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—We will introduce a design of analog-to-digital converters (ADCs) based on digital delay lines. Instead of voltage comparators, they convert the input voltage into a digital code by delay lines and are mainly built on digital blocks. This makes it compatible with process scaling. Two structures are proposed, and tradeoffs in the design are discussed. The… (More)

—We introduce a novel frequency tuning method for high-power terahertz sources in CMOS. In this technique, multiple core oscillators are coupled to generate, combine, and deliver their harmonic power to the output node without using varactors. By exploiting the theory of nonlinear dynamics, we control the coupling between the cores to set their phase shift… (More)

—A wideband frequency multiplier that effectively generates and combines the even harmonics from multiple transistors is proposed. It takes advantage of standing-wave formation and loss cancellation in a distributed structure to generate high amplitude signals resulting in high harmonic power. Wide bandwidth operation and odd harmonic cancellation around… (More)

—A systematic approach to designing high frequency and high power oscillators using activity condition is introduced. This method finds the best topology to achieve frequencies close to the of the transistors. It also determines the maximum frequency of oscillation for a fixed circuit topology, considering the quality factor of the passive components. Using… (More)

Terahertz spectroscopy using silicon technology is gaining attraction for future portable and affordable material identification equipment. To do this, a broad-band THz radiation source is critical. Unfortunately, the bandwidth of the prior CMOS works is not sufficient. In [1], the 300GHz signal source achieves 4.5% tuning range by changing the coupling… (More)

- Ruonan Han, Yaming Zhang, Youngwan Kim, Dae Yeon Kim, Hisashi Shichijo, Ehsan Afshari +1 other
- ISSCC
- 2012

Millimeter and sub-millimeter-wave imaging using solid-state circuits is gaining attention for security and medical applications. To lower cost and increase integration , MOSFETs in CMOS are being investigated for implementing broadband detectors [1-3]. However, neither measured noise-equivalent power (NEP) nor noise floor of the imager was given in [1].… (More)

- E Afshari, H S Bhat, A Hajimiri, J E Marsden
- 2006

We propose a class of electrical circuits for extremely wideband ͑EWB͒ signal shaping. A one-dimensional, nonlinear, nonuniform transmission line is proposed for narrow pulse generation. A two-dimensional transmission lattice is proposed for EWB signal combining. Model equations for the circuits are derived. Theoretical and numerical solutions of the model… (More)