Performance characteristics of a 10 MHz VCO with a dual BVA resonator

The results of tests performed on two experimental 10 MHz voltage controlled oscillators (VCOs) utilizing dual BVA resonators specifically designed for low acceleration sensitivity are reported. Dynamic acceleration testing was performed with the VCOs in the phase noise test configuration with the exception that the test oscillator was subjected to controlled vibration to measure acceleration sensitivity. Magnetic field susceptibility tests were made with the test device in the same configuration. The test oscillator was placed inside an AC Helmholtz coil where the magnetic field magnitude and frequency were varied. Short term stability as well as oscillator aging tests were performed with the VCOs under controlled temperature, relative humidity, and pressure. Temperature, humidity, and pressure were cycled one at a time with the other two parameters fixed to observe the effects on the VCO frequency. Test results indicate that the experimental VCOs have acceleration sensitivities which are an order of magnitude lower than those of previously used VCOs