Abstract
State-of-the-art logarithmic amplifiers use a transimpedance technique based on the exponential dependence between input current and output voltage as exhibited by p-n junction diodes, bipolar transistors and MOS transistors in the subthreshold region. Presented is a CMOS current-input current-output logarithmic amplifier based on a translinear Ohm's law principle which involves a floating voltage source and a passive resistor embedded within a translinear loop. It is demonstrated that the input-output range of the proposed logarithmic amplifier can be controlled using a reference bias and the response of the amplifier can be temperature compensated using a PTAT and a resistive cancellation technique.
Original language | English |
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Pages (from-to) | 433-434 |
Number of pages | 2 |
Journal | Electronics Letters |
Volume | 47 |
Issue number | 7 |
DOIs | |
State | Published - Mar 31 2011 |