RF Circuit Feedback Receiver for Wideband Power Calibration
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Solution Overview
Problem
Conventional RF circuits are designed for low and narrow band frequencies and are not suitable for transmitting and receiving high frequency wideband signals, lacking couplers which complicates power control and calibration.
Innovation Solution
An electronic device with an RF circuit that includes a mixer, balun, and a feedback receiver (FBRX) to suppress image signals and effectively transmit and receive high frequency wideband signals, utilizing a power divider and coupler to facilitate power control and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional RF circuit design is used, then the circuit is suitable for low frequency narrow band signals, but it cannot effectively transmit and receive high frequency wideband signals
Solution Approach 1:
The RF circuit is divided into separate transmit path and receive path with dedicated components for each path. The transmit path includes transmit mixer, transmit amplifier, and transmit filter, while the receive path includes receive mixer, receive amplifier, and receive filter. This segmentation allows each path to be optimized for its specific function and frequency range, enabling the circuit to handle high frequency wideband signals effectively.
Solution Approach 2:
The circuit employs dynamic component selection through switches that can connect different filter banks depending on the operating frequency band. Multiple filter banks are designed with different frequency characteristics, and the switch dynamically selects the appropriate filter bank based on whether the signal is in low band or high band, allowing the circuit to adapt to different frequency ranges while maintaining signal integrity.
2Device complexity
If coupler is not included in the RF circuit, then the circuit structure is simpler, but power control and calibration become difficult
Solution Approach 1:
A coupler is introduced as an intermediary component in the transmit path that taps off a portion of the transmitted signal and feeds it to the receive path. This allows the receive path to monitor and measure the transmit signal characteristics without requiring separate test equipment, enabling easy power control and calibration while maintaining a relatively simple overall circuit structure.
Solution Approach 2:
The coupler enables feedback by routing a portion of the transmit signal to the receive path, where it can be measured and used to adjust transmit power levels. This feedback mechanism allows for automatic power control and calibration, making the circuit easier to operate and maintain while only adding a single coupler component to the otherwise simple structure.
3Device complexity
If image signals are not suppressed, then the circuit operation is simpler, but communication performance deteriorates
Solution Approach 1:
The image signals, which are normally harmful interference, are converted into useful information by routing them through the receive path to the processor. The processor can identify and analyze these image signals to determine transmit signal characteristics, turning what was previously a performance-degrading factor into a useful measurement resource that actually improves communication reliability.
Data Source
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AI summary
An electronic device is disclosed. The electronic device may include an antenna for transmitting and receiving a signal in an RF frequency band, and an RF circuit for processing the signal in the RF frequency band. The RF circuit may include an Rx path for transferring a first signal received through the antenna, a Tx path for transferring a second signal output from an amplifier to the antenna, and a coupler for transferring at least a part of the second signal obtained in the Tx path to the Rx path. In addition, various embodiments understood from the specification are possible.