Abstract
One of the origins of harmonic distortion in current mirrors is
the inevitable mismatch between the mirror transistors. In this
brief we examine both single current mirrors and complementary
class AB current mirrors and develop analytical expressions for
the mismatch induced harmonic distortion. The expressions are
verified through simulations and are used for a discussion of the
impact of mismatch on harmonic distortion properties of CMOS
current mirrors. The distortion model is combined with well known
statistical models for the device mismatch in order to establish a
relation between geometrical parameters, distortion and production
yield. It is found that distortion levels somewhat below 1% can be
attained by carefully matching the mirror transistors but ultra
low distortion is not achievable.
Original language | English |
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Journal | IEEE transactions on circuits and systems - 2, Analog and digital signal processing |
Volume | 46 |
Issue number | 7 |
Pages (from-to) | 937-941 |
ISSN | 1057-7130 |
Publication status | Published - 1999 |