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US 2009/0021331 A1Published application
Step attenuator
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsHyeon Seok Hwang, Yoo Sam Na, Moon Sun Kim, Byeong Hak Jo, Kyoung Seok Park
Life of this patent
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Abstract
There is provided a step attenuator having two Pi-type attenuators and one bridged-T type attenuator that share some resistors. The step attenuator is used to prevent a reduction in frequency range caused by use of MOS transistors and reduce attenuation of signal power and frequency band by the MOS transistors, thereby obtaining a low attenuation value and reducing input and output mismatch.
Claims6
A step attenuator comprising:
- first and second resistors connected in series with each other between an input terminal and an output terminal;
- a first switch connected in parallel between both ends of one of the first and second resistors;
- a second switch having one end connected to the input terminal;
- a third resistor having one end connected to the other end of the second switch and the other end connected to a ground terminal;
- fourth and fifth resistors having one set of ends connected to a connection node between the first resistor and the second resistors and other set of ends connected to a ground terminal;
- and
- a third switch having one end connected to the output terminal;
- a sixth resistor having one end connected to the other end of the third switch and the other end connected to the ground terminal;
- a fourth switch having one end connected to one of the input terminal and the output terminal;
- and
- a seventh resistor having one end connected to the other end of the fourth switch and the other end connected to one terminal between the input and output terminals while the one terminal is not connected to the fourth switch.
8 more elements
Dependencies are inferred from the claim text.