Semiconductor integrated circuit with PLL circuit

Details Semiconductor integrated circuit with PLL circuit Semiconductor integrated circuit with PLL circuit

2007-10-09

2007-10-09

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S016000

Reexamination Certificate

active

11178565

ABSTRACT:
In a PLL circuit including an oscillator, a phase comparator, a charge pump circuit, and a loop filter, without providing a plurality of capacitative elements, that is, without increasing the occupied area so much, the characteristics of the PLL circuit can be adjusted according to manufacture variations in a resistive element and a capacitative element, and a loop filter can be formed on a chip. A resistive element and a capacitative element of a loop filter are formed on a semiconductor chip. As the resistive element, a plurality of elements having different resistance values are provided and switched by a switch, thereby enabling the resistance value to be adjusted. Current in a charge pump circuit is also made adjustable, and the current of the charge pump circuit is adjusted according to switching among the resistance values of the resistive elements.

REFERENCES:
patent: 2002/0042256 (2002-04-01), Baldwin et al.
patent: 2005/0110537 (2005-05-01), Wurzer
patent: 2005/0239499 (2005-10-01), Oosawa et al.
patent: 9-331251 (1997-12-01), None

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