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 disk(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)
Optomechanical systems have enabled wide-band optical frequency conversion and multichannel all-optical radio frequency amplification. Realization of an on-chip silicon communication platform is limited by photodetectors needed to convert optical information to electrical signals for further signal processing. In this paper we present a coupled silicon(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)
This paper presents an analytical model to estimate the motional resistance for partial air gap capacitivelytransduced 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 frequency.(More)
Low phase noise MEMS oscillators necessitate resonators with high f-Q. Resonators achieving high f-Q (mechanical frequency-quality factor product) close to the thermoelastic damping (TED) limit have been demonstrated at expense of feed-through. Here we present a study comparing frequency scaling of quality factors of wineglass and radial modes in a ring(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)