800MHz voltage-controlled oscillator with 6dB phase-noise tuning range

An 800MHz adaptive voltage-con trolled oscillator is designed for a maximal phase-noise tuning range of 6dB with a factor three saving in power consumption. Operating from a 3V supply, it achieves better than -136dBc/Hz phase noise at 10MHz offset from the 800MHz oscillating frequency at a current consumption level of 5mA, and phase noise of -130dBc/Hz at 10MHz offset from the 800MHz oscillating frequency at a current consumption level of 1.7mA. For a 3V tuning voltage, a frequency tuning range of 120MHz, from 715MHz and 835MHz, is achieved.