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A 13.5b 1.2V micropower extended counting A/D converter
 IEEE J. SolidState Circuits
, 2001
"... Abstract—This work presents a study of the extended counting technique for a 1.2V micropower voiceband A/D converter. This extended counting technique is a blend of 61 modulation with its high resolution but relatively low speed and algorithmic conversion with its higher speed but lower accuracy. ..."
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Cited by 7 (1 self)
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Abstract—This work presents a study of the extended counting technique for a 1.2V micropower voiceband A/D converter. This extended counting technique is a blend of 61 modulation with its high resolution but relatively low speed and algorithmic conversion with its higher speed but lower accuracy. To achieve this, the converter successively operates first as a firstorder 61 modulator to convert the most significant bits, and then the same hardware is used as an algorithmic converter to convert the remaining least significant bits. An experimental prototype was designed in 0.8 m CMOS. With a 1.2V power supply, it consumes 150 W of power at a 16kHz Nyquist sampling frequency. The measured peak ƒ @x C „rhA was 80 dB and the dynamic range 82 dB. The converter core including the controller and all reconstruction logic occupies about I Q I mmP of chip area. This is considerably less than a complete 61 modulation A/D converter where the digital decimation filter would occupy a significant amount of chip area. Index Terms—Analogtodigital, extended counting, low power, low voltage. I.
A 0.6V 82dB DeltaSigma Audio ADC Using SwitchedRC
 Integrators,” IEEE Journal Of SolidState Circuits
, 2005
"... ..."
A 1V 10MHz clockrate 13bit CMOS 16 modulator using unitygainreset opamps
 IEEE J. SolidState Circuits
, 2002
"... Abstract—The problem of lowvoltage operation of switchedcapacitor circuits is discussed, and several solutions based on using unitygainreset of the opamps are proposed. Due to the feedback structure, the opamps do not need to be switched off during the reset phase of the operation, and hence can ..."
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Cited by 4 (4 self)
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Abstract—The problem of lowvoltage operation of switchedcapacitor circuits is discussed, and several solutions based on using unitygainreset of the opamps are proposed. Due to the feedback structure, the opamps do not need to be switched off during the reset phase of the operation, and hence can be clocked at a high rate. A lowvoltage 16 modulator, incorporating pseudodifferential unitygainreset opamps, is described. A test chip, realized in a 0.35 m CMOS process and clocked at 10.24 MHz, provided a dynamic range of 80 dB and a signaltonoise C distortion (SNDR) ratio of 78 dB for a 20kHz signal bandwidth, and a dynamic range of 74 dB and SNDR of 70 dB for a 50kHz bandwidth, with a 1V supply voltage. Index Terms—ADC, chargepump circuits, delta–sigma, low voltage, sigma–delta, switchedcapacitor circuits, switched opamp. I.