IEEE Journal of Solid-State Circuits · 2004 · 31 citations · 4 references
EngineeringElectrical EngineeringAnalog ElectronicsLow-power DesignMicroelectronicsCmos Circuit DesignDynamic Power ReductionOperational AmplifiersPower OptimizationSmall-signal AnalysisCmos Analog Circuit DesignCmos Analog Integrated CircuitsCmos Operational AmplifiersLow-power Cmos DesignLow-power Operational AmplifiersPower ConsumptionPower Reduction TechniquesSlew Rate
A novel power reduction technique is proposed for a switched-capacitor amplifier (SCA) with two-stage operational amplifier. This technique improves both the bandwidth and the slew rate of the SCA with only two additional switches, and therefore, the power consumption of the SCA is reduced. This power reduction technique is applied to a variable gain amplifier (VGA) which is implemented in an analog front-end of camera modules for cellular phones. This reduces 30% of the VGA power consumption compared to the conventional one. Fabricated in 0.25-/spl mu/m CMOS process with 3.3-V transistors and MIM capacitors, the VGA occupies 0.49/spl times/0.49 mm/sup 2/ and dissipates 18.7 mW at 18 MHz with a supply voltage of 3.1 V.
4
A CMOS analog front-end chip-set for mega pixel camcorders
K. Nakamura, S. Decker, D. Kelly et al. · 2002 · 20 citations
Engineering, Computer Engineering, Electrical Engineering +17