共查询到20条相似文献,搜索用时 0 毫秒
1.
设计了一种适于DVB-C标准的中频可变增益放大器。该放大器由三部分构成:电流调节型可变增益单元、基于差分对管传输特性的指数控制电压产生电路以及一高线性输出级。采用Chartered0.25μm RFCMOS工艺库下流片。测试结果表明,4~49dB的连续增益范围,100MHz的3dB带宽,50Ω负载下的OIP3为16.8dBm。 相似文献
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Seong-Sik Song Dong-Gu Im Hong-Teuk Kim Kwyro Lee 《Microwave and Wireless Components Letters, IEEE》2008,18(2):118-120
A differential wideband low-noise amplifier (LNA) based on the current amplification scheme is presented for digital TV tuners. In order to highly improve the linearity and exploit the noise cancellation, a common-gate stage with positive current feedback is integrated in parallel with a common-source stage using the current mirror amplifier. The proposed 0.18-mum CMOS LNA exhibits a power gain of 20.5 dB, an IIP3 of 2.7 dBm, an IIP2 of 43 dBm, and an average noise figure of 3.3 dB with 32.4 mW power consumption at a 1.8-V power supply and 0.12 mm2 area. 相似文献
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A Wideband CMOS Low Noise Amplifier Employing Noise and IM2 Distortion Cancellation for a Digital TV Tuner 总被引:1,自引:0,他引:1
《Solid-State Circuits, IEEE Journal of》2009,44(3):686-698
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采用片外谐振网络和多VCO的结构设计了一个宽带CMOS VCO,并采用一种新型的电荷泵式自动幅度控制电路,确保了VCO在整个带宽内的可靠性。基于Chartered 0.25μm CMOS工艺的测试结果表明,该VCO的频率能够覆盖75~900 MHz,单边带相位噪声最佳值达到了-92 dBc/Hz@10 kHz。 相似文献
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《Microwave Theory and Techniques》2009,57(11):2633-2642
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The emergence of wide channel bandwidth wireless standards requires the use of a highly linear, wideband integrated CMOS baseband chain with moderate power consumption. In this paper, we present the design of highly linear, wideband active RC filters and a digitally programmable variable gain amplifier. To achieve a high unity gain bandwidth product with moderate power consumption, the feed‐forward compensation technique is applied for the design of wideband active RC filters. Measured results from a 0.5 µm CMOS prototype baseband chain show a cutoff frequency of 10 MHz, a variable gain range of 33 dB, an in‐band IIP3 of 13 dBV, and an input referred noise of 114 µVrms while dissipating 20 mW from a 3 V supply. 相似文献
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《Microwave and Wireless Components Letters, IEEE》2008,18(9):617-619
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Wei-Hung Chen Gang Liu Zdravko B. Niknejad A.M. 《Solid-State Circuits, IEEE Journal of》2008,43(5):1164-1176
A broadband inductorless low-noise amplifier (LNA) design that utilizes simultaneous noise and distortion cancellation is presented. Concurrent cancellation of the intrinsic third-order distortion from individual stages is exhibited with the common-gate and common-source cascade. The LNA is then limited by the second-order interaction between the common source and common gate stages, which is common in all cascade amplifiers. Further removal of this third-order distortion is achieved by incorporating a second-order-distortion-free circuit technique in the common gate stage. Implemented in 0.13 m CMOS technology, this LNA achieved 16 dBm in both the 900 MHz and 2 GHz bands. Measurements demonstrate that the LNA has a minimum internal gain of 14.5 dB, noise figure of 2.6 dB from 800 MHz to 2.1GHz while drawing 11.6 mA from 1.5 V supply voltage. 相似文献
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给出了基于0.25μm CMOS工艺的数字电视调谐芯片中宽带低噪声LC VCO的设计,通过对VCO谐振网络的优化设计,显著抑制了flick噪声对相位噪声的影响,使三个波段的VCO的相位噪声有了明显改善,文中重点讨论了中波段VCO谐振网络的设计方法并给出中波段的相位噪声的仿真和测试结果。结果显示在中波段偏移中心频率10k处的相噪能改善5~10dBc,整个中波段相位噪声低于-85dBc/Hz@10kHz,频率覆盖190~530MHz。 相似文献
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设计了一种应用于DVB-S标准的数字电视调谐器的宽带放大器.采用电阻负反馈输入匹配结构,把交流反馈和直流偏置结合在一起,在噪声、增益和线性度方面达到了很好的性能,满足射频电视调谐器的应用需要.此低噪声放大器有约2.5 GHz的3 dB带宽,大于20 dB的电压增益,输入匹配优于-14 dB,噪声系数低于3.3 dB,IIP3在2.5 dBm之上.此LNA的输入匹配、线性度、噪声性能作了较为详细的讨论. 相似文献
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A Highly Linear SAW-Less CMOS Receiver Using a Mixer With Embedded Tx Filtering for CDMA 总被引:2,自引:0,他引:2
《Solid-State Circuits, IEEE Journal of》2009,44(8):2126-2137
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Ilku Nam Hyunwon Moon Jong-Dae Bae Byeong-Ha Park 《Microwave and Wireless Components Letters, IEEE》2007,17(10):739-741
In this paper, a wideband CMOS radio frequency (RF) front-end for various terrestrial mobile digital TV applications such as digital video broadcasting-handheld, terrestrial digital multimedia broadcasting, and integrated services digital broadcasting-terrestrial is proposed. To cover VHF III, UHF, and L bands and reduce the silicon area simultaneously, it employs three low-noise amplifiers and single-to-differential transconductors and shares the rest of the RF front-end. By applying ac-coupled current mirrored technique, the proposed RF front-end has good wideband performance, high linearity, and precise gain control. It is fabricated in 0.18 mum CMOS process and draws 15 mA~20 mA from a 1.8 V supply voltage for each band. It shows a gain of more than 29 dB, noise figure of lower than 2.5 dB, IIP2 of more than 30 dBm, IIP3 of more than -10 dBm for entire bands. 相似文献
