High precision power-on-reset circuit with an adjustable trigger level

US7847606B2 · kind B2 · utility

Assignee

• TEXAS INSTRUMENTS DEUTSCHLAND GMBH · DE

Inventors

• Ingo Hehemann · Duisburg, DE
• Kwet Chai · Freising, DE
• Michael Wendt · Günzburg, DE

Key dates

• Filing date: Mar 27, 2009
• Grant date: Dec 7, 2010
• Expiry date: Jun 3, 2029

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03K17/223
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

An electronic device comprising circuitry for providing a Power-on-Reset (POR) signal as a function of a supply voltage level of the circuitry. The circuitry comprises a Vbe-cell or a Vgs-cell comprising a first current path including a first transistor and a second current path including a second transistor. Each transistor has a control terminal for controlling a first current in the first current path and a second current in the second current path, wherein a control voltage level is commonly applied to the control terminals of the first and the second transistor. The control voltage level is derived from the current supply voltage level of the circuitry, and the circuitry further comprises a POR output node for providing a POR output signal, which changes from a first state to a second state in response to the ratio of the magnitudes of the first current and the second current.