Envelope Detector Spurious Emissions Calibration
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Solution Overview
Problem
Existing transceivers face challenges in detecting and calibrating spurious emissions, such as leaked local oscillator signals and image signals, which can degrade signal quality and interfere with other systems.
Innovation Solution
Incorporating an envelope detector within the transceiver to tap the output of the upconverting mixer and output an envelope indicating leaked LO signals and image signals, which is then used by a controller to calibrate the upconverting mixer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional transceiver design is used, then device complexity is reduced, but spurious emissions detection capability is insufficient
Solution Approach 1:
The envelope detector is integrated within the transceiver architecture, merging the detection function with the existing transmission and reception components. This allows spurious emissions detection to be performed using shared hardware resources rather than adding completely separate detection equipment, thereby improving measurement precision while limiting the increase in device complexity.
Solution Approach 2:
The envelope detector is designed to perform multiple functions: detecting envelope signals, identifying leaked LO signals, and detecting image signals. By making the detection component multi-functional, the system achieves comprehensive spurious emissions detection capability without proportionally increasing device complexity.
2Reliability
If spurious emissions are not detected and calibrated, then device complexity is reduced, but signal quality degrades
Solution Approach 1:
The system implements a feedback mechanism where the envelope detector continuously monitors the transmitter signal and provides detection results back to the controller. The controller then adjusts mixer settings based on this feedback to reduce spurious emissions, creating a closed-loop system that improves signal quality through automatic calibration.
Solution Approach 2:
The transceiver performs self-calibration by using its own internal envelope detector to identify spurious emissions and automatically adjusting its mixer parameters through the controller. This self-service approach improves signal quality without requiring external calibration equipment or manual intervention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively detects and reduces spurious emissions, improving signal quality and reducing interference, thereby enhancing the overall performance of the transceiver.
Implementation Method 1
The upconverting mixer can be configured to mix an input signal with a local oscillator (LO) signal to generate a transmitter signal
Implementation Method 2
The envelope detector can be configured to receive the transmitter signal outputted from the upconverting mixer. The envelope detector can be configured to output an envelope of the transmitter signal
Data Source
AI summary
Methods and systems for operating a transceiver are described. A transceiver can include an upconverting mixer, a downconverting mixer, a controller, and an envelope detector. The upconverting mixer can mix an input signal with a local oscillator (LO) signal to generate a transmitter signal. The envelope detector can receive the transmitter signal outputted from the upconverting mixer and output an envelope of the transmitter signal to an output line of the downconverting mixer. The envelope can indicate at least one of a leaked LO signal and an image signal. The controller can receive a calibration parameter that is based on at least one of the leaked LO signal and image signal and calibrate the upconverting mixer based on the calibration parameter.