Un Amplificador Operacional Balanceado
(A Fully-Balanced Operational Amplifier)
Enrique Mario Spinelli (firstname.lastname@example.org), Miguel Angel Mayosky (email@example.com)
Universidad Nacional de La Plata
This paper appears in: Revista IEEE América Latina
Publication Date: Dec. 2007
Volume: 5, Issue: 8
A method for analysis and design of Fully-Differential (F-D) analog circuits is presented. It is based on defining a Fully-Balanced Operational Amplifier (FBOA), which works with balanced signals; this is with common mode and differential mode voltages as a whole, allowing analysis and design of both operational modes behaviors.
The FBOA can be implemented as a monolithic circuit but it can also be easily built using standard single-ended (S-E) operational amplifiers. This structure can be found in many typical F-D feedback circuits, providing a new framework for their analysis. The proposed device also provides a simple way to design F-D circuits and allows the implementation of inverter and non-inverter F-D topologies.
Typical application circuits are analyzed and, as a design example, a "double-mode oscillator (a circuit that has independent common mode and differential mode oscillations) is presented. Experimental tests performed on this circuit validate the proposed technique.
Differential amplifiers, Operational Amplifiers, Analog Circuits.
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