WEMA4: ADF4382 Fast Calibration Feature

Presentation Abstract
In many phase-locked loop frequency generation applications, reducing lock time between frequencies is of critical importance. The ADF4382 uses a dual-core, multi-band VCO architecture that enables a wide octave frequency range from 11 GHz to 22 GHz. The default method for frequency selection uses an auto-calibration routine to select the appropriate VCO core and band internally, which typically takes 100μs. This presentation details the innovative FastCal feature which uses an on-chip Look-up table approach, allowing users to bypass the autocalibration routine. Thereby reducing time taken to lock from one frequency to another, to effectively just loop filter settling time.