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:
Aug. 02, 2011
Filed:
Mar. 17, 2010
Wen Hui Zhang, Nashua, NH (US);
Christopher Weigand, Andover, MA (US);
Wen Hui Zhang, Nashua, NH (US);
Christopher Weigand, Andover, MA (US);
M/A-COM Technology Solutions Holdings Inc., Lowell, MA (US);
Abstract
Various embodiments are directed to providing constant phase digital attenuation. In one embodiment, a digital attenuator circuit () comprises an input node () to receive an input signal to be attenuated, an output node () to output an attenuated signal, a reference loss path () between the input node () and the output node (), and an attenuation path () between the input node () and the output node (). The reference loss path () comprises switching elements and matching circuitry to improve Voltage Standing Wave Ratio (VSWR), and the attenuation path () comprises switching elements and attenuating circuitry to attenuate the input signal when the digital attenuator circuit () is switched from a reference loss state to an attenuation state. An effective phase length of the reference loss path () and an effective phase length of the attenuation path () may be equalized to provide a constant phase when the digital attenuator circuit () is switched between states.