This week, we've been looking at the FiiO K11 R2R DAC and headphone amplifier -- a proper hi-fi bargain if ever I've used one. Here are five more thoughts on it. 1. The digital pre-amplifier inside ...

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In this brief, an inductor-less low-noise amplifier (LNA) that utilizes a noise-canceling technique along with dual-resistor feedback is proposed. The conventional single-resistor feedback structure ...

Bio-signal instrumentation amplifier (Bio-IA) is one of the most important circuit in the vital sign monitoring system. However, the performance of the Bio-IA using traditional pseudoresistor (PR) is ...