Byunghoo Jung

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A new design technique that improves operating speed of true single-phase clock-based (TSPC) prescalers is presented. We implement dual-modulus prescalers without using any extra logic gates by exploiting the behavior of the second branch in a TSPC flip-flop. The proposed design technique is applied to ÷2/3 and ÷3/4 prescalers, and their(More)
We present a low-power, low complexity, and wide-dynamic-range universal sensor readout circuit that converts the sensing capacitance or resistance changes to digital duty cycles based on pulsewidth modulation (PWM). The readout circuit utilizes a RC-controlled pulse generator and produces pulse signals whose duration width is proportional to the charging(More)
Energy conservation is essential in wireless sensor networks (WSNs) because of limited energy in batteries. Collaborative beamforming uses multiple transmitters to form antenna arrays; the electromagnetic waves from these antenna arrays can create constructive interferences at the receiver and increase the transmission distance. Each transmitter can use(More)
This paper presents a wide tuning range LC voltage controlled oscillator with a new differential negative resistance cell that uses capacitive source degeneration. Traditional differential negative resistance cells use two transistors where the drains are cross-connected to the corresponding gates and the sources are ac grounded. This structure has a fairly(More)
Blind zone in a phase-frequency detector (PFD) reduces the input detection range and aggravates cycle slips. This brief analyzes the blind zone in latch-based PFDs and proposes a technique that removes the blind zone caused by the precharge time of the internal nodes. With the proposed technique, the PFD achieves a small blind zone close to the limit(More)
A g<sub>m</sub>-boosted resistive feedback low-noise amplifier (LNA) using a series inductor matching network and its application to a 2.4 GHz LNA is presented. While keeping the advantage of easy and reliable input matching of a resistive feedback topology, it takes an extra advantage of g<sub>m</sub>-boosting as in inductively degenerated topology. The(More)
A 43-GHz wireless inter-chip data link including antennas, transmitters, and receivers is presented. The industry standard bonding wires are exploited to provide high efficiency and low-cost antennas. This type of antennas can provide an efficient horizontal communication which is hard to achieve using conventional on-chip antennas. The system uses binary(More)
As operating speeds increase low-loss interconnect structures such as transmission lines become critical in the design of RF and high speed digital circuits. This paper presents a novel low-loss transmission line structure. We discuss the importance of transmission line structures, including coplanar and grounded coplanar structures. Grounded coplanar(More)
A 3-to-5 GHz ultra-wideband (UWB) low-noise amplifier (LNA) with a low-power balanced active balun aiming at IEEE 802.15.4a (Band Group 1) compliance is presented. The LNA employs an NMOS feedback for wideband input matching, and current reuse scheme for reducing power consumption. The active balun uses a differential amplifier with a cascoded cross-coupled(More)