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A CMOS dB-linear RF variable gain amplifier (VGA) that can provide a variable gain of 25-dB is implemented. The 25-dB of this range is achieved by a dB-linear V-I converter, which includes current limiting circuitry to reduce the gain variation due to process and temperature at maximum and minimum output power levels. The circuits are designed in a 0.13-um RF CMOS process. The measurement results...
This paper describes a prototype micropower instrumentation amplifier intended for chronic sensing of neural field potentials (NFPs). NFPs represent the ensemble activity of thousands of neurons and code-useful information for both normal activity and disease states. NFPs are small - of the order of tens of muV- and reside at low bandwidths that make them susceptible to excess noise. Therefore, to...
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