Abstract
A wide locking range CMOS LC-tank injection locked frequency divider (ILFD) is proposed and it uses a pre-amplifier stage in series with a post-injection mixer. The injection signal is fed to a pre-amplifier to enhance the injection signal at the post-mixer gate in the divide-by-2 ILFD. The gate of mixer is biased in sub-threshold to provide large output voltage. At the supply voltage of 0.85 V, tunable free-running low-frequency band from 3.23 to 3.59 GHz and high-band from 1.71 to 1.73 GHz are found. The low-/high-band locking range is (61.7%) from 2.8 to 5.3 GHz/(64.9%) from 5.1 $\sim$ 10.0 GHz.
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