Differential Feedback Amplifier for Accurate RF Power Analysis
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Solution Overview
Problem
Modern mobile radio transceivers face challenges in accurately setting and maintaining transmission power and achieving linear transmission behavior, which is hindered by the need for precise measurement of transmission signals and the inefficiencies in power amplifier implementations, particularly in CMOS processes.
Innovation Solution
A transmission arrangement that includes an amplifier for differential signal amplification, an analysis circuit, and a differential feedback path allows for on-chip integration of the transmission device, amplifier, and feedback receiver, enabling accurate power measurement and linear signal processing through re-configurable CMOS large-scale integration and filter measures to suppress harmonic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission signals are fed back to an analysis circuit for power measurement and control, then transmission power accuracy and linearity are improved, but the system complexity and board area increase due to separate amplifier and analysis circuit implementations
Solution Approach 1:
The patent combines the amplifier and analysis circuit into a single integrated circuit, where the analysis circuit is directly integrated with the amplifier structure. This merging eliminates the need for separate feedback paths and external components, reducing board area while maintaining measurement accuracy through on-chip signal analysis.
Solution Approach 2:
The integrated circuit performs multiple functions within a single device: it amplifies transmission signals, analyzes signal properties, measures power, and provides feedback control all through one unified structure. This multi-functionality reduces the overall system component count and simplifies the device architecture.
2Ease of manufacture
If conventional separate implementations of amplifier and analysis circuit are used, then design simplicity is maintained, but board area and component count increase
Solution Approach 1:
The amplifier and analysis circuit are merged into a single integrated circuit chip, eliminating the need for separate discrete components and reducing board mounting requirements. This integration directly addresses the board area reduction goal while maintaining manufacturing feasibility through standard IC fabrication processes.
3Reliability
If differential feedback path is implemented, then signal analysis accuracy and linearity are improved, but the device complexity increases
Solution Approach 1:
The differential feedback path is integrated directly into the amplifier structure, with the analysis circuit internally connected to receive differential signals from the amplifier output. This internal integration maintains signal processing linearity while avoiding external feedback path complexity.
Data Source
AI summary
A transmission arrangement is disclosed having an amplifier which is set up to amplify a transmission signal and to provide it as an amplified transmission signal in differential form, an analysis circuit for determining a property of the amplified transmission signal, and a differential feedback path which is set up to supply the amplified transmission signal to the analysis circuit in differential form.