Abstract
This paper presents a low-voltage low-power differential programmable gain amplifier (PGA) for wideband applications. The proposed cell is based on a g/sub m/-boosted source degenerated differential pair with a hybrid polysilicon-MOS resistor degeneration structure. Fabricated in a 0.35 /spl mu/m CMOS technology, the PGA consumes less than 0.5 mW at a single 1.8 V supply. Measured results for a 3-bit implementation show a 0 to 18 dB linear-in-dB programmable gain with a constant bandwidth of 100 MHz when driving 150 fF capacitive loads. Distortion levels are below -72 dB over the whole gain range at 10 MHz for a 0.2 V/sub p-p/ differential output.
Published Version
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