to alleviate common mode gain. The proposed current buffer is designed and simulated with HSPICE in 0.18 μm CMOS process and supply voltage of ±0.75 V. The simulation results show an 8.48 Ω input resistance, 98 dB CMRR, 369 MHz bandwidth and power dissipation of 135 μW. The corner case simulation has been done which shows an acceptable performance for the proposed buffer in all situations. The proposed circuit tends to be the fundamental block of a new family of electronic differential topologies greatly capable to be much further improved and utilized.

A cryogenic low power CMOS analog buffer at 4.2K

“…It can be used as a voltage buffer between different unit circuits or to detect the voltage value of an internal node without affecting the operation of the internal circuit. [3,4,5,6,7,8,9,10,11,12] Similarly, the quantum controller circuits need voltage buffer to drive large capacitive load and track the voltage level. Moreover, this buffer needs to meet some particular criteria like high slew-rate, operating in liquid helium dewar and consuming extremely low power because of the limitation of refrigerator power.…”

A novel ±0.5 V, high current drive, and rail to rail current operational amplifier

“…In a mixed mode design the analog part must be robust against the interferences introduced from the adjacent digital part [5,38]. These interferences appear as common mode signals at analog circuit inputs and experience the same process as the real input signal which consequently degrades the resulted output.…”

“…These interferences appear as common mode signals at analog circuit inputs and experience the same process as the real input signal which consequently degrades the resulted output. In order to make the analog part insensitive to interferences of the digital part differential processing of the signals is preferred which high common mode and power supply rejection ratio (CMRR and PSRR) are their most important inherent characteristics [5,38]. As a result, in these applications differential COAs are preferred compared to the single input-single output ones.…”