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Novel Low-Power High-dB Range CMOS Pseudo-Exponential Cells
Carlos Aristoteles De La Cruz Blas,Antonio Lopez-Martin 한국전자통신연구원 2006 ETRI Journal Vol.28 No.6
In this paper, novel CMOS pseudo-exponential circuits operating in a class-AB mode are presented. The pseudoexponential approximation employed is based on second order equations. Such terms are derived in a straightforward way from the inherent nonlinear currents of class-AB transconductors. The cells are appropriate to be integrated in portable equipment due to their compactness and very low power consumption. Measurement results from a fabricated prototype in a 0.5 μm technology reveal a range of 45 dB with errors lower than ±0.5 dB, a power consumption of 100 μW, and an area of 0.01 mm2.