Current mode logic circuits with automatic sink current adjustment
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United States of America Patent
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Sep 30, 2014
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N/A
app pub date -
Sep 29, 2012
filing date -
Sep 29, 2012
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Abstract
Integrated circuit devices may utilize automatic methods for adjusting the tail currents of current mode logic (CML) cells, which compensate for variations in process corners and thereby enable reliable operation of high performance circuits, such as frequency synthesizers. An integrated circuit may include a current mode logic (CML) circuit responsive to at least one input signal and a variable current source electrically coupled to the CML circuit. This variable current source can be configured to sink (or source) a first current from (or to) the CML circuit in response to a control signal. A control circuit may also be provided, which is configured to generate the control signal in response to a process corner indication signal. This process corner indication signal, which may be generated by a process corner detection circuit, preferably has a magnitude that estimates a relative speed of a process corner associated with the integrated circuit device.
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