90-Degree Coupler Multiplier Circuit for Wideband Tripled-Wave Output
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Solution Overview
Problem
Existing multiplier circuits with filter circuits, including LC circuits, face difficulties in improving the output of tripled waves in wide bands due to overlapping frequency bands of doubled and tripled waves, making it challenging to effectively extract the tripled wave.
Innovation Solution
A multiplier circuit design incorporating a 90 degrees coupler to divide the input signal into two signals with a 90-degree phase difference, transistors to generate doubled and tripled waves, and a combiner to combine these signals while restraining leakage, thereby enhancing the output of the tripled wave in a wide band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter circuit including an LC circuit is used in the multiplier circuit, then the circuit structure is established, but the output of the tripled wave cannot be improved in a wide band due to overlapping frequency bands
Solution Approach 1:
The input signal is divided into two signals with a 90-degree phase difference using a 90-degree coupler. This segmentation allows the subsequent transistors to generate harmonic components that can be combined to suppress the doubled wave and enhance the tripled wave across a wide frequency band, overcoming the limitations of traditional LC filter circuits.
Solution Approach 2:
The output signals from multiple transistors are combined in a combiner circuit. By merging signals with specific phase relationships, the doubled wave components cancel each other out while the tripled wave components constructively interfere, achieving wideband tripled wave enhancement without requiring LC filters.
2Adaptability or versatility
If the frequency band of the doubled wave overlaps with that of the tripled wave, then the available frequency range is expanded, but it becomes difficult to extract the tripled wave effectively
Solution Approach 1:
The combiner circuit is designed with specific impedance values and phase characteristics that are optimized for different frequency components. By creating local quality differences in the signal paths, the circuit selectively enhances the tripled wave while suppressing the doubled wave, enabling effective extraction even in overlapping frequency bands.
3Productivity
If transistors are used to generate doubled and tripled waves, then the frequency multiplication function is achieved, but leakage between transistors degrades the output quality
Solution Approach 1:
The combiner circuit acts as an intermediary between the transistors and the output. It provides isolation between the transistor stages to prevent signal leakage while simultaneously combining the desired harmonic components. The specific impedance matching and phase control in the combiner ensure high output quality by eliminating unwanted leakage effects.
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
The proposed design effectively suppresses the output of the doubled wave and enhances the output of the tripled wave in a wide band by reducing mutual interference between harmonic components, improving the overall performance of the multiplier circuit.
Implementation Method 1
a 90 degrees coupler that divides an input signal into a first input signal and a second input signal of which phase difference of a frequency of a base wave of the input signal is 90 degrees
Implementation Method 2
a first transistor that receives the first input signal and outputs a first output signal including at least a doubled wave and a tripled wave of the first input signal
Implementation Method 3
a combiner that receives the first output signal and the second output signal, restrains leakage of the first output signal or the second output signal from one of the first transistor and the second transistor to the other
Data Source
AI summary
A multiplier circuit including; a 90 degrees coupler that divides an input signal into a first input signal and a second input signal of which phase difference of a base wave is 90 degrees; a first transistor that receives the first input signal and outputs a first output signal including at least a doubled wave and a tripled wave of the first input signal; a second transistor that receives the second input signal and outputs a second output signal including at least a doubled wave and a tripled wave of the second input signal; and a combiner that restrains leakage of the first output signal or the second output signal from one of the first transistor and the second transistor to the other, combines the first output signal and the second output signal, and outputs an output signal of the tripled wave.