Phase locked loop, semiconductor device, and wireless tag

Details Phase locked loop, semiconductor device, and wireless tag Phase locked loop, semiconductor device, and wireless tag

2011-07-05

2011-07-05

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S00100A, C331S014000, C331S016000, C331S018000, C331S025000, C455S076000, C455S260000

Reexamination Certificate

active

07973608

ABSTRACT:
An object is to provide a PLL having a wide operating range. Another object is to provide a semiconductor device or a wireless tag which has a wide operating range in a communication distance or temperature by incorporating such a PLL. The semiconductor device or the wireless tag includes a first divider circuit; a second divider circuit; a phase comparator circuit to which an output of the first divider circuit and an output of the second divider circuit are provided; a loop filter to which an output of the phase comparator circuit is supplied and in which a time constant is switched in accordance with an inputted signal; and a voltage controlled oscillator circuit to which an output of the loop filter is supplied and which supplies an output to the second divider circuit.

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