TD converter and AD converter with no operational amplifier and no switched capacitor
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United States of America Patent
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Jan 27, 2015
Grant Date -
Nov 21, 2013
app pub date -
May 1, 2013
filing date -
May 19, 2012
priority date (Note) -
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Abstract
A TD converter is provided for digitally converting a delay time value into a digital value. In the TD converter, an oscillator circuit part inputs time domain data. A first-state counter circuit part measures a number of waves of an output oscillation waveform from the oscillator circuit part when time domain data is in a first state, and a second-state counter circuit part measures a number of waves of the output oscillation waveform from the oscillator circuit part when the time domain data is in a second state. An output signal generator part generates an output signal based on output count values of the first-state counter circuit part and the second-state counter circuit part, and a frequency control circuit controls the oscillator circuit part to always oscillate and to control an oscillation frequency of the oscillator circuit part.
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