The universal opamp and applications in continuous-time resistorless and capacitorless linear weighted voltage addition

摘要

A versatile analog building block denoted the universal operational amplifier (opamp) is introduced. The circuit is a generalized version of the fully differential difference opamp with 2n weighted differential inputs. Applications in resistorless and capacitorless continuous-time linear weighted voltage addition are discussed. Experimental results of a test chip prototype are shown that validate the proposed approach. Simulations show potential for high frequency operation of the circuit with gain-bandwidth close to 140 MHz in 0.5-μm CMOS technology.