Abstract
Model based optimization of a novel integrated interface circuit topology is presented for low voltage DC-DC step-up conversion. A cross-coupled charge pump is implemented in standard 0.18µm CMOS technology using an integrated LC tank oscillator to enable a compact, low cost, self-starting solution with maximum efficiency at ultra-low input voltage levels available from embedded micro-power generators. The voltage doubling oscillator can start up with input as low as 0.10V. Full system can step 0.2V up to 1.7V to supply >400μW to 6kΩ load with 46.5% efficiency based on post-layout simulations. The minimum simulated input voltage is 0.11V, which is boosted up to 1.0V under open circuit conditions. The optimized system thorough the established model improves output power and efficiency more than 30% compared to the alternatives. The compact LC tank leads to 17% area reduction compared to the conventional VCO with four planar inductors.
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