Oscillators – Ring oscillators
Patent
1992-08-03
1993-12-21
Grimm, Siegfried H.
Oscillators
Ring oscillators
331 17, 331 25, 331 34, 331108A, 331108B, 331177R, 331179, H03B 502, H03L 7099
Patent
active
052724530
ABSTRACT:
A method and apparatus for switching between gain curves of a switched gain voltage controlled oscillator (VCO) 52, 52' or 52". In one form, the present invention uses a switched gain voltage controlled oscillator (VCO) 52, 52' or 52" which utilizes a ring oscillator. A Gain Control signal is used to select between using a high gain curve and using a low gain curve. The low gain curve is produced by selecting a high resistance path to either power or ground. The high gain curve is produced by selecting a low resistance path to either power or ground.
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patent: 4988960 (1991-01-01), Tomisawa
Mihai Banu; MOS Oscillators with Multi-Decade Tuning Range and Gigahertz Maximum Speed; IEEE Journal of Solid-State Circuits, vol. 23, No. 6, Dec. 1988; pp. 1386-1393.
Mihai Banu; Session I: High-Speed Data Recovery-WAM 1.5: 100 KHz-1 GHz NMOS Variable-Frequency Oscillator with Analog and Digital Control; 1988 IEEE International Solid State Circuits Conference, Feb. 17, 1988; pp. 20-22.
Burch Kenneth R.
Hsu Hengwei
Traynor Kevin M.
Grimm Siegfried H.
Hill Susan C.
Motorola Inc.
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