By Bjørnar Hernes
Broadband opamps for multi-channel conversation structures have powerful calls for on linearity functionality. while 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 offer voltage to keep up the signal-to-noise-ratio. to procure opamps with low distortion it is 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 huge factor and is addressed during this paintings. it is very important bias the transistor such that the distortion is low and sturdy within the complete variety of its terminal voltages. it will be certain excessive linearity and robustness opposed to adaptations in circuit stipulations reminiscent of energy provide voltage, bias present and strategy diversifications.
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Extra info for Design Criteria for Low Distortion in Feedback Opamp Circuits
R. Kinget, W. Sansen, “High-Frequency Distortion        Analysis of Analog Integrated Circuits,” IEEE Tr. on Circuits and Systems—II: Analog and Digital Signal Processing, vol. 46, no. 3, pp. 335-345, Mar. 1999. S. Narayanan, “Transistor Distortion Analysis Using Volterra Series Representation,” The Bell System Technical Journal, vol. 46, pp. 991-1024, May-June 1967. S. Narayanan, H. C. Poon, “An Analysis of Distortion in Bipolar Transistors Using Integral Charge Control Model and Volterra Series,” IEEE Transaction on Circuit Theory, vol.
The desired nonlinear response is the harmonic, which is expressed in (2-26). When (2-26) is compared to (2-23) it shows that (2-26) corresponds to the first term of (2-23), except for the factor ½. This factor is due to the phasor representation . If the order intermodulation product is to be found, it will correspond to the second term in (2-23). The nonlinear transfer functions, obtained by the phasor method, are thus a subset of the Volterra series. The phasor method provides less complex derivations and expressions at the cost of generality.
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.