Radio Transmitter Phase Control for Oscillation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power amplifiers in radios exhibit uncontrolled oscillation during start-up and shut-down periods, leading to inefficient power consumption and signal interference.
Innovation Solution
A transmitter design incorporating a delay unit and control unit to manage phase differences between two power amplifier outputs, using digital-to-time converters to control the phase difference from 180° to 0° during ramp intervals, thereby minimizing signal cancellation and optimizing power ramping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power amplifiers are used during start-up and shut-down periods, then transmission signals can be generated, but uncontrolled oscillation occurs leading to signal interference and inefficient power consumption
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the phase difference between the two power amplifier outputs during ramp intervals. The control unit modifies the phase parameter from 180° to 0° during startup and shut-down transitions, which controls the oscillation behavior and eliminates signal interference while maintaining transmission signal generation.
2Duration of action of moving object
If power amplifiers operate during transitions, then transmission can continue, but power consumption becomes inefficient due to uncontrolled oscillation
Solution Approach 1:
The control unit changes the phase parameter of the power amplifier outputs during ramp intervals, transitioning from 180° to 0° phase difference. This parameter change enables continuous transmission operation while controlling the oscillation to improve power consumption efficiency during start-up and shut-down periods.
3Object-generated harmful factors
If phase difference is controlled during ramp intervals, then signal interference is reduced, but device complexity increases due to delay unit and control unit
Solution Approach 1:
The patent introduces a delay unit as an intermediary component that creates the necessary phase difference between the two power amplifier outputs. The control unit acts as another intermediary to manage this phase difference during ramp intervals. These intermediary components enable interference reduction while maintaining a relatively simple overall transmitter structure.
Data Source
AI summary
A transmitter has an antenna port, a delay unit configured to receive and delay a transmit signal by a first phase amount to generate a first transmit signal component and delay the transmit signal a second phase amount to generate a second transmit signal component, a first power amplifier configured to amplify the first transmit signal component to generate a first amplified signal component, a second power amplifier configured to amplify the second transmit signal component to generate a second amplified signal component, a combiner configured to combine the first amplified signal component and the second amplified signal component to generate an output transmit signal at the antenna port, and a control unit configured to control the first phase amount and the second phase amount during a ramp interval to provide a phase difference between the first transmit signal component and the second transmit signal component.