Susana Patón

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A wide-bandwidth continuous-time sigma-delta ADC is implemented in a 0.13-/spl mu/m CMOS. The circuit is targeted for wide-bandwidth applications such as video or wireless base-stations. The active blocks are composed of regular threshold voltage devices only. The fourth-order architecture uses an OpAmp-RC-based loop filter and a 4-bit internal quantizer(More)
This work presents a system level model of the clock jitter influence in certain types of continuous time sigma delta modulators. The model helps the design of such modulators by speeding up the simulations, predicting analytically the SNR degradation and providing a practical way to minimize the jitter sensitivity of the modulator. Simulations and(More)
The ADC shown in this paper uses an innovative sigma-delta (SigmaDelta) architecture that replaces the flash quantizer and mismatch corrected DAC of a multibit continuous time (CT) modulator by a time domain encoder similar to a PWM modulator to reduce the effective ADC area. The modulator achieves the resolution of a multibit design using single bit(More)
A novel discrete time cascaded sigma-delta modulator topology is presented. The overall noise transfer function (NTF) may be modified by means of an additional error feedback in the analog circuitry. Mismatch properties do not depend on the additional feedback path, and therefore the signal to noise ratio (SNR) may be improved by proper location of NTF(More)
A wide bandwidth continuous time sigma-delta ADC implemented in a 0.13 /spl mu/m CMOS technology is introduced. Active blocks are composed of regular threshold voltage devices only. The circuit is targeted for wide-bandwidth applications such as video or wireless base stations. The fourth-order architecture uses an opamp-RC based loop filter and a 4 bit(More)
This paper shows the operating principle and experimental results of a new continuous-time sigma-delta modulator architecture. The proposed modulator does not require a multibit quantizer nor a mismatch-shaping digital-to-analog converter to produce a multibit noise-shaped output. Instead, its quantizer encodes the loop filter output in a binary signal(More)