In one aspect, a voltage controlled oscillator is provided that includes circuitry comprising tunable coupled resonator networks, which are coupled to a terminal of a pair of three-terminal devices through a tuning voltage network which supports wide-band tunability. In another aspect, a wide-band tunable...http://www.google.se/patents/US20050156675?utm_source=gb-gplus-sharePatent US20050156675 - Integrated low noise microwave wideband push-push VCO
