共查询到20条相似文献,搜索用时 15 毫秒
1.
Frappe A. Flament A. Stefanelli B. Kaiser A. Cathelin A. 《Solid-State Circuits, IEEE Journal of》2009,44(10):2722-2732
An all-digital RF signal generator using DeltaSigma modulation and targeted at transmitters for mobile communication terminals has been implemented in 90 nm CMOS. Techniques such as redundant logic and non-exact quantization allow operation at up to 4 GHz sample rate, providing a 50 MHz bandwidth at a 1 GHz center frequency. The peak output power into a 100 Omega diff. load is 3.1 dBm with 53.6 dB SNDR. By adjusting the sample rate, carriers from 50 MHz to 1 GHz can be synthesized. RF signals up to 3 GHz can be synthesized when using the first image band. As an example, UMTS standard can be addressed by using a 2.6 GHz clock frequency. The measured ACPR is then 44 dB for a 5 MHz WCDMA channel at 1.95 GHz with output power of -16 dBm and 3.4% EVM. At 4 GHz clock frequency the total power consumption is 120 mW (49 mW for DeltaSigma modulator core) on a 1 V supply voltage, total die area is 3.2 mm2 (0.15 mm2 for the active area). 相似文献
2.
Hyungseok Kim Junghan Lee Copani T. Bazarjani S. Kiaei S. Bakkaloglu B. 《Solid-State Circuits, IEEE Journal of》2009,44(10):2766-2779
An adaptive blocker-rejection wideband continuous-time (CT) sigma-delta (SigmaDelta) analog-to-digital converter (ADC) is presented. An integrated blocker detector reconfigures the ADC loop architecture to avoid overloading in the presence of strong interferers, improving receiver channel selectivity and sensitivity without increasing its dynamic range (DR) requirements. The adaptive operation relaxes receiver baseband channel filtering requirements for a worldwide inter-operability for microwave access (WiMAX, IEEE 802.16e) receiver. The ADC achieves 71 dB of dynamic range (DR), 65 dB of peak SNDR and 68 dB of peak SNR over a 10 MHz signal bandwidth, consuming 18 mW from a 1.2 V supply. The ADC system reconfigures the loop filter topology within 51 mus, improving receiver selectivity without any transient impact on BER. In the blocker suppression mode, the ADC can withstand 30 dBc blocker at the adjacent channel, achieving - 22 dB error vector magnitude (EVM) with a 24 Mb/s 16-QAM signal. The IC is fabricated on a 130 nm 8-level metal, metal-insulator-metal (MIM) capacitor, CMOS technology, occupying 1.5 times 0.9 mm2 silicon area. 相似文献
3.
《Microwave and Wireless Components Letters, IEEE》2008,18(12):824-826
4.
《Solid-State Circuits, IEEE Journal of》2009,44(6):1697-1708
5.
Yung-Nien Jen Jeng-Han Tsai Chung-Te Peng Tian-Wei Huang 《Microwave and Wireless Components Letters, IEEE》2009,19(1):42-44
A 20-24 GHz, fully integrated power amplifier (PA) with on-chip input and output matching is realized in 0.18 mum standard CMOS process. By cascading two cascode stages, the PA achieves 15 dB small signal gain, 10.7% power added efficiency, 16.8 dBm output saturation power and high power density per chip area of 0.137 W/mm2, which is believed to be the highest power density to our knowledge. The whole chip area with pads is 0.35 mm2, which is the smallest one compared to all reported paper. 相似文献
6.
With the rapid evolution of wireless standards and increasing demand for multi-standard products, the need for flexible RF and baseband solutions is growing. Flexibility is required to be able to adapt to unstable standards and requirements without costly hardware re-spins, and also to enable hardware reuse between products and between multiple wireless standards in the same device, ultimately saving both development cost and silicon area. In this paper a fully programmable baseband processor suitable for standards such as DVB-T/H and mobile WiMAX is presented. The processor is based on the SIMT architecture which utilizes a unique type of vector instructions to provide processing parallelism while minimizing the control complexity of the processor. The architecture has been demonstrated in a prototype chip which was proven in a complete DVB-T/H system demonstrator. The chip occupies 11 mm2 in a 0.12 mum CMOS process. It includes 1.5 Mbit of single port SRAM and 200 k logic gates. The measured power consumption for the highest DVB-T/H data rate (31.67 MBit/s) is 70 mW at 70 MHz. This outperforms both area and power figures of previously presented non-programmable DVB-T/H solutions. 相似文献
7.
