A low noise Ku-band SiGe phase locked oscillator

A fully integrated 13.3-15.3 GHz Phase Locked Oscillator (PLO) has been developed using an 80 GHz f(T) SiGe HBT technology. The PLO consists of a Push-Push VCO, buffers, frequency doubler, 32/64 dual modulus prescaler, a Phase frequency detector (PFD) with lock detect, and an Operational amplifier. The output power at 15 GHz is 7dBm. The VCO has a respectable phase noise of -96 dBc/Hz at 100KHz offset. The prescaler has an excellent phase noise floor of -162 dBc/Hz at 113 MHz. The noise floor of the PLO is -104 dBc/Hz at 1KHz offset and -110 dBc/Hz at 1MHz offset at a reference frequency of 113 MHz. The PLO has very linear, nearly flat, tuning sensitivity of 650-750 MHz/V across the band.