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This paper proposes an analytical model for current integrator with a continuous current input signal, a continuous voltage output signal, with time discrete feedback and sampling. Such an integrator is suited as first integrator within a delta sigma (ΔΣ) modulator performing analog to digital conversion of a current input signal. Capacitive or current feedback can be used for keeping the integrator...
This paper presents a charge redistribution successive approximation A/D-Converter with 14 bit resolution designed in a 0.35 µm CMOS technology. An enhanced self-calibration technique is applied to correct mismatch of the binary weighted capacitors of a fully differential ADC. In contrast to previous presented solutions, no additional digital calculation is permanently necessary during conversion...
This paper presents a current bias circuit for digitally controlled oscillators (DCOs). It consists of three individual current components with different supply voltage and temperature sensitivities and thereby allows to effectively compensate period variations with respect to supply voltage and temperature. This reduces the required fine tuning range for ADPLL application of the DCO. The concept...
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