Four-state digital attenuator having two-bit control interface
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United States of America Patent
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-
Aug 31, 2010
Grant Date -
Dec 3, 2009
app pub date -
May 27, 2008
filing date -
May 27, 2008
priority date (Note) -
Expired
status (Latency Note)
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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.
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