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A compact and low-power digital-domain noise coupling technique is proposed for higher-order CT DSM implementation, exploiting the architectural advantage of a SAR ADC and a simple digital filter. With an 8b SAR ADC and a second-order digital noise coupling filter, a prototype fourth-order DSM achieves 74.4dB SNDR for 10MHz BW with an OSR of 16 in a 28nm CMOS, showing an FoMs_dr of 174.5dB.
Graphene metadevices and metamaterials are promising especially for the control of THz waves. Among various possible functional devices and materials, THz graphene memory metadevices and THz graphene metamaterial saturable absorbers are introduced as illustrative examples.
We demonstrate a cost effective broadcast signal transmission in a WDM-PON by using directly modulated mutually injected Fabry-Pérot laser diodes (MI F-P LDs) as a low noise broadband light source (BLS). This novel WDM source enables to transmit the 1.25-Gb/s/channel with 100 GHz channel spacing.
We propose a noise suppression method using a feed forward loop for injection seeded WDM-PON to enhance cost effectiveness. By using this method, the required injection power is decreased by 8 dB.
Three-level neutral-point diode-clamped (NPC) multi-level inverter has been known as a superior topology of inverters. However, this topology method has an inherent problem of the neutral point potential variation. In this paper, a simple control scheme based on the unified voltage modulation technique has been proposed to balance the neutral-point voltage of three-level NPC inverter. The proposed...
This paper proposes a design of a variable attenuator based on meta-material structuring and its application. The unit-cell of attenuator, based on the lossy transmission line, consists of the composite right/left-handed transmission line (CRLH-TL) and PIN diodes to control internal loss according to resistance variation of diode. Also, to reduce the initial losses, a parallel connection of PIN diodes...
The DOF (depth of field) of an imaging system is closely related to the pupil function that describes the characteristics of the pupil such as size and shape. Shallow DOF is especially problematic in microscopic optical imaging systems because they have relatively large aperture size for high optical resolution. In this paper, a new DOF extension method is proposed. This is to acquire an image by...
This paper proposes a new modulation scheme for high data rate WBAN in-body communication systems. Simulation results are presented in terms of performance, modulation options, spectrum re-growth due to non-linearity and roll-off values of pulse shaping filter. In addition link budget planning explains that the proposed modulation approach is appropriate for high data rate applications in the body...
There are a few core technologies to enable high-performance 4th generation (4G) broadband wireless communication system. A multiple input multiple output (MIMO) provides high-rate transmission through expended channels by multiple array antennas in both sender and receiver side. Also orthogonal frequency division multiplexing (OFDM) is well-known as the most appropriate technique for high data rate...
A novel ultra -wideband monocycle pulse generation method based on transfer curve of two Mach-Zehnder modulators (MZMs) is proposed. By changing the bias voltage of MZMs, positive and negative polarity monocycle pulse s are generated.
This paper presents modulation classification method capable of classifying incident digital signals without a priori information using WT key features and SVM. These key features for modulation classification should have good properties of sensitive with modulation types and insensitive with SNR variation. In this paper, the 4 key features using WT coefficients, which have the property of insensitive...
We present a 30 W Cartesian feedback transmitter with an efficiency of 40 % and an adjacent channel leakage power ratio (ACLR) of -51 dBc for 859 MHz band pi/4-DQPSK applications. The high efficiency of the system was achieved by a significant efficiency improvement for the final amplifier stage using a load modulation technique. The implemented Cartesian feedback transmitter, using a Doherty power...
This paper proposes a predistortion linearizer using the in-phase modulator. The harmonic generator of the proposed predistorter extracts a second harmonic signal. These signals are divided in-phase and quadrature- phase signals, and then amplifying each signals using variable gain amplifier. An in-phase modulator, modulate fundamental signal with second harmonic signals, generates the predistortion...
Most of the algorithms proposed in the literature deal with the problem of digital modulation classification. This paper discusses the modulation classifiers capable of classifying both analog and digital modulation signals in military and civilian communications applications. A total of 7 statistical signal features are extracted and used to classify 9 modulation signals. In this paper, we investigate...
The slope efficiency of reflective semiconductor optical amplifier (RSOA) depending on the wavelength and power of seeding source are experimentally investigated and a simple control method to compliment the performance variation of RSOA induced by variation of seeding source is proposed.
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