Transmission Apparatus Antenna Switching Spurious Signal Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bluetooth Low Energy (BLE) transmission systems face issues with spurious signal generation due to high-speed antenna switching, leading to power consumption inefficiencies and reduced transmission quality.
Innovation Solution
A transmission apparatus is designed with a power amplifier, antenna switch, and control circuit that performs synchronized Ramp control and IQ complex amplitude control to manage antenna switching, minimizing spurious signal generation by optimizing power amplifier output and antenna switching timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high-speed antenna switching is performed to suppress power consumption in BLE, then power consumption is reduced, but spurious signals are generated due to discontinuity
Solution Approach 1:
The control circuit performs output power control of the power amplifier in advance when generating a switching control signal for antenna switching. By preliminarily adjusting the power amplifier output according to the switching timing, the discontinuity caused by high-speed antenna switching is suppressed, thereby reducing spurious signal generation while maintaining power consumption benefits
Solution Approach 2:
The control circuit uses feedback from the switching control signal generation to adjust the power amplifier output dynamically. The output power control is synchronized with antenna switching operations, creating a feedback mechanism that suppresses spurious signals by compensating for discontinuities in real-time
2Reliability
If antenna switching is performed frequently to maintain BLE connectivity, then communication reliability is improved, but spurious signals increase due to switching discontinuity
Solution Approach 1:
The control circuit performs output power control of the power amplifier in advance when generating a switching control signal for antenna switching. By preliminarily adjusting the power amplifier output according to the switching timing, the discontinuity caused by high-speed antenna switching is suppressed, thereby reducing spurious signal generation while maintaining power consumption benefits
Data Source
AI summary
A transmission apparatus according to an embodiment includes a power amplifier, an antenna switch, and a control circuit. The power amplifier amplifies and outputs a transmission signal. The antenna switch switches, among at least two or more antennas, an antenna configured to output the transmission signal from the power amplifier. The control circuit performs output power control of the power amplifier when the control circuit outputs to the antenna switch a switching control signal for switching the antenna.