Self-dividing oscillators

Details Self-dividing oscillators Self-dividing oscillators

2005-03-15

2005-03-15

Mis, David (Department: 2817)

Oscillators

Polyphase output

C331S075000, C331S1170FE, C331S172000, C331S17700V, C327S118000, C327S254000

Reexamination Certificate

active

06867656

ABSTRACT:
A system for generating in-phase and quadrature phase signals is provided. The system includes a first and a second differential output, such as from a sinusoidal oscillator. A first injection-locked frequency divider, such as one that uses an LC oscillator in conjunction with cross-coupled transistors, receives the first differential output and generates a in-phase or in-phase output. A second injection-locked frequency divider receives the second differential output and generates a quadrature phase output.

REFERENCES:
patent: 4806872 (1989-02-01), Cowley
Search Report for PCT/US03/19146 Dated Dec. 2, 2003 in co-pending PCT filing of U.S. application filed herewith.
Chi et al., “Integrated 2.4 GHz CMOS Quadrature VCO with Symmetrical Spiral Indyctors and Differential Varactors”, Institute of Microelectronics, Tsinghua University, Bejing, 100084, China, 2002 IEEE MTT-S Digest, pp. 561-564, XP-001099553.
Lee, et al., “5-GHz CMOS Wireless LANs,” IEEE Transactions on Microwave Theory and Techniques, vol. 50, No. 1, Jan., 2002, pp. 268-280, XP-001085549.
Wu et al., “A 19 GHz 0.5Mw 0.35 μm CMOS Frequency Divider with Shunt-Peaking Locking-Range Enhancement,” California Institute of Technology, Padadena, California, ISSCC 2001, Session 26, Wireless Building Blocks II, 26.3, pp. 412-413 & 471.
Chi, et al., “Low-Power CMOS VCO and Its Divide-by-2 Dividers with Quadrature Outputs for 5GHZ/2.5GHz WLAN Transceivers”, Institute of Microelectronics, Tsinghua University, Bejing, 100084, China, 0-7803-7547-5/02, 2002 IEEE, pp. 525-528.

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