Circuit having multiple cascode amplifiers

The LNTA with four cascode amplifiers in RF receivers addresses efficiency and complexity issues by eliminating tank circuits and transformers, using capacitive matching, and providing a differential current mode output to enhance performance across multiple frequencies.

WO2026136413A1 Publication Date: 2026-06-25TEXAS INSTRUMENTS INC
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Patent Information

Application Number
PCT/US2025/059917
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2025-03-05
Filing Date
2025-12-16
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing RF receivers face challenges in efficiently handling multiple frequencies and reducing material and semiconductor area usage while minimizing gain loss and intermodulation distortion.

Method used

The implementation of a low noise trans-impedance amplifier (LNTA) with four cascode amplifiers, utilizing P-type and N-type metal oxide semiconductor transistors, coupled in specific configurations to provide a differential current mode output, eliminating the need for a tank circuit and transformer at the output, and using capacitive matching for RF input.

Benefits of technology

This configuration reduces material and semiconductor area, avoids gain loss, and minimizes intermodulation distortion, enabling efficient operation across various frequencies with reduced system complexity.

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Abstract

A system includes a radio frequency (RF) receiver having a low noise trans-impedance amplifier (LNTA) (101). The LNTA is configured to receive a single-ended RF voltage signal and convert the RF voltage signal to a differential current mode signal. Further components in an RF signal chain are configured to receive the differential current mode signal. The LNTA includes cascode amplifiers (N1l, N2, N3, N4, P1, P2, P3, P4).
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