Invention Grant
- Patent Title: High-linearity receiver with transmit leakage cancellation
- Patent Title (中): 具有发射泄漏消除的高线性接收机
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Application No.: US12046387Application Date: 2008-03-11
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Publication No.: US08526903B2Publication Date: 2013-09-03
- Inventor: Prasad S Gudem , Li-Chung Chang
- Applicant: Prasad S Gudem , Li-Chung Chang
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM, Incorporated
- Current Assignee: QUALCOMM, Incorporated
- Current Assignee Address: US CA San Diego
- Agent Ramin Mobarhan
- Main IPC: H04B1/10
- IPC: H04B1/10

Abstract:
Techniques for performing transmit (TX) leakage cancellation are described. A receiver includes a low noise amplifier (LNA) and a TX leakage canceller. The LNA amplifies a receiver input signal and provides an amplified signal. The TX leakage canceller includes a downconverter, a notch filter, and an upconverter. The downconverter downconverts a canceller input signal (e.g., obtained from the LNA output) with a first LO signal at a transmit frequency and provides a downconverted signal. The notch filter filters the downconverted signal to pass an undesired signal (e.g., a TX leakage signal) and attenuate a jammer and a desired signal in the canceller input signal. The upconverter upconverts the filtered signal with a second LO signal at the transmit frequency and provides a feedback signal. The feedback signal is subtracted at the input or output of the LNA to cancel the undesired signal.
Public/Granted literature
- US20090233568A1 HIGH-LINEARITY RECEIVER WITH TRANSMIT LEAKAGE CANCELLATION Public/Granted day:2009-09-17
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