Historically as YIG oscillators move up in frequency towards 20 GHz the active device had to be changed from a bipolar transistor to Field Effect Transistor, (FET). This typically degrades phase noise performance by 10 to 15dB. Teledyne Microwave’s new series of YIG oscillators extend state of the art bipolar type low phase noise performance all the way up to the 20 GHz frequency range. An example is the FS2637 which is housed in a 1.25” x 1.25” x 0.94” package, (see figure 2B). This device has a typical 100 KHz offset phase noise of -128dBc/Hz across the entire 8 to 18 GHz frequency range. (Maximum phase noise is -123dBc/Hz, see figure 3 for details) These same phase noise specifications are also guaranteed for the FS2678 which covers the 12 to 20 GHz frequency band.

YIG oscillators typically require a main coil for coarse tuning and a FM coil for phase locking. When phase locking is required it is important that the bandwidth of the FM coil be several times greater than the phase lock loop bandwidth. The FS2692 has a minimum FM coil modulation bandwidth of 2 MHz, (see figure 4 for details). This 1” x 1” x 0.7” (see figure 2C and 2D) oscillator has a maximum 100 KHz offset phase noise of -125dBc/Hz across the entire 6 to 13 GHz frequency band.

For pdf catalog: YIG Oscillator Products