Band Selection Switch Circuit With Dynamic Impedance Compensation
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Solution Overview
Problem
Existing amplifier circuits fail to appropriately match impedances for high band power class 2 (PC2) and low band power class 3 (PC3) communication standards, leading to mismatch losses and increased voltage standing wave ratio (VSWR) due to fixed capacitance and inductance values, which affect signal transmission.
Innovation Solution
A band selection switch circuit with an impedance compensation circuit, including a signal port switch and an impedance port switch, controlled by a switching control circuit to selectively connect ports and adjust impedance based on power modes and communication bands, utilizing an inductance element with values determined for relevant communication bands to improve impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed capacitance and inductance values are used in the impedance matching circuit, then the circuit structure is simple, but impedance matching cannot be achieved for both high band power class 2 and low band power class 3
Solution Approach 1:
The patent applies dynamics by making the impedance matching circuit adjustable through switching elements. The impedance matching circuit includes capacitors and inductors that can be selectively connected or disconnected based on the operating power class, transforming a static fixed-value circuit into a dynamic adjustable circuit that adapts to different impedance requirements for high band power class 2 and low band power class 3
Solution Approach 2:
The patent segments the impedance matching circuit into multiple independent capacitor and inductor elements that can be selectively activated. Instead of using single fixed-value components, the circuit is divided into multiple segments (C1, C2, L1, L2, etc.) that can be independently connected to the signal line based on the required power class, enabling flexible impedance adjustment
2Reliability
If separate impedance matching circuits are designed for high band power class 2 and low band power class 3, then impedance matching is optimized for each power class, but the overall device complexity increases
Solution Approach 1:
The patent creates a universal impedance matching circuit that can serve both high band power class 2 and low band power class 3 requirements. By incorporating switching elements controlled by a control signal, a single impedance matching circuit structure performs multiple functions - adjusting impedance for different power classes - eliminating the need for separate dedicated circuits for each power class
3Ease of operation
If the band selection switch only connects signal ports without impedance port switching, then the device complexity is reduced, but impedance mismatches cause insertion loss and poor VSWR
Solution Approach 1:
The patent introduces an impedance port switch as an intermediary element between the signal path and the impedance matching circuit. This intermediary component enables selective connection of impedance matching elements based on the operating power class, mediating between the simple switch structure and the requirement for impedance matching by dynamically activating the appropriate matching components
Data Source
AI summary
A band selection switch circuit for an amplifier with an impedance matching circuit includes a band selection switch and an impedance compensation circuit. The band selection switch includes a signal port switch configured to selectively connect to one of a common transmit port, transmit and receive (TxRx) ports, and receive ports, and an impedance port switch configured to selectively connect the common transmit port and one of the receive ports and an impedance port. The impedance compensation circuit includes an impedance element connected to the impedance port.