OPERATIONAL-AMPLIFIER-LESS/CAPACITOR-LESS AD CONVERTER AND TD CONVERTER

摘要

PROBLEM TO BE SOLVED: To provide an operational-amplifier-less/capacitor-less AD converter that implements higher order noise shaping by propagating a quantization error while utilizing a noise shaping characteristic of a GROTDC (Gated Ring Oscillator Time to Digital Converter).

SOLUTION: The operational-amplifier-less/capacitor-less AD converter includes: a VT conversion circuit section for receiving an analog input voltage and a sampling clock, converting the analog input voltage to a corresponding delay time and outputting time domain data; GRO circuit sections in N stages (N is more than one) for receiving the time domain data; error propagation circuit sections each inserted between the preceding GRO and the following GRO to propagate an output oscillation waveform of the preceding GRO including a quantization error; reset sections each for resetting each corresponding error propagation circuit section and counter circuit section on the sampling clock; counter circuit sections each for measuring the number of waves of the output oscillation waveform of each corresponding GRO; and an output signal generation section for generating an output signal from output count values of the counter circuits.

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