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A 65 nm CMOS Multistandard, Multiband TV Tuner for Mobile and Multimedia Applications 总被引:2,自引:0,他引:2
Vassiliou I. Vavelidis K. Haralabidis N. Kyranas A. Kokolakis Y. Bouras S. Kamoulakos G. Kapnistis C. Kavadias S. Kanakaris N. Metaxakis E. Kokozidis C. Peyravi H. 《Solid-State Circuits, IEEE Journal of》2008,43(7):1522-1533
This paper presents a direct conversion, multistandard TV tuner implemented on a 65 nm digital CMOS process occupying less than 7 . The tuner is compliant with several digital terrestrial, fixed and mobile TV standards, including DVB-T, DVB-H, T-DMB, and ISDB-T. It achieves a 3/3.2/3.5 dB noise figure at VHF, UHF, and L-band, respectively, while the measured sensitivity at UHF for the QPSK-frac12 DVB-T mode is at the PCB connector. The implemented RF front-ends support both single-ended and differential inputs. An integrated - fractional-N synthesizer operating from 1.2 to 1.8 GHz achieves less than 1 integrated phase error, thus enabling a maximum SNR in excess of 37 dB for VHF and UHF. Multistandard capability is also enabled by programmable channel-select filters. Power consumption is less than 140 mW in DVB-T mode for all three bands. 相似文献
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Srinivasan V. Serrano G. J. Gray J. Hasler P. 《Solid-State Circuits, IEEE Journal of》2007,42(2):280-291
A long-term offset cancellation scheme that enables continuous-time amplifier operation is described. Offset cancellation is achieved by programming floating-gate transistors that form an integral part of the amplifier's architecture. The offset voltage of a single-stage folded cascode amplifier has been programmed to a minimum of plusmn25 muV in a 0.5 mum digital CMOS process. The long-term offset voltage drift has been calculated to be less than 0.5 muV over a period of 10 years at 55degC from a thermionic emission model for floating-gate charge loss. The offset voltage varies by a maximum of 130 muV over a temperature range of 170degC, thereby making this a viable approach to offset cancellation 相似文献
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Maxim A. Poorfard R. K. Johnson R. A. Crawley P. J. Kao J. T. Dong Z. Chennam M. Nutt T. Trager D. 《Solid-State Circuits, IEEE Journal of》2007,42(5):967-982
A low-IF fully integrated tuner for DBS satellite TV applications has been realized in 0.13-mum CMOS. A wideband ring oscillator-based frequency synthesizer having a large frequency step was used to downconvert a cluster of channels to a sliding low-IF frequency, while the second downconversion to baseband was performed in the digital domain. Eliminating the inductors and using a small-area oscillator has reduced both the parasitic magnetic and substrate coupling, allowing single-chip integration of the sensitive tuner and the noisy digital demodulator. A significant reduction in die area was achieved by using a single oscillator to cover the entire satellite TV spectrum, while a noise attenuator was cascaded with the PLL passive loop filter to reduce the equivalent VCO tuning gain. This improves PLL noise and spur performance and allows the on-chip integration of the loop filter. The digital low-IF tuner allows the use of a discrete step AGC loop that results in lower noise figure and higher linearity. Automatic signal path gain and bandwidth digital calibration was realized using replica ring oscillators. Tuner specifications include: 90 dB gain range, 10 dB noise figure at max gain, +25dBm IIP3 at min gain, 1.3deg rms integrated phase noise, <-50dBc spurs, 0.5-W power consumption from dual 1.8/3.3-V supplies, and 1.8times1.2 mm2 die area 相似文献
20.
Min Lin Haiyong Wang Yongming Li Hongyi Chen 《Analog Integrated Circuits and Signal Processing》2006,46(3):293-296
Low noise amplifier (LNA) in many wireless and wireline communication systems must have low noise, sufficient gain and high
linearity performance. This paper presents a novel IP3 boosting technique using Feedforward Distortion Cancellation (FDC)
method, that is, use an additional path to generate distortion and then cancel with the original LNA's distortion at its output.
Through this technique, the IIP3 of LNA can be boosted from about 0 dBm, which is reported in most public literature to date,
to +21 dBm, which is firstly reported to this day, with negligible noise degradation. 相似文献