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This paper presents a novel technique to extend the bandwidth of oversampled Analog-to-Digital Converters and a method to optimize their design to avoid instability, when oversampling has to be preserved and clock frequency cannot be increased. This proposal allows the converter to increase the resolution only introducing minor circuit modifications when processing input signals in the extended band...
This paper presents a novel technique to extend the bandwidth of oversampled Analog-to-Digital Converters (ADCs) when clock frequency cannot be increased and oversampling has to be preserved. The Signal Transfer Function (STF) of the converter is modified to boost the signal in the extended band. The modification keeps the noise transfer function (NTF) unaffected, and therefore, there is no need of...
This paper presents a time difference amplifier to improve the resolution of cascaded Time Encoded (TE) Analog-to-Digital Converters (ADCs). Time difference amplifiers are employed to increase the resolution of Time-to-Digital Converters, and most of them are based on imposing a certain time offset at the input of an SR latch. They are limited in their gain and input range, and exhibit a large delay...
High-resolution noise shaping ADCs are increasingly used in measurement of biopotential signals. This paper presents a novel low power low voltage ADC based on a Dual-Slope (DS) integrating quantizer. To reduce power consumption, the active RC integrator used in integrating quantizers has been replaced by a passive RC low pass filter. Hence, no operational amplifiers are needed. This simplification...
Nonlinearity is one of the main problems associated with VCO based noise shaping ADCs. Their open loop architecture does not permit correction of the nonlinear voltage to frequency response of the VCO by feedback. Recently, linearization of a VCO ADC by Pulse Width Modulation (PWM) precoding has been proposed. Here, the input signal is encoded by a PWM modulator to drive the VCO with a 2-level signal,...
This work presents an area- and power-efficient realization of a new time-encoding oversampling converter (TEOC) consisting of a third-order continuous time (CT) loop filter and a self-oscillating pulse-width modulator (PWM). The modulator displays similar performance to that of a standard multibit CT- modulator but has the complexity of a single bit design. The time-encoding quantizer...
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