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This paper proposes a tail-feedback VCO with adaptive current modulation scheme. The proposed current modulation scheme ensures robust startup conditions for the tail-feedback VCO. The proposed VCO is implemented in a 0.18-µm CMOS process. The measured phase noise is −119.3dBc/Hz at 1MHz offset with a power dissipation of 6.8mW at 4.6GHz.
This paper proposes a low-power current-reuse complementary differential LC-VCO which is composed of a pair of NMOS and PMOS transistors with an adaptive bias scheme for both transistors to ensure its robust startup and achieve maximum swing in Class-C operation. The proposed VCO has been implemented in a standard 0.18μm CMOS technology, which oscillates at the carrier frequency of 4.6 GHz. The measured...
This paper proposes a constant-current-controlled class-C VCO using a self-adjusting replica biasing scheme. The proposed class-C VCO can maintain constant current which is more robust over a variation of low gate bias of a cross-coupled pair comparing to a traditional current mirror. The proposed VCO is implemented in a 0.18-µm CMOS process. The measured phase noise is −121.3dBc/Hz at 1MHz offset...
We propose a feedback class-C voltage-controlled oscillator (VCO) that has robust start-up and a large oscillation amplitude. It initially starts oscillating as a conventional cross-coupled LC-VCO for robust start-up and subsequently transforms automatically into an amplitude-enhanced class-C VCO when it reaches steady-state to give improved noise performance. Detailed analysis of the start-up conditions,...
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