Babita R. Jose

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The demand for new telecommunication services requiring higher capacities, data rates and different operating modes have motivated the development of new generation multi-standard wireless transceivers. In multistandard design, sigma-delta based ADC is one of the most popular choices. To this end, in this paper we present cascaded 2-2-2 reconfigurable(More)
Spectrum sensing is an important activity in the Cognitive Radio (CR) scenario. Presence of primary users (PU) over a specific band has to be monitored periodically in each time slots. Spectrum sensing and data communication have to be completed in each time slot. If we can reduce the time required for spectrum sensing, more data can be transmitted in the(More)
The recent trends envisage multi-standard architectures as a promising solution for the future wireless transceivers to attain higher system capacities and data rates. The computationally intensive decimation filter plays an important role in channel selection for multi-mode systems. An efficient reconfigurable implementation is a key to achieve low power(More)
Motivated by the potential of reversible computing, we present a systematic method for the designing reversible arithmetic circuits for finite field or Galois fields of form GF(2m). It is shown that an adder over GF(2m) can be designed with m garbage bits and that of a PB multiplier with 2m garbage bits. To tackle the problem of errors in computation, we(More)
This paper presents a cascaded 2-2-2 reconfigurable sigma-delta modulator that can handle GSM, WCDMA and WLAN standards. The modulator makes use of a low-distortion swing suppression topology which is highly suitable for wide band applications. In GSM mode, only the first stage (2<sup>nd</sup> order &#x2211;-&#x0394; ADC) is turned on to achieve 88dB(More)
This work presents a triple-mode sigma-delta modulator for three wireless standards namely GSM/WCDMA and Bluetooth. A reconfigurable ADC has been used to meet the wide bandwidth and high dynamic range requirements of the multi-standard receivers with less power consumption. A highly linear sigma-delta ADC which has reduced sensitivity to circuit(More)
Over-sampling sigma-delta analogue-to-digital converters (ADCs) are one of the key building blocks of state of the art wireless transceivers. In the sigma-delta modulator design the scaling coefficients determine the overall signal-to-noise ratio. Therefore, selecting the optimum value of the coefficient is very important. To this end, this paper addresses(More)
The modern telecommunication industry demands higher capacity networks with high data rate. Orthogonal frequency division multiplexing (OFDM) is a promising technique for high data rate wireless communications at reasonable complexity in wireless channels. OFDM has been adopted for many types of wireless systems like wireless local area networks such as(More)
Over-sampling sigma-delta analog-todigital converters (ADCs) are one of the key building blocks of state of the art wireless transceivers. In sigma-delta modulator design, the scaling coefficients determine the peak signal-to-noise ratio. Therefore, selecting the optimum value of the coefficient is very important. To this end, this paper addresses the(More)
A dual extended noise shaping based time-interleaved symmetric cross-coupled sigma-delta modulator, which enhances the performance of conventional unextended and extended noise shaping based time interleaved cross-coupled sigma-delta modulator architecture, is proposed in this paper. The N-path first order cross-coupled sigma-delta modulator can attain only(More)