Novel Low-Power High-dB Range CMOS Pseudo-Exponential Cells

ETRI Journal

关键词: low-voltage;    pseudo-exponential circuits;    VGA;   

Others  :  1185325
DOI  :  10.4218/etrij.06.0106.0121

【 摘 要 】

In this paper, novel CMOS pseudo-exponential circuits operating in a class-AB mode are presented. The pseudo-exponential 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.

   

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