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Improved dynamic range, digitally-controlled linear-in-dB CMOS variable gain amplifier | IEEE Conference Publication | IEEE Xplore

Improved dynamic range, digitally-controlled linear-in-dB CMOS variable gain amplifier


Abstract:

A new digitally-controlled exponential variable gain amplifier is presented in this paper. This circuit is based on the proposed novel method of expanding the dynamic ran...Show More

Abstract:

A new digitally-controlled exponential variable gain amplifier is presented in this paper. This circuit is based on the proposed novel method of expanding the dynamic range over which a traditional approximate function estimates the ideal exponential function. The technique is unique in a way that it culminates in a true exponential amplifier over an improved input dynamic range. Tuning in this circuit has been achieved using a single digitally switched variable resistor. Finally, the circuit has been implemented in a TSMC 0.18 μm CMOS technology and displays a gain from about - 21 dB to 36 dB in steps of 3.89 dB with a linear error in [-0.66 dB, 0.45 dB].
Date of Conference: 15-18 May 2011
Date Added to IEEE Xplore: 04 July 2011
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Conference Location: Rio de Janeiro, Brazil

References

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