Envelope Tracking PMIC With Dynamic Voltage Range Modulation
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Solution Overview
Problem
Existing power management circuits in mobile communication devices require a wide voltage range for envelope tracking, leading to reduced operating efficiency.
Innovation Solution
A power management integrated circuit (PMIC) that employs load and supply modulation to dynamically adjust the voltage range, reducing the peak-to-peak voltage range to improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide voltage range is used for envelope tracking in power management circuits, then the power amplifier can amplify RF signals across the full peak-to-peak power range, but the operating efficiency is reduced due to increased alternating current sourcing requirements
Solution Approach 1:
The patent applies dynamics by making the voltage range dynamic rather than static. The PMIC adjusts the envelope tracking voltage range in real-time based on the actual power amplification requirements of the RF signal. When the RF signal requires full peak-to-peak power range amplification, the full voltage range is applied; when lower power levels are sufficient, the voltage range is reduced accordingly. This dynamic adaptation resolves the contradiction by allowing the system to maintain high adaptability when needed while improving operating efficiency during normal operation.
Solution Approach 2:
The patent changes the voltage range parameter dynamically based on operational conditions. The PMIC monitors the power amplification requirements and adjusts the envelope tracking voltage range parameter accordingly. By changing this parameter from a fixed wide range to a variable range that matches actual needs, the system achieves both high adaptability when full range is required and improved energy efficiency when reduced range suffices, directly resolving the technical contradiction.
2Use of energy by moving object
If the envelope tracking voltage range is reduced to improve operating efficiency, then less alternating current is sourced and efficiency improves, but the ability to amplify RF signals across the full peak-to-peak power range is limited
Solution Approach 1:
The system dynamically adjusts the voltage range based on real-time power amplification requirements. When RF signals require full peak-to-peak power range amplification, the PMIC expands the envelope tracking voltage range to its maximum capability, ensuring full adaptability is maintained. During normal operation with lower power requirements, the voltage range is contracted to improve operating efficiency. This dynamic behavior resolves the contradiction by making adaptability conditional rather than constant.
Solution Approach 2:
The PMIC changes the envelope tracking voltage range parameter based on monitored power amplification needs. When the RF signal power level indicates requirement for full amplification capability, the voltage range parameter is set to maximum; otherwise, it is reduced to optimize efficiency. This parameter change strategy ensures that the system maintains full RF signal amplification capability when needed while achieving improved operating efficiency during normal operation, resolving the apparent contradiction between these two requirements.
Data Source
AI summary
A power management circuit operable with a reduced voltage range is provided. Herein, a power management integrated circuit (PMIC) is configured to generate an envelope tracking (ET) voltage whereby a power amplifier circuit can amplify a radio frequency (RF) signal for transmission. Specifically, the power management circuit can be configured according to various embodiments to achieve the reduced voltage range by applying a combination of load modulation and supply modulation across a larger voltage range (e.g., a peak-to-peak voltage range) required for amplifying the RF signal between a peak-to-peak power range (a.k.a. minimum to maximum power range). By dynamically reducing the voltage range of the RF signal, the PMIC and/or the power amplifier circuit in the power management circuit can operate with an improved efficiency to thereby provide an improvement in the user experience.