A broadband 1.35THz GBP 120-mW common-collector feedback amplifier in SiGe technology

This paper presents a broadband amplifier with 32.5 dB gain and a 3-dB bandwidth of 31.4 GHz. The amplifier exhibits a relatively flat gain response, as well as flat group delay over the full operational bandwidth. The circuit consists of two differential stages employing a novel feedback that is responsible for the bandwidth expansion with negligible increase in area and power consumption. The amplifier consumes 120mW from a 2.2V supply and shows a gain-bandwidth product (GBP) of more than 1.35 THz, which is the first to achieve such a high GBP for a very low power consumption.