Binary Signal Amplification for Linear Bandpass Power Amplifiers
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Solution Overview
Problem
Current amplifiers for bandpass signals in wireless communication face challenges in achieving a balance between implementation effort, power efficiency, and linearity, particularly in high-frequency applications where existing solutions like switching amplifiers generate distortions and require high hardware complexity.
Innovation Solution
A device that includes a power amplifier and a modulation system to generate a binary input signal by combining the real and imaginary parts of a complex-valued input signal with a carrier signal, followed by a low-pass filter to reconstruct the original signal, reducing out-of-band distortions and maintaining high linearity while minimizing hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a switching amplifier is used to achieve high power efficiency, then power efficiency is improved, but amplitude information is lost and signal distortion occurs
Solution Approach 1:
The signal is pre-modulated into a binary form before amplification, encoding all necessary information in the zero crossings. This preliminary encoding allows the switching amplifier to work with simple binary signals while the original signal can be perfectly reconstructed after amplification through demodulation.
Solution Approach 2:
A binary intermediate signal serves as a mediator between the original analog signal and the amplified output. The modulation device converts the original signal to binary form, the switching amplifier processes this binary signal with high efficiency, and the demodulator reconstructs the original signal from the amplified binary output.
2Loss of energy
If pulse modulation is applied to preserve amplitude information for switching amplification, then power efficiency is improved, but unwanted spectral components are generated
Solution Approach 1:
The system employs feedback through the demodulation process that selectively recovers only the desired frequency band components. The demodulator is designed to extract the original signal from the amplified binary signal while filtering out unwanted spectral components generated during modulation and amplification.
3Manufacturing precision
If a linear amplifier is operated with headroom to avoid distortion, then signal linearity is improved, but power efficiency decreases
Solution Approach 1:
The system changes the parameter domain by transforming the continuous-amplitude signal into a binary parameter domain before amplification. This parameter transformation allows the use of highly efficient switching amplifiers that operate in saturation, while the original signal's information is preserved through the binary encoding and subsequent demodulation process.
Data Source
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AI summary
The invention relates to a method and a device (1) for amplifying an input signal (2), comprising: a power amplifier (3) for amplifying a binary input signal (4), a modulation device (5) for generating the binary input signal (4) based on the input signal (2), the input signal (2) being a complex-valued signal and the binary input signal (4) being a real-valued signal, the modulation device (5) having an adding device (6) which is designed to add the complex-valued input signal ( 2) adding to a complex-valued carrier signal of a predetermined frequency and thus generating a resultant complex-valued signal (8, 9), and wherein the modulation device (5) has a combination device (7) connected downstream of the adding device (6), which is designed to the real-valued binary input from the real part (8) and the imaginary part (9) of the resulting complex-valued signal (8, 9). to generate a signal (4) by combining the real part (8) and the imaginary part (9) of the resulting complex-valued signal (8, 9).