RF Transceiver Supporting Multiple IF Conversion Schemes
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Solution Overview
Problem
Existing radio frequency chipsets are limited to zero-Intermediate Frequency (zero-IF) frequency conversion schemes and cannot support low-IF and digital-IF conversion schemes, requiring redesign of transceiver boards and lacking Digital Pre-Distortion (DPD) feedback paths.
Innovation Solution
A radio frequency transceiver design that includes low pass filters, I/Q modulators, and amplifiers, allowing for flexibility in frequency conversion schemes (Zero IF, Low IF, and Digital IF) and incorporating a feedback path for DPD, enabling reuse without full redesign and reducing material costs through PCB utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a radio frequency chipset is designed to support only zero-IF frequency conversion scheme, then the design is simple and cost-effective, but it cannot support low-IF and digital-IF conversion schemes requiring full redesign
Solution Approach 1:
The radio frequency transceiver is designed with universal components including I/Q modulators, I/Q demodulators, low pass filters, and amplifiers that can function across multiple frequency conversion schemes (zero-IF, low-IF, and digital-IF). This multi-functionality allows a single transceiver design to support different IF modes without requiring complete redesign, thereby resolving the contradiction between adaptability and design complexity.
2Adaptability or versatility
If the frequency conversion scheme is changed according to standard specification and bandwidth assignment, then the transceiver can adapt to different standards, but the radio frequency chipset must be changed and transceiver board needs redesign
Solution Approach 1:
The transceiver incorporates dynamic configuration capabilities where the I/Q modulators, I/Q demodulators, and filtering components can be dynamically configured or reconfigured to operate under different frequency conversion schemes. This dynamic adaptability allows the same hardware to meet different standard specifications and bandwidth assignments without physical redesign, easing manufacturing requirements.
3Device complexity
If a radio frequency chipset supports only zero-IF scheme, then the design is simplified, but it lacks feedback path for Digital Pre-Distortion (DPD)
Solution Approach 1:
The radio frequency transceiver incorporates a feedback path that enables Digital Pre-Distortion (DPD) functionality. The feedback mechanism allows the transceiver to monitor its own output and adjust parameters accordingly, improving linearity and efficiency. This feedback path is integrated into the universal design that supports multiple frequency conversion schemes, maintaining design simplicity while enabling DPD functionality.
Data Source
AI summary
A radio frequency transceiver which can support various frequency conversion schemes is provided. The radio frequency transmitter includes a first low pass filter, a second low pass filter, a first filter input port connected to an input terminal of the first low pass filter, a second filter input port connected to an input terminal of the second low pass filter, a first filter output port connected to an output terminal of the first low pass filter, a second filter output port connected to an output terminal of the second low pass filter, an I/Q modulator, an I input port connected to an I input terminal of the I/Q modulator, a Q input port connected to a Q input terminal of the I/Q modulator; and a Radio Frequency (RF) output port connected to an output terminal of the I/Q modulator.