(a) Calculate the random input offset voltage for the op amp in Fig. 6.16. Assume the matching...
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(b) Repeat (a) for an op amp that uses an n-channel differential pair and a p-channel current-mirror load.
(c) Which of these two configurations gives lower input offset voltage? Explain
Figure 6.16
Table 2.4
Transcribed Image Text:
+Vcc ŹR12 To output stage RL1 R11 Q4 Q3 Q2 Q1 -VEE Value Value n-Channel p-Channel Parameter Symbol Transistor Transistor Units Substrate doping NA, ND 5 x 105 4 x 1016 Atoms/cm Gate oxide thickness lox 80 80 -0.1 150 Metal-silicon work function Фия -0.6 cm?/V-s Channel mobility Minimum drawn channel length Source, drain junction depth Source, drain side diffusion Overlap capacitance per unit gate 450 Larwn 0.4 0.4 um X} La Cd 0.15 0.18 um 0.09 0.09 um 0.35 0.35 fF/um width Threshold adjust implant (box dist) impurity type effective depth effective surface х, 0.16 0.16 pm 4 x 1016 3 x 1016 Atoms/cm concentration Nominal threshold voltage Polysilicon gate doping concentration V, Napoly 0.6 100 -0.8 100 Atoms/cm R, Poly gate sheet resistance Source, drain-bulk junction Cp 0.2 0.4 fF/um? capacitances (zero bias) Source, drain-bulk junction capacitance grading coefficient 0.5 0.4 Source, drain periphery capacitance (zero bias) Source, drain periphery 1.2 2.4 fF/um 0.4 0.3 capacitance grading coefficient Source, drain junction built-in potential 0.7 0.7 Os Surface-state density 10" 10" Atoms/cm dх Channel-length modulation 0.02 0.04 um/V dVps parameter
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Related Book For
Analysis and Design of Analog Integrated Circuits
ISBN: 978-0470245996
5th edition
Authors: Paul R. Gray, Paul J. Hurst Stephen H. Lewis, Robert G. Meyer
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