National Chi Nan University

www.ncnu.edu.tw/
Nantou, Taiwan

National Chi Nan University is located in the town of Puli, Nantou County, Taiwan. Wikipedia.

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Patent
National Chi Nan University | Date: 2016-11-23

A down-conversion mixer includes a trans conductance unit, a resonant unit and a mixing unit. The transconductance unit converts a differential input voltage signal pair into a differential input current signal pair. The resonant unit provides a negative resistance and a differential auxiliary current signal pair. The mixing unit mixes a combination of the differential input current signal pair and the differential auxiliary current signal pair with a differential oscillatory voltage signal pair to generate a differential mixed voltage signal pair.


Patent
National Chi Nan University | Date: 2016-11-01

A voltage-controlled oscillator includes two first inductors having a common node, two varactors respectively coupled to the first inductors, a cross-connected pair coupled to the first inductors, and a reversely tunable source degeneration module coupled to the cross-connected pair. The reversely tunable source degeneration module cooperates with the cross-connected pair to form a negative equivalent capacitance seen into the cross-connected pair from the common node of cross-connected pair and each first inductor. An oscillatory signal pair is provided at the first terminals of the first and second transistors.


Patent
National Chi Nan University | Date: 2016-11-01

A mixer includes a trans conductance unit, a gain boost unit, a mixing module and a buffer. The trans conductance unit, the gain boost unit and the mixing module cooperatively mix a differential input voltage signal pair with a differential oscillatory voltage signal pair to generate a differential mixed voltage signal pair. The buffer performs buffering on the differential mixed voltage signal pair, and has inductance that cooperates with parasitic capacitance at output terminals thereof to form an LC tank circuit that reaches resonance at a frequency of the differential mixed voltage signal pair to behave as an open circuit.


Patent
National Chi Nan University | Date: 2016-08-21

A double frequency-shift keying modulating device includes a modulation module. The modulation module receives an oscillating signal and a digital signal, and generates a modulation output signal that has a first frequency. The first frequency is associated with a frequency of the oscillating signal and varies periodically at a second frequency. The second frequency is associated with the digital signal and the frequency of the oscillating signal.


Patent
National Chi Nan University | Date: 2016-03-24

A balanced up-conversion mixer includes: a load circuit permitting a differential radio frequency (DRF) current signal pair (SP) to flow out and outputting a DRF voltage SP based on its impedance, a DC bias voltage and the DRF current SP; a mixing circuit allowing the DRF current SP to flow thereinto based on a differential intermediate frequency voltage SP, a differential oscillating voltage SP generated based on an oscillating voltage signal by a single-ended to differential conversion circuit, and first and second currents generated by a negative resistance compensation circuit based on a DC bias voltage; and a signal amplifier circuit amplifying the DRF voltage SP to generate a differential output voltage SP.


Wei C.-C.,National Chi Nan University
Optics Letters | Year: 2011

This work presents a small-signal analysis for investigating the transmission performance of optical orthogonal frequency division multiplexing signals with a directly modulated DFB laser (DML). The analysis shows the positive chirp of DMLs can intensify power fading after transmission with positive dispersion and provide power gain instead with negative dispersion. The power of subcarrier-to-subcarrier intermixing interference after squarelaw direct detection, however, is independent on the sign of dispersion. © 2011 Optical Society of America.


A balun includes a first transmission line and a number (N) of second transmission lines. The first transmission line includes an end terminal for receiving or outputting a signal with a target wavelength, and having a length of half the target wavelength. Each of the second transmission lines is disposed adjacent to and spaced apart from the first transmission line so as to establish electromagnetic coupling therebetween, and includes first and second end terminals for cooperatively outputting or receiving a differential signal pair with the target wavelength.


Patent
National Chi Nan University | Date: 2015-02-18

A power amplifier includes a plurality of power amplification modules, each of which includes an input terminal and an output terminal. Equivalent input impedances seen respectively into the power amplification modules from the input terminals thereof are the same, and equivalent output impedances seen respectively into the power amplification modules from the output terminals thereof are the same. The input terminals of the power amplification modules are coupled together for receiving an input signal. The output terminals of the power amplification modules are coupled together for outputting an output signal. Each of the power amplification modules amplifies a portion of a power of the input signal to obtain a portion of a power of the output signal.


Patent
National Chi Nan University | Date: 2015-12-09

A voltage-controlled oscillator includes two first inductors having a common node, two varactors receiving a first bias voltage and respectively coupled to the first inductors, first and second transistors each having a first terminal coupled to a respective one of the varactors, and two second inductors. One of the second inductors is coupled between the control terminal of the first transistor and the first terminal of the second transistor. The other second inductor is coupled between the control terminal of the second transistor and the first terminal of the first transistor. An oscillatory signal pair is provided at the first terminals of the first and second transistors.


Patent
National Chi Nan University | Date: 2015-06-30

A mixer includes a transconductance unit, a gain boost unit, a mixing module and a buffer. The transconductance unit converts a differential input voltage signal pair into a differential input current signal pair. The gain boost unit generates an auxiliary current signal pair that constitutes a portion of the differential input current signal pair. The mixing module mixes a remaining portion of the differential input current signal pair with a differential oscillatory voltage signal pair to generate a differential mixed voltage signal pair. The buffer performs buffering on the differential mixed voltage signal pair.

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