Apparatus and method for asynchronous successive approximation
AssigneeAdvanced Micro Devices, Inc.
InventorMark Luedtke
Life of this patent
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Abstract
A receive signal strength indication analog-to-digital converter includes a digital portion and an analog portion. The digital portion includes structure for approximating radio frequency receive signal strength in digital form and a state machine implementing a successive approximation algorithm. The analog portion includes a digital-to-analog converter, an analog comparator, and structure for transmitting the output of the digital-to-analog converter to the analog comparator. The receive signal strength indication analog-to-digital converter also includes structure for transmitting the approximate radio frequency receive signal strength in digital form to the digital-to-analog converter and structure for transmitting the output of the comparator to the state machine.
Claims6
A receive signal strength indication analog-to-digital converter comprising:
- a digital portion including:
- approximation means for generating a digital approximation of a received analog signal based on a successive approximation feedback signal;
- and
- an algorithm state machine that produces, based upon a compare output signal, the successive approximation feedback signal asynchronously of the received analog signal when an asynchronous mode is enabled;
- an analog portion including:
- a digital-to-analog converter operably coupled to convert the digital approximation into an approximation analog signal;
- and
- an analog comparator operably coupled to compare the approximation analog signal with the received analog signal and to provide the compare output signal to the algorithm state machine;
- a control portion that includes;
- a control state machine operably coupled to the analog portion and the digital portion, the control state machine provides a handshake signal to the digital portion such that the digital portion is notified when the compare output signal is valid and provides control signals to the analog portion and the digital portion to controlling commencement and completion of an analog to digital conversion, and wherein the control state machine operates asynchronously from the algorithm state machine.
A method for performing a successive approximation analog-to-digital conversion, the method comprising the steps of:
- receiving an analog signal to produce a received analog signal;
- executing, based on control information, a successive approximation analog-to-digital conversion of the received analog signal asynchronously to the receiving of the analog signal when in an asynchronous mode;
- and
- generating the control information asynchronously from the executing the successive approximation, wherein the control information indicates commencement and completion of the successive approximation.
Dependencies are inferred from the claim text.