LC-Tank Colpitts Injection-Locked Frequency Divider With Even and Odd Modulo

• Published in: IEEE microwave and wireless components letters 2009-02, Vol.19 (2), p.113-115
• Main Authors: JANG, Sheng-Lyang, LUO, Jhong-Chen, CHANG, Chia-Wei, LEE, Chien-Feng, HUANG, Jhin-Fang
• Format: Article
• Language: English
• Subjects: Applied sciences; Capacitance; Circuit properties; Circuits; CMOS; CMOS technology; colpitts VCO; Design. Technologies. Operation analysis. Testing; Electric potential; Electric, optical and optoelectronic circuits; Electronic circuits; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; Exact sciences and technology; Frequency conversion; Frequency dividers; Frequency measurement; Integrated circuits; LC-tank injection-locked frequency divider; locking range; Microwaves; MOSFET circuits; MOSFETs; Oscillators; Oscillators, resonators, synthetizers; Semiconductor device measurement; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Signal convertors; Tunable circuits and devices; Tuning; Voltage; Voltage-controlled oscillators
• ISSN: 1531-1309; 2771-957X; 1558-1764; 2771-9588
• DOI: 10.1109/LMWC.2008.2011338

A new injection-locked frequency divider (ILFD) using a standard 0.18 mum CMOS process is presented. The ILFD is based on a differential Colpitts voltage controlled oscillator (VCO) with a direct injection MOSFET for coupling an external signal to the resonators. The VCO is composed of two single-ended VCOs coupled with two transformers. Measurement results show that at the supply voltage of 1.4 V the divider's free-running frequency is tunable from 4.77 to 5.08 GHz, and the proposed circuit can function as a first harmonic injection-locked oscillator, divide-by-2, -3, and -4 frequency divider. At the incident power of 0 dBm the divide-by-2 operation range is from the incident frequency 7.7 to 11.5 GHz and the divide-by-4 operation range is from the incident frequency 18.9 to 20.2 GHz.