RF Circuit Font Routing Replaces Resistor for Impedance Matching
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Solution Overview
Problem
Conventional radio frequency circuits require additional matching circuits and costly adjustments to maintain impedance matching, especially at high frequencies like WIFI 5G, leading to increased manufacturing costs and time due to the need for retesting when removing substituting resistors.
Innovation Solution
A radio frequency circuit with font routing replaces the resistor, utilizing a routing layer and ground layers to achieve equivalent impedance characteristics, allowing the font routing unit to directly substitute the resistor without affecting impedance matching, thereby reducing manufacturing costs and time by eliminating the need for re-adjusting the matching circuit and retesting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a substituting resistor is used in the radio frequency circuit, then the impedance matching and performance are maintained, but the manufacturing cost increases
Solution Approach 1:
The patent extracts the resistor component from the circuit by replacing it with a font routing unit that directly connects pads through controlled impedance traces. This eliminates the need for separate resistor components while maintaining the electrical connection and impedance characteristics, thereby reducing component count and manufacturing cost while preserving impedance matching.
Solution Approach 2:
The patent merges the function of the resistor with the routing trace itself. The font routing unit combines the connection function and impedance control function into a single integrated structure, eliminating the need for separate resistor components and reducing overall circuit complexity and manufacturing cost.
2Ease of manufacture
If the substituting resistor is removed to reduce cost, then the manufacturing cost decreases, but the impedance matching and performance are compromised
Solution Approach 1:
The patent changes the physical parameters of the routing trace (width, length, spacing, layer configuration) to achieve the desired impedance characteristics. By carefully controlling these geometric parameters, the font routing unit achieves equivalent impedance to the original resistor connection, maintaining performance while eliminating the resistor component.
Solution Approach 2:
The patent utilizes multiple routing layers and three-dimensional trace configurations to achieve precise impedance control. By designing the font routing unit across different layers with specific spacing and routing patterns, the equivalent impedance is maintained without requiring separate resistor components.
3Device complexity
If the matching circuit is adjusted to remove the resistor, then the component count decreases, but the manufacturing time and complexity increase due to retesting
Solution Approach 1:
The patent performs preliminary impedance calculation and routing design during the circuit design phase. The font routing unit is pre-designed with calculated trace dimensions and routing patterns that guarantee equivalent impedance characteristics. This preliminary design work eliminates the need for post-assembly adjustments and retesting, reducing manufacturing time while maintaining performance.
Data Source
AI summary
A radio frequency circuit with font routing to replace a resistor includes a routing layer and a ground layer. The routing layer includes a first pad, a second pad and a font routing unit. The second pad is corresponding to the first pad. The font routing unit is connected between the first pad and the second pad, and has a trace width. The trace width is less than a 50 ohm trace width. The ground layer is disposed below the routing layer and is separated from the routing layer by a height. The font routing unit has a second equivalent impedance at the radio frequency, the second equivalent impedance is determined according to the trace width, the height and the radio frequency, and the second equivalent impedance is the same or similar to a first equivalent impedance.