This paper presents a wideband low-phase-noise voltage-controlled oscillator (VCO) implemented in a 22 nm CMOS advanced process for high-performance frequency synthesis systems requiring both wide tuning range and low phase noise. The proposed VCO adopts a complementary cross-coupled topology and incorporates a transformer-coupled common-mode noise-suppression network at the sources, which establishes a high impedance at the second harmonic to suppress flicker-noise upconversion and improve oscillation waveform symmetry. In addition, a 3-bit programmable source capacitance is introduced for adaptive phase-noise optimization. To alleviate the inherent tradeoff between wide frequency coverage and low VCO gain, a hybrid tuning scheme combining 10-bit switched-capacitor coarse tuning with varactor-based fine tuning is employed. Operating from a 1.2 Vsupply, the proposed VCO consumes 3.35 mW and occupies an area of 0.185 mm². It achieves a continuous tuning range of 6.07–8.50 GHz and exhibits a phase noise of −122.1 to −120.6 dBc/Hz at a 1-MHz offset frequency.