Hangai M. Hieda M. Yunoue N. Sasaki Y. Miyazaki M. 《Microwave Theory and Techniques》2010,58(1):41-47
8.
180$^{circ}$ and 90$^{circ}$ Phase Shifting Networks With an Octave Bandwidth and Small Phase Errors
《Microwave and Wireless Components Letters, IEEE》2009,19(8):506-508
9.
《Solid-State Circuits, IEEE Journal of》2009,44(3):883-890
10.
《Solid-State Circuits, IEEE Journal of》2009,44(9):2356-2365
11.
《IEEE transactions on image processing》2009,18(9):2012-2021
12.
《Quantum Electronics, IEEE Journal of》2008,44(12):1164-1170
13.
Acosta L. Jimenez M. Carvajal R.G. Lopez-Martin A.J. Ramirez-Angulo J. 《IEEE transactions on circuits and systems. I, Regular papers》2009,56(10):2145-2158
A comprehensive analysis of tunable transconductor topologies based on passive resistors is presented. Based on this analysis, a new CMOS transconductor is designed, which features high linearity, simplicity, and robustness against geometric and parametric mismatches. A novel tuning technique using just a MOS transistor in the triode region allows the adjustment of the transconductance in a wide range without affecting the voltage-to-current conversion core. Measurement results of the transconductor fabricated in a 0.5- mum CMOS technology confirm the high linearity predicted. As an application, a third-order Gm-C tunable low-pass filter fabricated in the same technology is presented. The measured third-order intermodulation distortion of the filter for a single 5-V supply and a 2-Vpp two-tone input signal centered at 10 MHz is -78 dB. 相似文献
14.
Jun-Hyun Park Sangwon Lee Kichan Jeon Sunil Kim Sangwook Kim Jaechul Park Ihun Song Chang Jung Kim Youngsoo Park Dong Myong Kim Dae Hwan Kim 《Electron Device Letters, IEEE》2009,30(10):1069-1071
The density of states (DOS)-based DC I-V model of an amorphous gallium-indium-zinc oxide (a-GIZO) thin-film transistor (TFT) is proposed and demonstrated with self-consistent methodologies for extracting parameters. By combining the optical charge-pumping technique and the nonlinear relation between the surface potential (phiS) and gate voltage (V GS), it is verified that the proposed DC model reproduces well both the measured V GS-dependent mobility and the I DS-V GS characteristics. Finally, the extracted DOS parameters are N TA = 4.4 times 1017 cm-3 middot eV-1, N DA = 3 times 1015 cm-3 middot eV-1, kT TA = 0.023 eV, kT DGA = 1.5 eV, and EO = 1.8 eV, with the formulas of exponential tail states and Gaussian deep states. 相似文献
15.
Zhaobing Tian Yang R.Q. Mishima T.D. Santos M.B. Johnson M.B. 《Photonics Technology Letters, IEEE》2009,21(21):1588-1590
Broad-area plasmon-waveguide interband cascade lasers with emission wavelengths near 7.5 mu m were demonstrated at temperatures up to 121 K in continuous-wave mode. Their threshold current densities and voltages varied from 72 A/cm2 and 2.1 V at 84 K to 400 A/cm2 and 2.7 V at 121 K, showing very efficient use of bias voltage (e.g., voltage efficiency of about 90% at 84 K) at this long wavelength. These plasmon-waveguide lasers also operated in pulsed mode at temperatures up to 165 K with emission wavelengths near 7.6 mum and threshold current density of 1100 A/cm2. 相似文献
16.
17.
《IEEE transactions on circuits and systems. I, Regular papers》2009,56(6):1134-1145
18.
《Microwave and Wireless Components Letters, IEEE》2008,18(11):749-751
19.
Jampana B.R. Melton A.G. Jamil M. Faleev N.N. Opila R.L. Ferguson I.T. Honsberg C.B. 《Electron Device Letters, IEEE》2010,31(1):32-34
The design of coherently strained InGaN epilayers for use in InGaN p-n junction solar cells is presented in this letter. The X-ray diffraction of the epitaxially grown device structure indicates two InGaN epilayers with indium compositions of 14.8% and 16.8%, which are confirmed by photoluminescence peaks observed at 2.72 and 2.67 eV, respectively. An open-circuit voltage of 1.73 V and a short-circuit current density of 0.91 mA/cm2 are observed under concentrated AM 0 illumination from the fabricated solar cell. The photovoltaic response from the InGaN p-n junction is confirmed by using an ultraviolet filter. The solar cell performance is shown to be related to the crystalline defects in the device structure. 相似文献
20.
《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》2010,18(2):194-200