- Patent Title: Wideband IQ mismatch correction for direct down-conversion receiver
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Application No.: US14962286Application Date: 2015-12-08
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Publication No.: US09647867B2Publication Date: 2017-05-09
- Inventor: Karthik Khanna Subramani , Nagarajan Viswanathan , Avinash Vasudev Sakleshpur , Jaiganesh Balakrishnan
- Applicant: TEXAS INSTRUMENTS INCORPORATED
- Applicant Address: US TX Dallas
- Assignee: TEXAS INSTRUMENTS INCORPORATED
- Current Assignee: TEXAS INSTRUMENTS INCORPORATED
- Current Assignee Address: US TX Dallas
- Agent Ronald O. Neerings; Charles A. Brill; Frank D. Cimino
- Main IPC: H04B10/06
- IPC: H04B10/06 ; H04L27/38 ; H04B1/10

Abstract:
A direct down-conversion (DDC) front end receiver includes first Q-channel that filters a sum of PRBS and baseband quadrature signals to generate a first filtered quadrature signal, a second Q-channel that filters a difference of the baseband and PRBS signals to generate a second filtered quadrature signal, a first I-channel and a second I-channel, Q-path and I-path PRBS cancellation blocks for cancelling corresponding PRBS components from sum of first and second filtered quadrature signals and sum of first and second filtered inphase signals respectively, Q-path and I-path sum filter estimation blocks for estimating quadrature and inphase sum filter responses. An IQ mismatch compensation filter estimate and tracking block estimates IQ mismatch compensation filter response from estimated quadrature and inphase sum filter responses, and an IQ mismatch compensation filter filters the modified inphase signal with the IQ mismatch compensation filter response, to generate a filter compensated inphase signal.
Public/Granted literature
- US20160373288A1 WIDEBAND IQ MISMATCH CORRECTION FOR DIRECT DOWN-CONVERSION RECEIVER Public/Granted day:2016-12-22
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