Multistage Amplifier Pulse Predistortion for Overshoot-Free Signals
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Solution Overview
Problem
Multistage high-frequency transmitter amplifiers often generate pulse signals with undesirable shapes, particularly exhibiting overshoot at the leading edge, leading to poor detection of transmitted pulses, and existing methods fail to provide pulse shaping over a wide dynamic range.
Innovation Solution
The method involves using control signals with definable pulse sections of constant gradient to apply predistortion to each amplifier stage, ensuring the pulse top of the transmitted signal follows a desired shape by shaping a frame pulse with freely selectable sections and converting it to an analog signal, effectively eliminating undesirable pulse courses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional multistage amplifier methods are used, then amplification is achieved, but the pulse shape becomes distorted with overshoot at the leading edge
Solution Approach 1:
The patent applies predistortion to the control signals before they reach the amplifier stages. By pre-shaping the pulse sections with definable constant gradients, the control signals are prepared in advance to counteract the expected distortion that will occur during amplification, resulting in a corrected final pulse shape without overshoot
Solution Approach 2:
The patent modifies the parameters of the control signals by defining pulse sections with specific constant gradients. This parameter change in the control signal shape directly influences the amplifier output, transforming the distorted pulse into one with the desired shape and eliminating harmful overshoot effects
2Adaptability or versatility
If existing pulse shaping methods are used, then some pulse shape control is achieved, but pulse shaping over a wide dynamic range is not provided
Solution Approach 1:
The patent divides the control signal into multiple pulse sections, each with independently definable constant gradients. This segmentation allows precise control of different parts of the pulse waveform, enabling accurate pulse shaping across a wide dynamic range by adjusting individual section parameters
Solution Approach 2:
The patent introduces dynamically adjustable pulse sections with definable constant gradients that can be adapted to different operating conditions. This dynamic control mechanism enables the system to maintain precise pulse shape definition across varying signal levels and wide dynamic ranges
Data Source
AI summary
In a method of generating a pulse-shaped transmitted output signal having a definable pulse shape in a multistage amplifier arrangement, the course of the “pulse top” (upper edge) of the transmitted signal is determined by control signals at the amplifier stages. The control signals of the amplifier stages are definable such that the control signal of an amplifier stage in each case comprises a number of pulse sections of a predefinable frame pulse. The tops of the pulse sections each having a predefinable constant gradient. A predistortion is introduced into the control signals in this manner, having a course which offsets distortion of the pulse top which results when no predistortion is used.