Method and apparatus for measuring and cancelling local oscillator feedthrough using an observation receiver
Number of patents in Portfolio can not be more than 2000
United States of America
Stats
-
Mar 25, 2025
Grant Date -
Dec 29, 2022
app pub date -
Jun 25, 2021
filing date -
Jun 25, 2021
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and apparatus for cancelling local oscillator feedthrough (LOFT). A transmitter includes a first mixer configured to mix a transmit signal with a first local oscillator signal. An observation receiver receives a fraction of a power of the transmit signal as a feedback signal and processes the feedback signal. The observation receiver includes a second mixer configured to mix the feedback signal with a second local oscillator signal. A LOFT correction estimation circuitry is configured to determine a DC offset to cancel LOFT at the first mixer in the transmitter based on measurements on outputs of the second mixer. An LOFT correction circuitry is configured to add the DC offset to the transmit signal. The LOFT correction estimation circuitry may determine the DC offset based on several measurements obtained by varying the DC offset and a phase shift in the second local oscillator signal in the observation receiver.
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International Classification(s)
- 2021 Application Filing Year
- H04L Class
- 33798 Applications Filed
- 20288 Patents Issued To-Date
- 60.03 % Issued To-Date
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- 0 Citation Count
- H04L Class
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