A 200-MHz quadrature digital synthesizer/mixer in 0.8-μm CMOS

Tan, Loke Kun; Samueli, H.

doi:10.1109/cicc.1994.379766

Cited by 6 publications

(10 citation statements)

References 7 publications

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“…El diagrama en bloques del modulador QAM con salidas en fase y cuadratura se muestra en la Fig 1 con salidas de la forma (1) y (2) Donde I(n) y Q(n) son los símbolos de datos conformados e interpolados en fase y cuadratura [4], y al realizar una implementación directa de estas salidas, se requiere un total de cuatro multiplicaciones reales y dos sumas reales como lo muestra la …”

Section: Diseño Del Moduladorunclassified

MODEM CORDIC 16qAM en FPGA para satélites Cognitivos

Hoyos

Orozco

2012

Iteckne

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Resumen-En este artículo se presentan los algoritmos de implementación para el modulador y demodulador en cuadratura 16 qAM como funciones SDR sobre Dispositivos Lógicos Programables, particularmente para plataformas FPGA. Se presenta el análisis del modelo, diseño e implementación del mismo, así como los resultados obtenidos pensando en la implantación del dispositivo como un componente de un transpondedor satelital cognitivo. El proceso de validación de la implementación se efectuó a través de las herramientas de diseño, simulación, síntesis y descarga de Xilinx sobre la FPGA Spartan 3E.Palabras clave-Radio Definido por Software, qAM, Transpondedores Reconfigurables, CORDIC, FPGA, DSP, satélite.Abstract-This paper presents the implementation algorithms for quadrature modulator and demodulator 16 qAM as SDR functions on programmable logic devices, particularly for FPGA platforms. It presents all the model analysis, design and implementation of it, and considering the results of implantation of the device as a component of a cognitive satellite transponder. The validation process of the implementation was done through the design tools, simulation, synthesis, and downloads on Xilinx Spartan 3E FPGA.

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Section: Diseño Del Moduladorunclassified

MODEM CORDIC 16qAM en FPGA para satélites Cognitivos

Hoyos

Orozco

2012

Iteckne

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“…A well-known technique of ROM compression is to store only tc/2 radian of sine function, and to generate the complete period of sine wave by exploiting the quarterwave symmetry. The two most significant phase bits are used to decode the quandrant, while the remaining bits are used to address a one-quandrant sine lookup For applications where quadrature outputs are desired, one can take advantage of the eighth symmetry of a sine and cosine waveform to compress the ROM lookup tables [11]. Specifically, only 0~rt/4 radiant of the sine function and 0~TE/4 radiant of the cosine function are stored in two separate ROM's.…”

Section: Exploitation Of Waveform Symmetrymentioning

confidence: 99%

“…The first term is monotonie and can be realized as a coarse nonlinear sine wave DAC by using the nonlinear DAC implementation technique discussed in [8] [9]. The corresponding DAC cell output values can be found according to the formula of (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). Since the total number of bits for a and (3 is less than j-2 bits, the total number of coarse nonlinear DAC cells will be much less than 2 J_I , and hence, the coarse DAC will be much smaller than the original The SFDR of the DDFS using this nonlinear interpolation technique will be presented later in Chapter 6.…”

Section: Chapter 5 Nonlinear Interpolation Technique For Segmented Nomentioning

confidence: 99%

“…The modified accumulator is shown inFigure 3.4. An additional D-type Flip-Flop (DFF) and an inverter areconnected to provide toggling output between one and zero for the carry input of Max{Ç"" st }=x2 Bl -> =it2-u ' x(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) resolution increases. In order to prevent F r values that would lead to gcd (F r , 2 B ) = 2 8-1 , one straightforward solution is to use only odd values of F r .…”

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Design techniques for low-power wide-band direct digital frequency synthesizers of spread spectrum communication applications

Jiang

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This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer.The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction..In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion.Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand corner and continuing from left to right in equal sections with small overlaps.

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“…The modulation capabilities [5] of this chip include frequency modulation, phase modulation, quadrature amplitude modulation, and frequency mixing. Frequency modulation is performed directly by modulating the Frequency Control Word.…”

Section: Modulation Capabilitiesmentioning

confidence: 99%

High-performance all-digital quadrature frequency synthesizer/mixer

Tang

Wang

Min

The 2002 45th Midwest Symposium on Circuits and Systems, 2002. MWSCAS-2002.

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In this paper, a high-performance all-digital quadrature frequency synthesizer/mixer applied to QAM modulation and demodulation is presented, which synthesizes 12-bit sine and cosine waveforms with a spectral purity of -83.0dB. The synthesizer covers a bandwidth from dc to 100 MHz in steps of 0.0466Hz with a corresponding switching speed of 5 ns at 200MHz clock frequency. Also, it is capable of frequency, phase and quadrature amplitude modulation. In this design, an efficient ROM look-up table method for calculating the sine and cosine function is employed, and a compression algorithm that only calculates one-eighth sine function is adopted to reduce the volume of ROM. By taking advantage of sine and cosine symmetries, the size of the ROM look-up table is only 1/51 of that of traditional one. The resulting chip fabricated in 0.35um five-level metal CMOS process has a complexity of about 20,000 gates with core area of 2.00 1.00 mm 2 .

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A 200-MHz quadrature digital synthesizer/mixer in 0.8-μm CMOS

Cited by 6 publications

References 7 publications

MODEM CORDIC 16qAM en FPGA para satélites Cognitivos

MODEM CORDIC 16qAM en FPGA para satélites Cognitivos

Design techniques for low-power wide-band direct digital frequency synthesizers of spread spectrum communication applications

High-performance all-digital quadrature frequency synthesizer/mixer

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