Multi-level digital step attenuator and digital step attenuation device
AssigneeMediatek Inc.
InventorsWei-Hsin TSENG, Jhen-Kai WANG
Life of this patent
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Abstract
A multi-level digital step attenuator (DSA) with a hybrid attenuation circuit is shown. The hybrid attenuation circuit is coupled between an input node and an output node of the multi-level DSA. The bypass switch of the multi-level DSA is controlled to provide a bypass path between the input node and the output node of the of the multi-level DSA when the hybrid attenuation circuit is in a disabled state. In the first active state, the hybrid attenuation circuit is switched to form a T-type structure to provide a first amount of signal attenuation. In the second active state, the hybrid attenuation circuit is switched to form a Pi-type structure to provide a second amount of signal attenuation.
Claims15
A multi-level digital step attenuator, comprising:
- a hybrid attenuation circuit, coupled between an input node and an output node of the multi-level digital step attenuator;
- and
- a bypass switch, controlled to provide a bypass path between the input node and the output node of the multi-level digital step attenuator when the hybrid attenuation circuit is in a disabled state;
- wherein:
- in a first active state, the hybrid attenuation circuit is switched to form a T-type structure to provide a first amount of signal attenuation;
- and
- in a second active state, the hybrid attenuation circuit is switched to form a Pi-type structure to provide a second amount of signal attenuation.
Dependencies are inferred from the claim text.