Dual-Path Phase Shifting Circuit Without Resistive Signal Combining
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Solution Overview
Problem
Existing phase difference dividers in digital modulation systems experience power loss due to signals canceling each other out, leading to inefficiencies in signal transmission.
Innovation Solution
A phase shifting circuit that includes a dividing circuit, first and second phase shifters, and amplifiers to generate signals with a phase difference greater than 0 degrees and less than 90 degrees, reducing power loss by combining amplified signals directly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a resistor is used to combine signals in the phase difference divider, then the circuit can output a signal with desired phase difference, but power loss occurs due to signal cancellation
Solution Approach 1:
The patent removes the resistor from the signal combination path entirely. Instead of using a resistor to combine the in-phase and quadrature signals, the invention directly connects the output terminals of the 90-degree hybrid coupler to the input terminals of the power amplifier, eliminating the source of signal cancellation and power loss while maintaining the desired phase difference functionality
Solution Approach 2:
The patent divides the phase shifting function into two separate signal paths: one path handles the in-phase signal and the other handles the quadrature signal with a 90-degree phase shift. Each path is processed independently through its own amplifier, avoiding the interaction that causes cancellation when signals are combined through a resistor
2Productivity
If signals are combined through a resistor, then phase shifting is achieved, but signal cancellation occurs reducing efficiency
Solution Approach 1:
The harmful resistor element is extracted and removed from the signal path. The direct connection between the hybrid coupler output and power amplifier input eliminates the mechanism causing signal cancellation, thereby improving both transmission efficiency and signal quality without compromise
Data Source
AI summary
A phase shifting circuit includes a dividing circuit that divides an input signal into a first signal and a second signal, the second signal having a phase different from a phase of the first signal; a first phase shifter that shifts the phase of the first signal by a first angle and outputs a first output signal; a second phase shifter that shifts the phase of the second signal by a second angle in a direction opposite to a direction of the first angle and outputs a second output signal, the second output signal having a phase difference that is greater than 0 degrees and less than 90 degrees relative to the first output signal; a first amplifier that amplifies the first output signal and outputs a first amplified signal; and a second amplifier that amplifies the second output signal and outputs a second amplified signal.