Shared Filter Circuit for Compact Transmit-Receive Chains
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Solution Overview
Problem
Existing wireless interface devices require separate filters for transmit and receive chains, occupying additional space and increasing device size and cost, which is inefficient for higher-frequency wireless standards like 5G and Wi-Fi® 6.
Innovation Solution
A shared filter circuit is implemented between the transmit and receive chains, utilizing a transimpedance amplifier and a biquad filter with time-division multiplexing, along with additional passive poles for bandwidth tuning, and programmable gain amplifiers for isolation, reducing the need for separate components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate filters are used for transmit and receive chains, then filtering performance is maintained, but device size and cost increase
Solution Approach 1:
The patent merges the transmit filter and receive filter into a single shared filter circuit that can be used by both transmit and receive chains. The filter circuit includes an amplifier with a first stage having transmit and receive portions, and a second stage that processes signals from either chain, eliminating the need for separate filters and reducing device area.
Solution Approach 2:
The shared filter circuit is designed to perform multiple functions - it can process both transmit signals and receive signals through the same hardware components. The amplifier stages and filter elements are configured to handle bidirectional signal flow, allowing one filter circuit to replace what would traditionally require two separate filters.
2Reliability
If separate filters are used for transmit and receive chains, then signal isolation is improved, but component quantity and cost increase
Solution Approach 1:
The patent combines multiple filter components into a unified circuit architecture where the same amplifier stages and filter elements serve both transmit and receive paths. This merging reduces the total component count while maintaining isolation through proper circuit configuration and switching mechanisms.
Solution Approach 2:
The shared filter circuit incorporates dynamic switching capabilities that allow the circuit to adapt its configuration based on whether it is processing transmit or receive signals. This dynamic reconfiguration enables the same hardware to provide appropriate signal isolation for different operational modes without requiring separate dedicated components.
Data Source
AI summary
An apparatus is disclosed for sharing a filter circuit between transmission and reception modes. In example aspects, the apparatus includes a wireless interface device. The wireless interface device includes a transmit chain, a receive chain, and a filter circuit. The transmit chain includes a first component and a second component. The receive chain includes a third component and a fourth component. The filter circuit includes an amplifier, and the amplifier includes a first stage and a second stage. The first stage includes a transmit portion coupled to the second stage and a receive portion coupled to the second stage. The transmit portion and the second stage are coupled together in series between the first component and the second component of the transmit chain. The receive portion and the second stage are coupled together in series between the third component and the fourth component of the receive chain.