Ranko Sredojevic

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This paper presents a system identification technique for generating stable compact models of typical analog circuit blocks in radio frequency systems. The identification procedure is based on minimizing the model error over a given training data set subject to an incremental stability constraint, which is formulated as a semidefinite optimization problem.(More)
Digital push-pull impedance-modulating (RM) pre-emphasis driver overcomes the power overhead of equalization in voltage-mode (VM) drivers, improving the output stage efficiency ∼2–3x. A compact, fully-digital RAM-DAC implementation with pattern lookup compensates both duty-cycle distortion and driver nonlinearity, while providing a(More)
This paper analyzes the energy efficiency of different transmit equalizer driver topologies. Dynamic impedance modulation is found to be the most energy-efficient mechanism for transmit pre-emphasis, when compared with impedance-maintaining current and voltage-mode drivers. The equalizing transmitter is implemented as a digital push–pull(More)
Connecting system-level performance models with circuit information has been a long-standing problem in analog/mixed-signal front-ends, like radios and high-speed links. High-speed links are particularly hard to analyze because of the complex interplay of device/circuit parasitics and channel filtering operation. In this paper we introduce(More)
In this work we aim to strike a balance between performance, power consumption and design effort for complex digital signal processing within the power and size constraints of embedded systems. Looking across the design stack, from algorithm formulation down to accelerator microarchitecture, we show that a high degree of flexibility and design reuse can be(More)
Sophisticated algorithms for control, state estimation and equalization have tremendous potential to improve performance and create new capabilities in embedded and mobile systems. Traditional implementation approaches are not well suited for porting these algorithmic solutions into practical implementations within embedded system constraints. Most of the(More)
Integrated Systems Group is focused on several key design aspects of modern integrated systems. The group is focused on building cutting edge, energy-efficient integrated systems through vertical optimization encompassing communications and signal processing algorithms and architectures, and digital and mixed-signal circuits. The main research topics(More)
This paper presents a system identification technique for generating stable compact models of typical analog circuit blocks in radio frequency systems. The identification procedure is based on minimizing the model error over a given training data set subject to an incremental stability constraint, which is formulated as a semidefinite optimization problem.(More)
Throughput and energy-efficiency of high-speed chip-to-chip interconnects present critical bottlenecks in a whole range of important applications, from processor-memory interfaces, to network routers. These links currently rely solely on complex equalization techniques to maintain the bit error rate lower than 10-1. While applicable to data rates up to 10(More)
The demand for bandwidth in chip-to-chip communication has been increasing as the industry demands higher quantity and quality of information. Serial links provide a suitable architecture for this kind of transmission, because of speed, power and area limitations on parallel links. However, due to inter-symbol interference (ISI) and channel discontinuities,(More)