Low voltage class AB current differencing buffered amplifier (CDBA)

This paper presents a low voltage class AB current differencing buffered amplifier (CDBA). The circuit is developed based on two low voltage current mirrors and voltage follower. In the design, dynamic threshold voltage MOSFET (DTMOS) is employed as core devices. The proposed circuit is designed using a 0.13 µm CMOS technology and can operate under the supply voltage of 0.7 V. The simulation results show the impedance at ports p, n, z and w of 16.89 Ω, 15.99 Ω, 102.4 kΩ, and 15.56 Ω, respectively. The current transfer ratio iz/ip, iz/in and voltage transfer ratio vw/vz are found to be close to one (iz/ip=0.998, iz/in=0.996 and vw/vz=0.995) with the bandwidths of 460 MHz, 522 MHz and 172 MHz, respectively.