Download Design Criteria for Low Distortion in Feedback Opamp by Bjørnar Hernes PDF
By Bjørnar Hernes
Broadband opamps for multi-channel communique structures have robust calls for on linearity functionality. whilst those opamps are built-in in deep sub-micron CMOS applied sciences, the signal-swing has to occupy a wide a part of the particularly low provide voltage to take care of the signal-to-noise-ratio. to acquire opamps with low distortion it's important to do an intensive research of the nonlinear behaviour of such circuits and this can be the most topic of layout standards for Low Distortion in suggestions Opamp Circuits.The biasing of every transistor within the circuit is a big factor and is addressed during this paintings. you will need to bias the transistor such that the distortion is low and reliable within the whole variety of its terminal voltages. this can make certain excessive linearity and robustness opposed to diversifications in circuit stipulations similar to strength offer voltage, bias present and procedure diversifications.
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Extra info for Design Criteria for Low Distortion in Feedback Opamp Circuits
To ensure weakly nonlinear behavior also at high frequencies, the bias current must be large enough to keep the circuit far from slewing behavior in any of its nodes, at the highest operating frequency.
On the other hand, high GS-voltage, and thus high GS-overdrive, will make the saturation voltage high and increase the nonlinear coefficients associated with the DSterminal. This is the same situation as for the current source described in the previous subsection. 8V to keep all nonlinear coefficients small and the total distortion from the transistor on a minimum. The other nonlinear coefficients in (3-4) depend on both and Simulations show that these coefficients are low and relatively constant with the same biasing scheme as above.
From the intercept points it is possible to compute the distortion at the output of the circuit for a given excitation level on the input. Further, two tools for symbolic analysis of weakly nonlinear systems were described. The Volterra series is general, but complex. By the phasor method is it possible to find only the desired nonlinear responses. This results in simple derivations and less complex symbolic expressions. Further in this book, the phasor method will be used for nonlinear analysis.