86 dB 1.4mW 1.8V 0.07 mm2 single-stage variable gain amplifier in 0.18 μm CMOS

A simple single-stage variable gain amplifier that offers 86 dB of gain variation, consumes 1.4 mW, and occupies 0.07 mm 2 is introduced and shown to have the largest gain range. lowest power, and smallest chip size ever reported based on 0.18 μm CMOS technology. A new approximated exponential equation is proposed, which offers the largest dB-linear range compared to all previously-reported approximated equations.