Siddharth G. Tallur

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— We build upon and derive a precise far from carrier phase noise model for radiation pressure driven opto-mechanical oscillators and show that calculations based on our model accurately match published phase noise data for such oscillators. Furthermore, we derive insights based on the equations presented and calculate phase noise for an array of coupled(More)
Cavity opto-mechanics enabled radiation pressure (RP) driven oscillators shown in the past offer an all optical Radio Frequency (RF) source without the need for external electrical feedback. However these oscillators require external tapered fiber or prism coupling and non-standard fabrication processes. In this work, we present a CMOS compatible(More)
— This paper presents an analytical model to estimate the motional resistance for partial air gap capacitively-transduced MEMS resonators. This model serves as a link between the well formulated analytical models for conventional air gap and internal dielectric transduction schemes, thereby helping decide which scheme is optimal for a given design(More)
We present a silicon opto-acoustic oscillator operating at 2.05GHz with signal power +18dBm and phase noise –80dBc/Hz at 10kHz offset from carrier. We employ displacement amplification and partial air gap capacitive transduction to enhance the transduction efficiency. Built-in nonlinear opto-mechanical modulation provides noiseless upconversion of the(More)
In this paper we present the design and the measured results for a FCC-compliant UWB impulse transmitter (Tx) designed to operate in the 3-5GHz range. The transmitter uses a fast start-up, duty-cycled, current-starved ring-oscillator topology. A triangular pulse-shaping technique is utilized for spectrum-shaping to facilitate FCC compliance. The designed(More)
This paper presents a driving scheme for silicon opto-acoustic oscillators (OAO) by simultaneously exploiting radiation-pressure (RP) and RF feedback oscillation mechanisms to achieve significantly lower phase noise than could be realized by either phenomenon solely. A theoretical model and experimental results are presented corroborating this scheme,(More)