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This paper presents performance improvement techniques for VCO-based OTAs (VCO-OTAs). An on-off charge pump(CP) topology is used as an alternative to power-hungry current-steering charge pump used in earlier VCO-OTAs. This brings down the power consumption of the CP and also the phase frequency detector (PFD) used in VCO-OTAs. The paper also presents the use of inherent low pass filtering in VCO-OTAs...
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