Invention Grant
- Patent Title: Output driver with slew rate calibration
- Patent Title (中): 输出驱动器,具有压摆率校准
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Application No.: US14056904Application Date: 2013-10-17
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Publication No.: US09083330B2Publication Date: 2015-07-14
- Inventor: Michael Joseph Brunolli , Mark Wayland
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Haynes and Boone, LLP
- Main IPC: H03K19/003
- IPC: H03K19/003 ; H03K19/00 ; H03K19/0175 ; H04L25/02

Abstract:
An output driver for driving a data output signal through an output pad includes a plurality of calibration paths to calibrate the impedance of the output pad. Depending upon the desired impedance, various ones of the calibration paths are selectively coupled to the output pad. Each selected calibration path adds a capacitive load to a data node, which affects the slew rate for the data output signal. To adjust the capacitive load on the data node in light of the calibration path selections, the output driver includes a plurality of selectable capacitors corresponding to the plurality of calibration paths. If a calibration path is not selected to couple to the output pad, the corresponding selectable capacitor capacitively loads the data node.
Public/Granted literature
- US20150109023A1 OUTPUT DRIVER WITH SLEW RATE CALIBRATION Public/Granted day:2015-04-23
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