Invention Grant
- Patent Title: Four-state digital attenuator having two-bit control interface
- Patent Title (中): 具有两位控制接口的四态数字衰减器
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Application No.: US12127795Application Date: 2008-05-27
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Publication No.: US07786822B2Publication Date: 2010-08-31
- Inventor: Michael Wendell Vice
- Applicant: Michael Wendell Vice
- Applicant Address: SG Singapore
- Assignee: Avago Technologies Wireless IP (Singapore) Pte. Ltd.
- Current Assignee: Avago Technologies Wireless IP (Singapore) Pte. Ltd.
- Current Assignee Address: SG Singapore
- Main IPC: H01P1/22
- IPC: H01P1/22

Abstract:
A four-state digital attenuator for an RF signal includes a first external terminal adapted to receive a first control voltage; a second external terminal adapted to receive a second control voltage, and a third external terminal connected to a fixed supply voltage. The four-state digital attenuator receives no supply voltages other than the control voltages and the fixed supply voltage connected to the third external terminal. A plurality of series paths are provided from an RF input to an RF output, each of the series paths passing through a node. A plurality of shunt paths are provided from the node to the third external terminal. A driver selectively enables the series paths and shunt paths in response to the first and second control voltages to provide four attenuation levels for an RF signal from the RF input to the RF output.
Public/Granted literature
- US20090295515A1 FOUR-STATE DIGITAL ATTENUATOR HAVING TWO-BIT CONTROL INTERFACE Public/Granted day:2009-12-03
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