Multi-Row Digital Phase Shifter Ground Layout for Stable Phase Shift
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Solution Overview
Problem
The connection of a ground pattern from another circuit to a digital phase shifter can reduce the phase shift quantity of the digital phase shift circuit, especially in multi-row configurations where space constraints are a factor.
Innovation Solution
A digital phase shifter is designed with a multi-row structure where the front row and rear row are connected through a predetermined connection circuit, and the ground pattern is connected to the front row at one point, minimizing interference with the phase shift quantity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If digital phase shift circuits are disposed in a multi-row state to save mounting space, then the area utilization is improved, but the phase shift quantity is reduced due to ground pattern connection interference
Solution Approach 1:
A ground isolation structure is introduced as an intermediary element between adjacent digital phase shift circuits in multi-row configurations. This structure prevents unwanted electromagnetic coupling and ground pattern connection interference, thereby maintaining the intended phase shift quantity while allowing dense multi-row packing of the circuits
Solution Approach 2:
The patent applies different grounding and isolation strategies to different regions of the circuit board. Specifically, ground isolation structures are selectively placed between multi-row digital phase shift circuits, while single-row configurations use standard grounding. This localized approach maintains phase shift precision where needed without unnecessarily complicating the overall design
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
This configuration effectively suppresses the reduction in phase shift quantity due to the connection of the ground pattern, maintaining the desired phase shift performance even in densely packed digital phase shift circuits.
Implementation Method 1
the digital phase shift circuit switches an operation mode between a low delay mode and a high delay mode by switching a return current flowing through the pair of inner lines or the pair of outer lines due to transmission of a signal wave in the signal line according to opening/closing of the pair of NMOS switches
Implementation Method 2
the ground pattern is connected to the front row at one point, minimizing interference with the phase shift quantity
Data Source
AI summary
A digital phase shifter of the present invention is a digital phase shifter in which digital phase shift circuits are cascade-connected, each of the digital phase shift circuits including a signal line, a pair of inner lines provided on both sides of the signal line, a pair of outer lines provided on outer sides of the inner lines, a first ground conductor connected to one ends of the inner lines and one ends of the outer lines, a second ground conductor connected to the other ends of the outer lines, and a pair of electronic switches provided between the other ends of the inner lines and the second ground conductor. The digital phase shift circuits include a multi-row structure constituted by a front row and a rear row, the front row and the rear row are adjacent to each other, and the ground pattern is connected to the front row at one point.