Bonfring International Journal of Man Machine Interface

Online ISSN: 2277-5064 | Print ISSN: 2250-1061 | Frequency: 4 Issues/Year

Impact Factor: 0.325 | International Scientific Indexing(ISI) calculate based on International Citation Report(ICR)

An Enhanced SAR Controller for a PLL with Supply Sensitivity Suppression

N. Krishnapriya and C.S. Manikandababu

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Abstract:

An improved SAR (Successive Approximation Register) controller is proposed to overcome the problem of dead lock in a digital calibration technique which suppresses the supply voltage sensitivity of a phase-locked loop (PLL) to achieve a fast fine lock-in. In order to reduce the supply-induced jitter, the voltage-controlled ring oscillator is designed to embed an opposite-supply-sensitivity pair which overcomes the process variations by searching the optimum code. The calibration loop is turned off once the calibration is completed and hence this method consumes much less power. The proposed SAR controller consumes less timing delay of 11.436ns which enhances the speed of the system compared with the conventional method.

Keywords: Successive Approximation Register (SAR), Digital Calibration, Phase-Locked Loop (PLL), Voltage Controlled Oscillator (VCO), Supply Voltage Sensitivity

Volume: 2 | Issue: Special Issue on Communication Technology Interventions for Rural and Social Development

Pages: 13-16

Issue Date: February , 2012