Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2011-05-24
2011-05-24
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S148000
Reexamination Certificate
active
07948286
ABSTRACT:
A loop bandwidth control apparatus applied to a phase locked loop (PLL) includes a first loop filter module, a second loop filter module, a control module, a first switching module, and a second switching module. The first filter module and the second loop filter module output a first voltage and a second voltage, respectively. The second loop filter module has a bandwidth different from that of the first loop filter module. According to one of the first voltage and the second voltage, the control module generates a bandwidth control signal. According to the bandwidth control signal, the first switching module forms a path between a charge pump and one of the first loop filter module and the second loop filter module, and the second switching module forms a path between a voltage-controlled oscillator (VCO) and one of the first loop filter module and the second loop filter module.
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Hsieh Ming-Yu
Wang Yao-Chi
Yen Shih-Chieh
Donovan Lincoln
Han Andy M.
Houston Adam D
MStar Semiconductor Inc.
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