Cross-Over Diplexer RF Amplifier for Wideband Harmonic Control
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Solution Overview
Problem
RF signal amplifiers, such as MOSFETs, face challenges in maintaining linearity and reducing spurious harmonic signals when amplifying wide-band RF signals, leading to degradation in gain, power output, and efficiency over wide bandwidths, making it advantageous to design amplifiers that support less than an octave bandwidth.
Innovation Solution
The use of cross-over diplexers to split wide-band RF signals into contiguous sub-bands, which are then amplified by specific amplifiers optimized for reduced bandwidth, and recombined with phase and amplitude equalization to reduce harmonic distortion and improve overall performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RF signal amplifiers are designed to cover a frequency range greater than one octave, then wide bandwidth is achieved, but spurious harmonic signals are emitted due to non-linearities and performance parameters degrade
Solution Approach 1:
The patent divides the wide frequency bandwidth into multiple narrower sub-bands, each less than one octave wide. Separate amplifiers are assigned to each sub-band to operate within their linear regions, avoiding the generation of spurious harmonic signals while collectively covering the full wide bandwidth range.
Solution Approach 2:
The patent introduces diplexers as intermediary components that separate the wide-band input signal into different frequency sub-bands and route them to appropriate amplifiers. The diplexers act as mediators that enable the wideband coverage without requiring a single wideband amplifier that would generate harmonics.
2Adaptability or versatility
If RF signal amplifiers are designed to cover a frequency range greater than one octave, then wide bandwidth is achieved, but gain, power output, and efficiency tend to degrade
Solution Approach 1:
The patent segments the wide bandwidth into multiple narrow sub-bands, allowing each amplifier to be optimized for its specific frequency range. This segmentation enables each amplifier to maintain high gain and power efficiency within its operating range, avoiding the performance degradation that occurs in wideband amplifiers.
Solution Approach 2:
The patent applies local quality by optimizing each amplifier's characteristics for its specific sub-band frequency range. Each amplifier is designed with tailored gain, power output, and efficiency characteristics suited to its assigned frequency range, rather than using a single amplifier design for the entire wide bandwidth.
3Object-generated harmful factors
If cross-over diplexers are used to split wide-band RF signals into contiguous sub-bands, then harmonic distortion is reduced, but device complexity increases
Solution Approach 1:
The patent uses diplexers as intermediary components that perform the frequency separation function. These diplexers are specialized passive components that efficiently divide the wide-band signal into sub-bands with minimal active elements, reducing the overall system complexity compared to using active filtering or multiple complex modulation schemes.
Data Source
AI summary
A technology is described for a wide-band radio frequency amplifier using cross-over diplexers. A first port is configured to receive RF signals in a wide-band RF spectrum. A cross-over diplexer splitter is coupled to the first port. The cross-over diplexer splitter is configured to filter the RF signals in the wide-band RF spectrum into a low frequency (LF) signal having an LF pass-band and a high frequency (HF) signal having an HF pass-band with the LF pass-band crossing the HF pass-band at a cross-over frequency. An HF RF amplifier is configured to amplify the HF signal to form an amplified HF signal. An LF RF amplifier configured to amplify the LF signal to form an amplified LF signal. A cross-over diplexer combiner is configured to combine the amplified HF signal and the amplified LF signal and output amplified RF signals in the wide-band RF spectrum.