The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2018
Filed:
Mar. 14, 2013
Qualcomm Incorporated, San Diego, CA (US);
Xinwei Wang, Dunstable, MA (US);
Xiangdong Zhang, Westford, MA (US);
Marc Gerald Dicicco, Dunstable, MA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
A step attenuator with constant input capacitance and having good performance is disclosed. In an exemplary design, an apparatus includes a step attenuator having a constant input capacitance for different amounts of attenuation. The step attenuator receives an input signal, provides a variable amount of attenuation for the input signal, and provides an output signal. The step attenuator may include a plurality of attenuator sections coupled in series. Each attenuator section may include a plurality of capacitors and may have the constant input capacitance. At least one of the plurality of attenuator sections may be selected or unselected to obtain a selected amount of attenuation for the step attenuator. An attenuator section may provide a predetermined amount of attenuation or a variable amount of attenuation when selected. The apparatus may further include a power detector that receives and determines the power of the output signal from the step attenuator.