Digital step attenuator with a diversion circuit for high-frequency signal
AssigneeMediatek Inc.
InventorsJhen-Kai Wang, Wei-Hsin Tseng
Life of this patent
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Abstract
A digital step attenuator (DSA) with efficient high-frequency signal attenuation is shown. The DSA has an attenuation circuit, a bypass switch, and a diversion circuit. The attenuation circuit is coupled between an input node and an output node of the digital step attenuator. The bypass switch is controlled by a bypass control signal to provide a bypass path between the input node and the output node of the digital step attenuator. The diversion circuit couples a control terminal of the bypass switch to a ground terminal in response to the bypass control signal being in an inactive state.
Claims16
A digital step attenuator, comprising:
- an attenuation circuit, coupled between an input node and an output node of the digital step attenuator;
- a bypass switch, controlled by a bypass control signal to provide a bypass path between the input node and the output node of the digital step attenuator;
- and
- a diversion circuit, coupling a control terminal of the bypass switch to a ground terminal in response to the bypass control signal being in an inactive state;
- wherein the diversion circuit has a capacitance device coupled to the control terminal of the bypass switch, and a resistance device coupled in series between the capacitance device and the ground terminal in response to the bypass control signal being in the inactive state.
Dependencies are inferred from the claim text.