Injection locked frequency dividers
You did not specify the frequency accuracy required and phase noise, but LC clocks will have a Q of 100 or so and poor capture range and phase noise, and a cheap 50MHz Xtal or whatever oscillator PLL VCO prescaler fractional N divider will have a Q of 10,000 with low phase noise and 50 ppm frequency error. typ. but phase noise is multiply by divider ratio up to loop bandwidth. If you need widetemp range, then thermal VCXO can be done with varicap and lookup table with known xtal profile. I've developed 1 PPM synth for Tx @ 1GHz using a 25 cent Xtal, quick thermal 30 second test, and test jig for varicap. for circuit -40~+70'C range. 1PPM VCXO using part of HC05 code for VCXO compensation table