Widely tunable ring oscillator utilizing active negative...

Details Widely tunable ring oscillator utilizing active negative... Widely tunable ring oscillator utilizing active negative...

2005-09-13

2005-09-13

Chang, Joseph (Department: 2817)

Oscillators

Ring oscillators

C327S264000

Reexamination Certificate

active

06943633

ABSTRACT:
A ring oscillator that uses active negative capacitance at one or more stages of the ring oscillator to adjust the frequency of oscillation. By using a negative capacitance generator, negative capacitance may be placed in shunt with each stage of the ring, thereby reducing the effective input capacitance. Tuning of the ring oscillation frequency is accomplished without changing the bias point of each stage. The ring oscillation frequency may be increased, rather than reduced as in current approaches.

REFERENCES:
patent: 5028888 (1991-07-01), Ray
patent: 5558477 (1996-09-01), Browning et al.
patent: 6556089 (2003-04-01), Wood
Data Sheet of PA85, High Voltage Power Operational Amplifiers, APEX Microtechnology Oct. 2003.

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