Invention Grant
- Patent Title: Constant phase digital attenuator with on-chip matching circuitry
- Patent Title (中): 具有片上匹配电路的恒相数字衰减器
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Application No.: US12725533Application Date: 2010-03-17
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Publication No.: US07990201B2Publication Date: 2011-08-02
- Inventor: Wen Hui Zhang , Christopher Weigand
- Applicant: Wen Hui Zhang , Christopher Weigand
- Applicant Address: US MA Lowell
- Assignee: M/A-COM Technology Solutions Holdings Inc.
- Current Assignee: M/A-COM Technology Solutions Holdings Inc.
- Current Assignee Address: US MA Lowell
- Agent Christopher P. Maiorana, PC
- Main IPC: H03L5/00
- IPC: H03L5/00

Abstract:
Various embodiments are directed to providing constant phase digital attenuation. In one embodiment, a digital attenuator circuit (100) comprises an input node (102) to receive an input signal to be attenuated, an output node (104) to output an attenuated signal, a reference loss path (106) between the input node (102) and the output node (104), and an attenuation path (108) between the input node (102) and the output node (104). The reference loss path (106) comprises switching elements and matching circuitry to improve Voltage Standing Wave Ratio (VSWR), and the attenuation path (108) comprises switching elements and attenuating circuitry to attenuate the input signal when the digital attenuator circuit (100) is switched from a reference loss state to an attenuation state. An effective phase length of the reference loss path (106) and an effective phase length of the attenuation path (108) may be equalized to provide a constant phase when the digital attenuator circuit (100) is switched between states.
Public/Granted literature
- US20100171541A1 CONSTANT PHASE DIGITAL ATTENUATOR WITH ON-CHIP MATCHING CIRCUITRY Public/Granted day:2010-07-08
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