Balanced monolithic oscillators at K- and Ka-band

A technique for generating accurate antiphase signals is presented in this paper. Monolithic oscillators at 20 and 40 GHz are realized using this tech nique. These oscillators have dual outputs that are mutually locked in anti phase, The inherent amplitude and phase balances between the output signals are verified. This is achieved by direct measurement using injection-locki ng polar diagrams, as well as low-frequency measurements of the down-conver ted oscillator outputs. The operation of the balanced oscillator as a multi device power-combining oscillator is also investigated. Improvements of pha se noise reduction and frequency stabilization are demonstrated at the comb ined oscillator output. This new oscillator topology shows significant pote ntial in balanced circuits like mixers, multipliers, and modulators where c ircuit performance relies on the precise generation of the balanced signals .