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US 2010/0134205 A1Published application
Tunable multi frequency bands filter device
AssigneeNXP B.V.
InventorPatrice Gamand
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AssigneeNXP B.V.
InventorPatrice Gamand
Estimating the term…
The present invention relates to a tunable filter device for providing a tunable band pass characteristics for the receive path of a multi-band front-end module. According to the invention is proposed, a distributed, wide-band amplifier with a low-frequency cut-off and a high-frequency cut-off in combination with a LCR network, of which wide-band amplifier the DC blocking capacitors define the low-frequency cut-off of the filter device, whilst the high-frequency cut-off is determined by the cut-off frequency of the artificial input and output transmission lines of the LCR network. In one embodiment, additional capacitors are coupled in parallel to the DC blocking capacitors of the LCR network, switchable by MOS transistors as switching elements. Accordingly, in a certain embodiment it is proposed to allow tuning of the low- and the high-frequency cut-off by programming with a digital control command.
A tunable filter device comprising:
A method for tuning a frequency characteristics of a filter device comprising a distributed wide-band amplifier having at least two amplifying elements, an input transmission line connected to the input of the filter device and connecting inputs of the at least two amplifying elements, an output transmission line connected to the output of the filter device and connecting outputs of the at least two amplifying elements, and the frequency characteristics having a low cut-off frequency and a high cut-off frequency, wherein the method comprises the steps:
Dependencies are inferred from the claim text.