A novel high frequency synthesizer using adaptive injection mode-coupled VCSO for low jitter and low noise applications

Injection mode-coupled voltage-controlled SAW oscillators (VCSOs) are versatile performers in low-noise frequency synthesizers, both as high-frequency sources and as reference oscillators. A novel high frequency digital synthesizer is reported with the intent of lowering following: size, cost, power-consumption, phase noise, jitter, and vibration sensitivity. The measured phase noise is typically better than -100 dBc/Hz, -115 dBc/Hz, -129 dBc/Hz, -133 dBc/Hz at 100 Hz, 1 kHz, 10 kHz, and 100 kHz offset frequencies respectively from the carrier frequency of 5200 MHz. The reported synthesizer can generate frequencies from 5 GHz to 5.3 GHz in steps of 100 kHz with typical spurious of -65 dBc and the power consumption is less than 300 mill watt for a given 5 dBm output power.