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We propose the concept of AC-coupled LC tank for minimizing VCO pushing, as well as to enable multi-terminal tuning of the varactors, in the widely used cross-coupled CMOS VCOs. The proposed concept is demonstrated with a mmWave VCO (40GHz) in a foundry-based 65nm bulk CMOS. Measured data demonstrates >3× lower pushing while achieving 16% wider tuning range (7.2GHz versus 6.1GHz) compared to a...
A millimeter-wave hyperabrupt-junction varactor (HAVAR) enabling 77 GHz VCO/TX with 13-15 GHz tuning range and better than -70 dBc/Hz phase noise at 100 kHz offset has been integrated in SiGe:C BiCMOS for automotive radar products. The HAVAR predominantly uses existing processes for low-cost integration and minimal process complexity. Optimization of TR-Q thru HAVAR width allows TR up to 2.7 and Q...
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