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This paper presents the design of a two-stage wide dynamic range variable gain amplifier (VGA). This is based on a new approximated exponential equation which offers a wide decibel linear range and an improved fully differential MOS Cherry-Hooper topology. In addition, the bandwidth of the VGA has been extended by using the capacitive neutralization technique for wide-band applications. Simulation...
In this paper, a new distributed active mixer is presented. The scheme is based on the conventional Gilbert-cell multiplier with complementary transconductance stage. By adding the preamplifier and non-uniform artificial transmission lines on the topology, the new distributed active mixer is obtained. Comparison of the new mixer with the topology in absence of preamplifier shows that it has higher...
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