A Multi-Band Quadrature Clock Generator With High-Pass-Filtered Pulse Injection Technique

• Published in: IEEE microwave and wireless components letters 2013-02, Vol.23 (2), p.96-98
• Main Authors: Sang-yeop Lee, Kamimura, T., Yonezawa, S., Shirane, A., Ikeda, S., Ito, H., Ishihara, N., Masu, K.
• Format: Article
• Language: English
• Subjects: Applied sciences; Buffers; Carriers; Circuit properties; Circuits of signal characteristics conditioning (including delay circuits); Clock generators; Clocks; CMOS; Delay; Design. Technologies. Operation analysis. Testing; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; Frequency filters; Harmonic analysis; high-pass filter (HPF); Injection locking; injection locking (IL); Injection-locked oscillators; Integrated circuits; Microwaves; Oscillators, resonators, synthetizers; Phase locked loops; Phase noise; phase-locked loop (PLL); Quadratures; ring VCO; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Voltage-controlled oscillators
• ISSN: 1531-1309; 2771-957X; 1558-1764; 2771-9588
• DOI: 10.1109/LMWC.2013.2239634

A high-pass-filtered (HPF) pulse injection technique is proposed to reduce spurs near the carrier signal due to injection locking. By using this technique, a multi-band quadrature clock generator consisting of a wide-frequency range injection-locked PLL and a frequency-selectable local buffer is demonstrated. The proposed clock generator was fabricated in a 65 nm CMOS. For a 100 MHz reference, the circuit can output 1.0, 2.0, and 4.0 GHz quadrature outputs with an eight-phase VCO and the buffer. It shows an 1 MHz-offset phase noise -105 dBc/Hz and a reference spur level of -50 dBc at 2.0 GHz, with enabling HPF pulse injection. The total power consumption is lower than 32 mW at 4 GHz.