Digital Phase Shifter Grounding Layout for Even Stage Delay
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Solution Overview
Problem
In digital phase shifters, the phase shift quantities across stages are not evenly changed when switching operation modes, leading to loss of even phase shift changes, particularly when one basic unit is set to high-delay mode and others to low-delay mode.
Innovation Solution
A digital phase shifter with a phase shift quantity moderator that includes an extension-grounding line connected to the first grounding conductor and output-grounding lines, where the length from the center of the output signal line to the outer edge of the extension-grounding line is greater than ¼ of each grounding conductor length, and the capacitor and electronic switches are adjusted to match or differ from other digital phase shift circuits to moderate uneven phase shift quantities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital phase shift circuits are connected in cascade to form a digital phase shifter, then the phase shifter can realize multiple phase shift quantities, but the phase shift quantities of the stages are not evenly changed when switching operation modes
Solution Approach 1:
A return current path extension grounding line is introduced as an intermediary element. This grounding line extends the return current path for specific digital phase shift circuits, acting as a mediator to balance the phase shift quantities across stages by providing an additional current path that compensates for the uneven phase shifts.
Solution Approach 2:
The return current path extension grounding line is selectively applied to specific digital phase shift circuits rather than uniformly to all circuits. This local application allows targeted adjustment of phase shift quantities in specific stages, achieving uniformity across the cascade connection while maintaining the ability to control multiple phase shift quantities.
2Adaptability or versatility
If one basic unit is set to high-delay mode and other basic units are set to low-delay mode, then the operation modes can be differentially configured, but the even change of phase shift quantities is lost
Solution Approach 1:
The return current path extension grounding line serves as a compensatory mechanism that mediates the phase shift imbalance caused by differential operation mode configuration. When one basic unit is in high-delay mode and others are in low-delay mode, the extended grounding line provides an additional return path that restores phase shift quantity consistency.
Solution Approach 2:
The return current path extension grounding line is pre-configured to counteract the potential phase shift imbalance before it occurs. By anticipating the uneven phase shift that would result from differential operation mode setting, the extended grounding line is already in place to provide the compensating current path.
Data Source
AI summary
A digital phase shifter includes: a plurality of digital phase shift circuits connected in a cascade manner, wherein each of the plurality of digital phase shift circuits includes a signal line, two inner lines provided on two sides of the signal line, two outer lines provided on outer sides of the inner lines, a first grounding conductor connected to one end of each of the inner lines and the outer lines, a second grounding conductor connected to other ends of the outer lines, and two electronic switches provided between other ends of the inner lines and the second grounding conductor, and is set to a low-delay mode in which return currents flow in the inner lines or a high-delay mode in which return currents flow in the outer lines, and wherein the digital phase shifter includes: a phase shift quantity moderator that moderates unevenness of a phase shift quantity of an uneven digital phase shift circuit of the plurality of digital phase shift circuits, of which the phase shift quantity is uneven with respect to those of other digital phase shift circuits of the plurality of digital phase shift circuits.