Invention Grant
- Patent Title: Analog switch with a low flatness operating characteristic
- Patent Title (中): 具有低平整度工作特性的模拟开关
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Application No.: US12633777Application Date: 2009-12-08
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Publication No.: US08054122B2Publication Date: 2011-11-08
- Inventor: Dianbo Guo
- Applicant: Dianbo Guo
- Applicant Address: SG Singapore
- Assignee: STMicroelectronics Asia Pacific Pte Ltd (SG)
- Current Assignee: STMicroelectronics Asia Pacific Pte Ltd (SG)
- Current Assignee Address: SG Singapore
- Agency: Gardere Wynne & Sewell LLP
- Agent Andre M. Szuwalski
- Main IPC: H03L5/00
- IPC: H03L5/00

Abstract:
An analog switch includes a transistor whose source connected to a signal input and whose drain is connected to a signal output. An output of a gate control circuit is connected to the transistor gate. A first input of the gate control circuit is connected to the source of the transistor. The gate control circuit responds to a logic transition of an enable signal received at a second input by pre-charging a substantially constant gate-to-source voltage across the transistor. This voltage is stored by a gate-to-source connected capacitor. In one steady-state logic condition of the enable signal, the gate control circuit operates to turn off the transistor. In another steady-state logic condition of the enable signal, the gate control circuit permits the signal received at the signal input to drive the gate of the transistor with a voltage offset by the substantially constant gate-to-source voltage stored on the capacitor.
Public/Granted literature
- US20110133813A1 ANALOG SWITCH WITH A LOW FLATNESS OPERATING CHARACTERISTIC Public/Granted day:2011-06-09
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