本論文提出三個除頻器，第一個電路先描述一個除二新型寬鎖頻範圍注入鎖定除頻器，是使用 TSMC 0.18 μm CMOS製程。此注入鎖定除頻器是除二電路。量測結果為供應電壓0.75 V，而可調範圍3.910至3.956 GHz，核心電流為5.01 mA，核心功耗為3.76 mW。注入訊號為0 dBm時，其除二鎖頻範圍為4.23至11.30 GHz。
第二個電路描述一個除三注入鎖定除頻器，此電路是使用TSMC 3P3M BiCOMS 0.35 μm製程，此注入鎖定除頻器是除三電路，量測結果為供應電壓1.2 V，而可調範圍則是使用電壓來改變可變電容，達到頻率可調的機制。可調範圍由1.188 GHz至1.004 GHz，當入射功率為-3 dBm時，其總鎖頻範圍為3.03 GHz至3.68 GHz，總功耗為2.05 mW。
最後一個電路是描述一個多模數注入鎖定除頻器，是使用TSMC 0.18 μm CMOS製程，此注入鎖定除頻器可以當作一個除一電路、除偶數或奇數的除頻器，量測結果為供應電壓1.5 V，而可調範圍4.85至5.13 GHz，核心電流為2.78 mA，核心功耗為4.17 mW。注入訊號為0 dBm時，其除1 (2, 3, 4)鎖頻範圍為3.72 to 8.69 (8.42 to 10.95, 13.66 to 16.03, 19.13 to 20.5) GHz。

Firstly, this thesis presents a new wide locking range injection-locked frequency divider (ILFD) using a standard 0.18 μm CMOS process. The ILFD is based on a differential VCO with one injection MOSFET for coupling the external signal to the resonator. The locking range of the ILFD is increased by using a new LC resonator. Measurement results show that at the supply voltage of 0.75 V, the divider’s free-running frequency is tunable from 3.91 to 3.956 GHz, and at the incident power of 0 dBm the locking range is about 7.07 GHz (91 %), from the incident frequency 4.23 to 11.3 GHz. The ILFD has a record locking range percentage among published divide-by-2 LC-tank cross-coupled ILFDs.
The second circuit is an LC-tank oscillator-based divide-by-3 injection locked frequency divider (ILFD), and it was implemented in the 0.35 μm SiGe 3P3M BiCMOS technology. Measurement results show that when the supply voltage Vdd is biased at 1.2 V, the free-running oscillation frequency of the ILFD is tunable from 1.19 GHz to 1.0 GHz, and at the incident power of -3 dBm the operation locking range is about 0.65 GHz, from the incident frequency 3.03 to 3.68 GHz. The core power consumption is 2.05 mW at Vdd = 1.2 V.
Finally, a new wide-locking range multi-modulus LC-tank injection locked frequency divider (ILFD) is proposed and was fabricated in a 0.18 μm CMOS process. The ILFD circuit is realized with a complementary MOS LC-tank oscillator and an injection composite composed of an inductor in series with an injection MOS. The two output terminals of the injection composite are connected to the resonator outputs. The ILFD can be used as a first-harmonic oscillator (ILO), even-modulo or odd-modulo oscillator depending upon the incident frequency of injection signal. At the supply voltage of 1.5 V, the free-running frequency is from 4.85 GHz to 5.13 GHz, the current and power consumption of the divider without buffers are 2.78 mA and 4.17 mW respectively. At the incident power of 0 dBm, the locking range in the divide-by-1(2, 3, 4) mode is from the incident frequency 3.72 to 8.69 (8.42 to 10.95, 13.66 to 16.03, 19.13 to 20.5) GHz.

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