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A Wide Band Injection Locked Frequency Divider With Variable Inductor Load

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3 Author(s)
Yun-Hsueh Chuang ; Dept. of Electron. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei ; Sheng-Lyang Jang ; Shao-Hwa Lee

This letter proposes a new wide band CMOS injection locked frequency divider (ILFD). The circuit is made of a two-stage differential CMOS ring oscillator and is based on MOS switches directly coupled to the differential outputs of the ring oscillator. A tuning circuit composed of inductors in series with a metal oxide semiconductor field effect transistor is used to extend the locking range. The divide-by-two ILFD can provide wide locking range and the measured results show that at the supply voltage of 1.8 V, the free-running frequency of the ILFD is operating from 0.92 to 3.6 GHz while the Vtune is tuned from 0 to 1.8 V. At the incident power of 0 dBm, this ILFD has a wide locking range from 1.15 to 7.4 GHz

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:17 ,  Issue: 6 )