Power Amplifier Bypass Capacitor for Digital ET Efficiency
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Solution Overview
Problem
Power amplifier circuit efficiency degrades in digital ET mode due to supply voltage provision.
Innovation Solution
Incorporating a bypass capacitor with an electrostatic capacity of 1.4 nanofarads or higher between the supply voltage terminal and the power amplifier, allowing the supply voltage to vary across discrete levels, thereby enhancing efficiency beyond that of average power tracking mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If supply voltage is provided to power amplifier circuits in digital ET mode, then the power amplifier can operate with varying voltage levels to improve power efficiency, but the power amplifier circuit efficiency may degrade
Solution Approach 1:
A bypass capacitor is introduced as an intermediary component between the supply voltage terminal and the power amplifier circuit. The capacitor with electrostatic capacity of 100 fF or more acts as a mediator that filters voltage fluctuations and provides local energy storage, enabling the power amplifier to efficiently utilize the varying supply voltage levels in digital ET mode while preventing efficiency degradation
Solution Approach 2:
The invention changes the electrical parameters of the power amplifier circuit by introducing a bypass capacitor with specific electrostatic capacity (100 fF or more). This parameter change modifies the circuit's impedance characteristics and voltage stability, allowing the circuit to maintain high efficiency when operating with varying supply voltage levels in digital ET mode
2Loss of energy
If a bypass capacitor with electrostatic capacity of 100 fF or more is added to the power amplifier circuit, then the power amplifier circuit efficiency is improved, but the device complexity increases
Solution Approach 1:
The invention uses a simple, inexpensive bypass capacitor as a disposable-like component that provides significant efficiency improvement. The capacitor is a basic electronic component that can be easily integrated into the existing circuit without requiring complex design or expensive materials, making the complexity increase minimal while achieving substantial energy efficiency gains
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves power amplifier circuit efficiency in digital ET mode across all channel band widths, particularly at wider band widths, while preventing efficiency reduction at 200 MHz channel band widths.
Implementation Method 1
a first bypass capacitor coupled between ground and a supply voltage path connecting the supply voltage terminal to the power amplifier. The first bypass capacitor has an electrostatic capacity equal to or higher than a specific value
Data Source
AI summary
A power amplifier circuit includes a power amplifier configured to amplify radio-frequency signal, a supply voltage terminal coupled to the power amplifier, and a bypass capacitor coupled between ground and a supply voltage path connecting the supply voltage terminal to the power amplifier. A supply voltage (VDET) is configured to be supplied to the power amplifier through the supply voltage terminal, and the supply voltage (VDET) is configured to vary across multiple discrete voltage levels within a single frame of radio-frequency signals. The first bypass capacitor has an electrostatic capacity equal to or higher than a specific value that is determined to cause the power amplifier circuit with the first supply voltage to have a higher efficiency than a threshold efficiency. In some exemplary embodiments, the bypass capacitor has an electrostatic capacity equal to or higher than 1.4 nanofarads.