Multi-Bandwidth Envelope Tracking IC for Fast RF Voltage Transitions
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Solution Overview
Problem
Existing power amplifiers in wearable devices face challenges in maintaining optimal efficiency across a wide range of modulation bandwidths, particularly in higher bandwidths like those in 5G wireless communication systems, which requires rapid voltage transitions without compromising efficiency.
Innovation Solution
A multi-bandwidth envelope tracking (ET) integrated circuit (IC) that dynamically adjusts the supply voltage to enable quick transitions of the modulated voltage within a cyclic prefix duration, employing an ET voltage circuit and control circuit to generate different modulated voltages based on the modulation bandwidth, ensuring efficient power management across various wireless communication devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the supply voltage is increased to enable rapid voltage transitions for higher modulation bandwidths, then the transition speed is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic supply voltage adjustment where the ETIC control circuit monitors the modulation bandwidth and dynamically changes the supply voltage level. For higher bandwidths requiring faster transitions, the supply voltage is increased; for lower bandwidths, the voltage is reduced. This dynamic adaptation resolves the contradiction by making the power consumption proportional only to the actual transition speed requirement.
Solution Approach 2:
The system changes the supply voltage parameter based on the detected modulation bandwidth. The ETIC includes a control circuit that determines the appropriate supply voltage level corresponding to the RF signal's modulation bandwidth, thereby optimizing the balance between transition speed and power consumption for different operating conditions.
2Loss of time
If the supply voltage is dynamically adjusted to enable quick voltage transitions, then the transition time is reduced, but the efficiency of the ET voltage circuit may be compromised
Solution Approach 1:
The patent optimizes the supply voltage parameter to achieve the minimum necessary voltage level that still enables the required transition time. By carefully selecting and adjusting the supply voltage based on the specific transition requirements, the system achieves fast transitions while minimizing excess power consumption and maintaining ET voltage circuit efficiency.
3Adaptability or versatility
If the ETIC supports a wide range of modulation bandwidths, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The ETIC is designed with multi-functional capability to handle a wide range of modulation bandwidths (from narrowband to wideband 5G signals) using a single integrated circuit. The control circuit detects the modulation bandwidth and automatically configures the ET voltage circuit accordingly, eliminating the need for multiple separate circuits for different bandwidth requirements and thus reducing overall system complexity.
Data Source
AI summary
A multi-bandwidth envelope tracking (ET) integrated circuit (IC) (ETIC) is provided. The multi-bandwidth ETIC may be coupled to an amplifier circuit(s) for amplifying a radio frequency (RF) signal modulated in a wide range of modulation bandwidth. In examples discussed herein, the multi-bandwidth ETIC includes an ET voltage circuit configured to generate a modulated voltage based on a supply voltage. The supply voltage may be dynamically adjusted to cause the modulated voltage to transition quickly from one voltage level to another voltage level, particularly when the RF signal is modulated in a higher modulation bandwidth, without compromising efficiency of the ET voltage circuit. As such, the multi-bandwidth ETIC may generate different modulated voltages based on the modulation bandwidth of the RF signal, thus making it possible to employ the multi-bandwidth ETIC in a wide range of wireless communication devices, such as a fifth-generation (5G) wireless communication device.