Low-power fast-startup oscillator with digital feedback control

Details Low-power fast-startup oscillator with digital feedback control Low-power fast-startup oscillator with digital feedback control

2007-06-28

2009-11-10

Cho, James H. (Department: 2819)

Oscillators

With particular source of power or bias voltage

C331S183000, C331S158000

Reexamination Certificate

active

07616074

ABSTRACT:
Embodiments of the present invention provide a system for controlling a startup time of an oscillator circuit. The system includes a variable current source coupled to the oscillator circuit, wherein a startup time of the oscillator circuit is proportional to a bias current input into the oscillator circuit from the variable current source. The system also includes a control mechanism coupled to the variable current source and to the output of the oscillator circuit. Upon startup, the control mechanism is configured to adjust the variable current source to input a large startup bias current into the oscillator circuit. After the oscillator circuit outputs a predetermined number of oscillations during startup, the control mechanism is configured to adjust the variable current source to decrease its current to a smaller steady-state bias current into the oscillator circuit.

REFERENCES:
patent: 4956618 (1990-09-01), Ulmer
patent: 2004/0212444 (2004-10-01), Peng
patent: 2007/0024385 (2007-02-01), Greenberg

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