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

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2 Author(s)
Ramirez-Angulo, J. ; Texas Instrum. Inc., Dallas, TX, USA ; Ledesma, F.

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.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:53 ,  Issue: 5 )