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This paper describes a divide-by-two injection-locked frequency divider(ILFD)for frequency synthesizers as used in multiband orthogonal frequency division multiplexing(OFDM)ultra-wideband(UWB)systems.By means of dual-injection technique and other conventional tuning techniques,such as DCCA and varactor tuning,the divider demonstrates a wide locking range while consuming much less power.The chip was fabricated in the Jazz 0.18μm RF CMOS process.The measurement results show that the divider achieves a locking range of 4.85GHz(6.23 to 11.08GHz)at an input power of 8dBm.The core circuit without the test buffer consumes only 3.7mA from a 1.8V power supply and has a die area of 0.38×0.28mm2.The wide locking range combined with low power consumption makes the ILFD suitable for its application in UWB systems.
This paper describes a divide-by-two injection-locked frequency divider (ILFD) for frequency synthesizers as used in multiband orthogonal frequency division multiplexing (OFDM) ultra-wideband (UWB) systems. By means of dual-injection technique and other conventional tuning techniques, such as DCCA and varactor tuning, the divider demonstrates a wide locking range while consuming much less power. The chip was fabricated in the Jazz 0.18 μm RF CMOS process. The measurement results show that the divider achieves a locking range of 4.85GHz ( 6.23 to 11.08GHz) at an input power of 8dBm. The core circuit without the test buffer consumes only 3.7mA from a 1.8V power supply and has a die area of 0.38 × 0.28mm2. The wide locking range combined with low power consumption makes the ILFD suitable for its application in UWB systems.