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A CMOS peak detector for 1-60 GHz RF applications is presented. This peak detector tracks the output voltage of a LNA/VCO and the measured signal is used to tune the LNA/VCO to the desired frequency. Different peak detector circuit topologies are analyzed and their performance metrics such as gain, bandwidth and nature of response are compared. The peak detectors were designed for low (2.4 GHz) and...
With the advent of multiple supply domains on a single chip, issues related to power sequencing are becoming a major hurdle for system designers. Existing POR strategies fail to cope up with these issues. We propose a scheme in which the power on reset generation is independent of the sequence of supply ramp-up. The circuit implementation of the proposed methodology has been realized for a dual supply...
A digital clock frequency doubler capable of handling large variation in input duty cycle and PVT (process, voltage and temperature) is presented. Unlike the conventional clock frequency doublers, the proposed circuit doesn't require 50% duty cycle for doubling the input clock frequency and consumes lower silicon area. A digital algorithm is used to generate output frequency and an inbuilt PVT compensation...
Previous studies led to the suggestion that a sub class of hydrocarbon carcinogens have the capacity of damage DNA and evade normal cellular defence mechanisms. To examine the ability of hydrocarbon carcinogens to induce p53 transcriptional activity in normal tissues, we have used transgenic mice in which LacZ transgene is driven by a p53 response element. We demonstrate that transcriptionally active...
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