发明授权
US07027278B1 Stacked high-voltage ESD protection clamp with triggering voltage circuit control
有权
堆叠高压ESD保护钳具有触发电压电路控制
- 专利标题： Stacked high-voltage ESD protection clamp with triggering voltage circuit control
- 专利标题（中）： 堆叠高压ESD保护钳具有触发电压电路控制
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申请号： US10897063申请日： 2004-07-22
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公开(公告)号： US07027278B1公开(公告)日： 2006-04-11
- 发明人: Vladislav Vashchenko , Peter J. Hopper , Ann Concannon
- 申请人： Vladislav Vashchenko , Peter J. Hopper , Ann Concannon
- 申请人地址： US CA Santa Clara
- 专利权人： National Semiconductor Corporation
- 当前专利权人： National Semiconductor Corporation
- 当前专利权人地址： US CA Santa Clara
- 代理机构： Stallman & Pollock LLP
- 主分类号： H02H9/00
- IPC分类号： H02H9/00
摘要：
A stacked high-voltage ESD protection clamp is provided that realizes the desired triggering characteristics of a BJT or BSCR stacked snapback clamp. The operational principle of the new circuit is based upon introduction of a middle node capacitor into the stacked (cascoded) clamp. The capacitor (or driver) provides conditions for a two-stage turn-on. At the beginning of an ESD pulse, the capacitor is discharged. With the ESD voltage increase, part of the current is used to charge the capacitor, thus shunting one of the BJTs (BSCRs). As a result, the other BJT (BSCR) will experience fast turn-on. After turn-on, the current provides a fast charge of the capacitor and the turn-on of the second device. Thus, the middle node capacitor allows the triggering characteristics of the clamp to be controlled.
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