Voltage Conversion Chip Switching Frequency Adjustment for RF Isolation
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Solution Overview
Problem
Current dual-cell battery solutions for radio frequency power amplifiers in mobile devices, such as those operating in GSM networks, suffer from significant switching noise due to the charge pump power supply architecture of voltage conversion chips, leading to poor radio frequency performance indicators like Output Radio Frequency Spectrum (ORFS) and Conducted Spurious Emission (CSE).
Innovation Solution
A radio frequency control method and apparatus that detects the network standard in operation and adjusts the switching frequency of the voltage conversion chip to improve the isolation of the power amplifier. Specifically, when operating in a GSM network standard, the switching frequency is adjusted to 1.2 MHz to enhance the isolation of the GSM power amplifier, thereby reducing the impact of switching noise on radio frequency signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a charge pump power supply architecture is used in the voltage conversion chip, then voltage conversion is achieved, but switching noise signals are generated on power output
Solution Approach 1:
The patent adjusts the switching frequency parameter of the voltage conversion chip to 1.2MHz specifically for GSM power amplifiers. This parameter change optimizes the balance between voltage conversion efficiency and noise generation, reducing switching noise while maintaining the required power conversion capability.
2Reliability
If switching frequency is increased to reduce noise impact, then radio frequency performance improves, but power consumption increases
Solution Approach 1:
The patent sets the switching frequency to a specific value of 1.2MHz for GSM power amplifiers. This optimized parameter achieves the best balance between radio frequency performance (reducing noise modulation) and power consumption, avoiding excessive frequency increases that would waste energy.
3Reliability
If switching frequency is adjusted to improve isolation, then radio frequency performance indicators improve, but system complexity increases
Solution Approach 1:
The patent implements a simple parameter configuration approach where the switching frequency is set to 1.2MHz for GSM power amplifiers through basic register configuration. This avoids complex control systems while achieving the required isolation and radio frequency performance through straightforward parameter setting.
Data Source
AI summary
This application provides a radio frequency control method and apparatus, and an electronic device. The electronic device includes a first power amplifier, a dual-cell battery module, and a voltage conversion chip. The dual-cell battery module is connected to the first power amplifier through the voltage conversion chip. The radio frequency control method includes: detecting a network standard according to which the electronic device operates; and when the network standard according to which the electronic device operates is a first network standard, adjusting a switching frequency of the voltage conversion chip to improve an isolation of the first power amplifier.