A frequency reference generator includes ( i ) an integrated frequency source having drive circuitry that drives a reso nant ( e.g. , non - trimmable LC ) tank to generate an oscillator signal , ( ii ) at least one temperature sensor that generates at least one measured temperature signal , and ( iii ) a frequency adjustment circuit that adjusts the oscillator signal frequency to generate the frequency reference based on the measured temperature signal and a ( e.g. , sample - specific ) mapping from temperature to a corresponding frequency - adjustment parameter ( e.g. , a divisor value for a fractional frequency divider ) . In some embodiments , a Colpitts oscillator gener ates the oscillator signal based on the measured temperature signal , where the Colpitts oscillator has voltage / tempera ture - compensation circuitry that compensates for variations in power supply voltage and operating temperature . Such frequency reference generators achieve substantial PVT insensitivity with as little as a single 1T - trim or even no trim at all .
|Patent number||US 11,018,625 B1|
|Publication status||Published - 25 May 2021|