Output drive circuit

By designing the feedback network and bias network, the NMOS transistor operates in a critical saturation state, stabilizing the drain-source voltage. This solves the voltage imbalance problem between high-frequency and low-frequency signals in the output drive circuit, improving the reliability and bandwidth of the circuit.

CN121690181BActive Publication Date: 2026-06-09XIAMEN UX IC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAMEN UX IC CO LTD
Filing Date
2026-02-10
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The voltage imbalance between high-frequency and low-frequency signal operating states in the existing output drive circuit causes impedance changes in the NMOS transistor, resulting in a significant increase in the drain-source voltage of the thin oxide layer NMOS transistor, which poses a risk of breakdown and affects circuit reliability.

Method used

By employing a feedback network and a bias network design, the NMOS transistor operates in a critical saturation state, and a stable drain-source voltage is set through a feedback resistor to ensure that the NMOS transistor remains constant at different frequencies, thus avoiding breakdown.

Benefits of technology

It improves the reliability of the output drive circuit, expands the output swing and enhances the bandwidth, ensuring that the NMOS transistor is not broken down at different frequencies.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses an output driving circuit, which comprises an input unit, a multi-stage output unit, a load unit, a feedback network, a bias network and a balance network; the input unit, the multi-stage output unit and the load unit are connected in sequence, the feedback network is connected with the output of the multi-stage output unit, the bias network is connected with the input unit and the multi-stage output unit, and the balance network is connected with the multi-stage output unit. The output driving circuit has the advantages of large output swing, high output bandwidth and good reliability.
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Citation Information

Patent Citations

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