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This paper presents a compact, fully-differential instrumentation amplifier with nearly rail-to-rail input common mode range. The amplifier, which is based on an original topology, embodies chopper modulation for offset and flicker noise reduction. The paper describes the experimental results obtained with a prototype designed with the UMC 0.18 μm MM/RF CMOS process. The amplifier draws 42 μA at a supply voltage of 1.8 V with an input noise voltage density of 75 nV/sqrt(Hz). Total amplifier area is 0.056 mm2

This paper presents a fully-differential instrumentation amplifier, designed for low voltage, integrated impedance spectroscopy systems. The proposed architecture combines relative simplicity with an almost rail-to-rail input range. A synchronous demodulator is embedded into the output stage. These characteristics make it suitable for AC current sensing applications. A prototype has been designed using the UMC 0.18um MM/RF CMOS process. Simulations performed with a supply voltage of 1.5 V, showed that a maximum relative error of nearly 1 % can be achieved for stimulation frequencies up to 1 MHz and with a DC input common-mode voltage variable across a nearly 1 V interval. Power consumption is 150 uW

A new architecture for differential bandgap voltage references is presented. The system is based on a switched capacitor amplifier that performs correlated double sampling to cancel offset and reduce flicker noise while maintaining a valid output voltage throughout the clock cycle. The circuit noise is filtered by an intrinsic discrete time low-pass function with tunable cut-off frequency. A prototype designed with 0.18 um CMOS process is described. Preliminary performances are estimated by means of periodic noise analysis carried out with the SpectreRF simulator