We present C-band oscillators with external high4 inductors: wire-bond inductors and embedded inductors in a Mum-Layer Organic (MLO) board fabricated by a thick-film MCM-L technology. The phase-noise performance of oscillators are compared with the oscillator using onship inductors. Inductors are designed to obtain high quality factor In C-band. The phase-noise performauce ofthe oscillator with onsbip Inductors measures -108 dBc/Hz at 600 KHz offset frequency, and that of the oscillator with external inductors shows -113 dBcJHz at the same offset. Using MLO inductors, the phase-noise is better than the oscillator with onship inductors and comparable to the oscillator with wirebond inductors. To our knowledge, this is the first C-band oscillator using inductors embedded in the multi-layer organic packaging technology. This is. also the first report comparing the performance of oscillators using three different inductor technologies: onsbip Integration, wire-bonding, and multi-layer orgauic packaging technology.