BAW(Bulk Acoustic Wave) resonator with high Q-factor.

bulk acoustic wave (BAW) resonator with high Q-factor.

Docs:

1. Frequency Synthesis for a Low-Power 2.4 GHz Receiver Using a BAW Oscillator and a Relaxation Oscillator, Christian Enz, 2007, Conference paper
2. Integrated BAW-Based Frequency References - Springer

Texas Instruments:

1. Standalone BAW Oscillators Advantages Over Quartz Oscillators
2. Oscillators, Utilize the benefits of BAW (bulk acoustic wave) technology in our BAW oscillators
3. BAW select by feature
   Fixed oscillators
   Featuring standard frequencies or factory-programmable for any frequency, standard output formats, typical 156.25 MHz RMS jitter of 90 fs (12 kHz to 20 MHz), stability of ±25 ppm, ±50 ppm
   Find your device::
   https://www.ti.com/clocks-timing/oscillators/products.html#p2192=Fixed frequency
   Programmable oscillators
   Featuring pin-mode and I2C-programmable mode for output frequency and format, typical 156.25 MHz RMS jitter of 90 fs (12 KHz to 20 MHz) and stability of ±25 ppm, ±50 ppm
   Find your device:
   https://www.ti.com/clocks-timing/oscillators/products.html#p2192=Programmable frequency