Invention Publication
- Patent Title: DIGITAL-TO-ANALOG CONVERTERS WITH TRIODE SWITCHES
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Application No.: US18324035Application Date: 2023-05-25
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Publication No.: US20240113727A1Publication Date: 2024-04-04
- Inventor: Nathan Egan
- Applicant: MediaTek Inc.
- Applicant Address: TW Hsin-Chu
- Assignee: MediaTek Inc.
- Current Assignee: MediaTek Inc.
- Current Assignee Address: TW Hsin-Chu
- Main IPC: H03M1/80
- IPC: H03M1/80 ; H03M1/74

Abstract:
Current steering digital-to-analog converters (DACs) are described. These DACs are suitable for high speed operation. Weight transistors conventionally used in DACs are replaced with resistors, resulting in a lower RC constant. Further, the resistors cause a smaller voltage drop, thus improving the voltage headroom of the DAC. Additionally, the current steering switches are biased in the triode region, as opposed to the saturation region as in conventional designs. Biasing the switches in the triode region results in a smaller drain-source voltage, which further improves the voltage headroom of the DAC. The triode operation further results in a substantially smaller output impedance, which leads to the output voltage being dictated primarily by the output transistor of the current path. Lastly, reset switches are added which reduce data-dependent memory effects that can otherwise produce distortion.
Information query
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