Photonically-enabled RF front-end for wideband flexible down-conversion

Linearity Enhancement Techniques for Wideband Rf Front-end Receivers

iv ACKNOWLEDGEMENTS This thesis would have been impossible without support of many people. I would like to express my sincere gratitude to them, though their invaluable support deserves much more than this short note of appreciation. It is difficult to overstate my gratitude to my advisor Prof. Tamal Mukherjee and Jeyanandh Paramesh. Their enthusiastic and inspirational leadership in research h...

A Tunable Wideband Rf Front-end for Sdr

Today’s direct-conversion SDR platforms are capable of tuning over extremely wide frequency ranges compared to traditional superheterodyne transceiver architectures. However, these radios can suffer from a number of problems due to a lack of front-end RF filtering, including poor dynamic range and desensitization. In this paper, we examine preliminary work on a tunable bandpass filter we are de...

Photonically enabled agile rf waveform generation by optical comb shifting.

We present a photonically enabled rf arbitrary waveform generator that can rapidly switch between two output waveforms. This method is based on line-by-line shaping of an optical comb and then converting the optical pulses to rf waveforms with a fast photodetector. It uses a single diode laser as the optical source and selects different patterns preprogrammed into an optical pulse shaper by shi...

Direct Conversion RF Front-End Implementation for Ultra- Wideband (UWB) and GSM/WCDMA Dual-Band Applications in Silicon-Based Technologies

A 1.57-GHz RF Front-End for Triple Conversion GPS Receiver

A low-power, 1.57-GHz RF front-end for a global positioning system (GPS) receiver has been designed in a 1.0m BiCMOS technology. It consists of a low noise amplifier with 15 dB of gain, a single balanced mixer with 6.3 mS of conversion gm, a Colpitts LC local oscillator, and an emitter coupled logic (ECL) divide-by-eight prescaler. This front-end has a singal sideband (SSB) noise figure of 8.1 ...