A CMOS programmable divider for RF multistandard frequency synthesizers

A flexible CMOS divider for RF frequency synthesizers is presented. It is based on a dual modulus prescaler and two programmable asynchronous counters. The divider, together with a test 1.9 GHz synthesizer, has been fabricated in a 0.35 µm technology and works with 2 V supply. The divider consumes 3.35 mA at 1.9 GHz input frequency and the division ratio can be varied between 98 and 4608. The current consumption can be adjusted for lower frequency operation.