Multi-level digital step attenuator and digital step attenuation device
AssigneeMediatek Inc.
InventorsWei-Hsin Tseng, Jhen-Kai Wang
Life of this patent
Estimating the term…
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.
Claims13
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, wherein the hybrid attenuation circuit comprises:
- a first electronic component and a second electronic component, coupled in series between the input node and the output node of the multi-level digital step attenuator;
- a third electronic component, coupling a connection node between the first electronic component and the second electronic component to a ground terminal in a first active state of the hybrid attenuation circuit, to form a T-type structure with the first electronic component and the second electronic component and so that the hybrid attenuation circuit in the first active state provides a first amount of signal attenuation;
- and
- a fourth electronic component and a fifth electronic component, wherein in a second active state of the hybrid attenuation circuit, the fourth electronic component is coupled between the input node of the multi-level digital step attenuator and the ground terminal, and the fifth electronic component is coupled between the output node of the multi-level digital step attenuator and the ground terminal, to form a Pi-type structure with the first electronic component and the second electronic component and so that the hybrid attenuation circuit in the second active state provides a second amount of signal attenuation;
- 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.
Dependencies are inferred from the claim text.