A NOVEL INJECTION-LOCKED OSCILLATOR MMIC WITH COMBINED ULTRAWIDE-BANDACTIVE COMBINER DIVIDER AND AMPLIFIERS/

A subharmonically injection-locked oscillator (ILO) MMIC for local osc illators, synthesizers, and phased-array antennas is proposed. An ultr awide-band four-port active combiner/divider in the oscillator feedbac k loop provides an FET-oriented circuit topology extremely suitable fo r single-chip integration, and performs subharmonic injection locking at various subharmonic factors, 1/n. Two types of ILO MMIC's were cons tructed. One of them exhibits a locking range as wide as 1 GHz at n = 1, and the other operates at n from 1 to 16, with an output power larg er than 5 dBm. The proposed ILO MMIC is promising for applications suc h as microwave and millimeter-wave synthesizers, large-aperture phased array antennas, frequency-selective FM-receivers, and so on.