Multimode Voltage Tracker Circuit for IoT Efficiency
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Solution Overview
Problem
Existing voltage tracker circuits are inadequate in maintaining a stable envelope tracking (ET) modulated voltage for amplifying RF signals with lower modulation bandwidths, leading to inefficiencies and performance issues in IoT networks.
Innovation Solution
A multimode voltage tracker circuit that operates in both low modulation bandwidth (LMB) and high modulation bandwidth (HMB) modes, generating average power tracking (APT) or ET modulated voltages based on the modulation bandwidth, ensuring efficient and stable voltage supply for RF signals across a wide range of bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional voltage tracker circuit is used for envelope tracking, then it can operate at high modulation bandwidths, but it fails to maintain stable modulated voltage at lower modulation bandwidths
Solution Approach 1:
The voltage tracker circuit dynamically switches between two operational modes (envelope tracking mode and average power tracking mode) based on the modulation bandwidth of the RF signal. This dynamic adaptation allows the circuit to maintain optimal performance across a wide range of bandwidths, resolving the contradiction between voltage stability at low bandwidths and adaptability to different bandwidth conditions.
Solution Approach 2:
The circuit changes its operational parameters by selecting different tracking algorithms based on the modulation bandwidth. At high bandwidths, it uses conventional envelope tracking with rapid voltage following, while at low bandwidths, it transitions to average power tracking with extended voltage maintenance, thereby achieving both voltage stability and broadband adaptability.
2Duration of action of stationary object
If the voltage tracker operates in envelope tracking mode for high bandwidth signals, then it achieves good linearity, but it cannot maintain voltage for sufficient duration at low bandwidths
Solution Approach 1:
The circuit dynamically adjusts its voltage maintenance strategy based on the signal characteristics. For low bandwidth signals where prolonged voltage maintenance is needed, it switches to average power tracking mode that extends the voltage duration. For high bandwidth signals requiring rapid response, it uses envelope tracking mode, thus achieving both extended duration and voltage stability through dynamic mode selection.
3Adaptability or versatility
If a single-mode voltage tracker is designed for low modulation bandwidth, then it maintains voltage well for IoT signals, but it cannot effectively support wide bandwidth WWAN signals
Solution Approach 1:
The voltage tracker circuit is designed with multi-functionality to handle both low bandwidth IoT signals and high bandwidth WWAN signals within a single device. By incorporating dual tracking modes (envelope tracking and average power tracking) that can be selectively activated based on signal requirements, the circuit achieves universal applicability across different communication standards without requiring separate dedicated circuits for each bandwidth range.
Data Source
AI summary
A multimode voltage tracker circuit is provided. The multimode voltage tracker circuit is configured to generate a modulated voltage for amplifying a radio frequency (RF) signal(s), which may be modulated in a wide range of modulation bandwidth. In one non-limiting example, the multimode voltage tracker circuit can be configured to operate in a low modulation bandwidth (LMB) mode to generate an average power tracking (APT) modulated voltage for amplifying the RF signal(s) when the RF signal(s) is modulated in a lower modulation bandwidth (e.g., <50 KHz). As such, the multimode voltage tracker circuit can be adapted to support lower bandwidth communications in an Internet-of-Things (IoT) network with improved efficiency, stability, and performance.