Abstract: A 37 GHz wide-band programmable divide-by-N frequency divider (FD) composed of a divide-by-2 divider (acting as the first stage) and a divider with a division ratio range of 273–330 (acting as the second stage) has been designed and fabricated using standard 90 nm CMOS technology. The second stage divider consists of a high-speed divide-by-8/9 dual-modulus prescaler, a pulse counter, and a swallow counter. Both the first stage divider (with high speed) and the divide-by-8/9 prescaler employ dynamic current-mode logic (DCML) structure to improve the operating performance. The first stage divider can work from 2 to 40 GHz and the whole divider covers a wide frequency range from 25 to 37 GHz. The input sensitivity is as low as −20 dBm at 32 GHz and the phase noise at 37 GHz is less than −130 dBc/Hz at an offset of 1 MHz. The whole chip dissipates 17.88 mW at a supply voltage of 1.2 V and occupies an area of only 730 μm ×475 μm.

Key words: Wide-band, Divide-by-N, Frequency divider, Dynamic current-mode logic (DCML), Pulse and swallow counters, CMOS

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