Ad converter and TD converter configured without operational amplifier and capacitor
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United States of America Patent
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Aug 27, 2013
Grant Date -
Nov 15, 2012
app pub date -
May 14, 2012
filing date -
May 14, 2011
priority date (Note) -
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Abstract
An AD converter includes a VT converter circuit part which inputs an analog input voltage and a sampling clock, converts the analog input voltage to a corresponding delay time, and outputs time domain data. A ring oscillator circuit part of N stages inputs the time domain data, and an error propagation circuit part takes out delay information containing a quantization error from phase information of the ring oscillator circuit part of the previous stage, and propagate the delay information to the ring oscillator circuit part of a subsequent stage. A counter circuit part measures a number of waves of an output oscillation waveform of the ring oscillator circuit part of each stage, and an output signal generator part generates an output signal from an output counted value of each counter circuit part. A reset part resets each error propagation circuit part and each counter circuit part with a sampling clock.
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