An 11-band 3–10 GHz receiver in SiGe BiCMOS for multiband OFDM UWB communication

Electr. & Comput. Eng. Dept., Texas A&M Univ., College Station, TX
IEEE Journal of Solid-State Circuits (Impact Factor: 3.01). 05/2007; 42(4):935 - 948. DOI: 10.1109/JSSC.2007.892160
Source: IEEE Xplore


This work presents a receiver implementation for MB-OFDM UWB communication that enables 11 bands of operation covering 78% of the spectrum licensed by the FCC. First, important system-level considerations are discussed with basis on the specifications from the MB-OFDM standard. Next, the different circuit techniques employed in the implementation of the receiver are described. For the LNA design, a wideband impedance match network that takes into account the package components is introduced. A notch filter embedded in the LNA and its tuning mechanism are proposed to attenuate the interference from devices operating in the U-NII band from 5.15 to 5.35GHz. Based on the results of a recent investigation on frequency planning for MB-OFDM radios, a compact 11-band fast-hopping synthesizer implementation is proposed for the receiver. The 264-MHz baseband section consists of a linear phase low pass filter and a programmable gain amplifier; it presents an in-band group delay variation of less than 0.6 ns and 42 dB of gain in steps of 2 dB. The IC is fabricated in a 0.25-mum SiGe BiCMOS process, placed in a QFN package and mounted on FR-4 substrate for its characterization. Measurement results show a receiver gain of 78-67 dB and NF of 5-10 dB across the 11 bands from 3-10 GHz, while consuming 114 mA from a 2.5-V supply

Download full-text


Available from: José Silva-Martínez, Mar 22, 2013
  • Source
    • "The measured time domain waveform and electrical spectrum of LDPC code MB-OFDM UWB signal is shown in Fig. 4. In the ECMA 368 standard, the first band group has three bands. In fact, current efforts from semiconductor companies for the implementation of integrated UWB devices focus on the first band group of three bands [18]. From Fig. 4(a), it can be seen that the waveform of Band #1, Band #2 and Band #3 is responding to the first band group in the ECMA 368 standard, respectively. "
    [Show abstract] [Hide abstract]
    ABSTRACT: To improve the transmission performance of multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) over optical fiber, a pre-coding scheme based on low-density parity-check (LDPC) is adopted and experimentally demonstrated in the intensity-modulation and direct-detection MB-OFDM UWB over fiber system. Meanwhile, a symbol synchronization and pilot-aided channel estimation scheme is implemented on the receiver of the MB-OFDM UWB over fiber system. The experimental results show that the LDPC pre-coding scheme can work effectively in the MB-OFDM UWB over fiber system. After 70 km standard single-mode fiber (SSMF) transmission, at the bit error rate of 1 x 10(-3), the receiver sensitivities are improved about 4 dB when the LDPC code rate is 75%.
    Full-text · Article · Oct 2014 · Optical Fiber Technology
  • Source
    • "Moreover, it also needs a wideband passive network to provide the single-ended-to-differential conversion between the antenna and LNA. To this aim, both off-chip baluns and integrated transformers are not viable solutions since the former exhibit high-frequency limitations and the latter introduce losses that directly add to the NF of the LNA, heavily degrading the performance of the whole receiver [5]. Moreover, off-chip baluns and integrated transformers increase complexity and silicon area, respectively. "
    [Show abstract] [Hide abstract]
    ABSTRACT: A 90-nm CMOS low-noise amplifier (LNA) for 3-10-GHz ultra-wideband (UWB) applications is presented. The circuit adopts a single-ended dual-stage solution. The first stage is based on a current-reuse topology and performs UWB (3-10 GHz) input matching. The second stage is a cascode amplifier with resonant load to enhance gain and reverse isolation. Thanks to both the circuit solution and design approach, the LNA provides input matching, low noise, flat gain, and small group-delay variation in the UWB frequency range at minimum power consumption. The design is also conceived to cope with application issues such as low-cost off-chip interfaces and electrostatic discharge robustness. Measurements exhibit a 12.5-dB power gain in a 7.6-GHz 3-dB bandwidth, a minimum noise figure of 3 dB, a reverse isolation better than 45 dB up to 10.6 GHz, and a record small group-delay variation of ±12 ps. The LNA draws 6 mA from a 1.2-V power supply.
    Preview · Article · Apr 2011 · IEEE Transactions on Microwave Theory and Techniques
  • Source
    • "High linearity feature is also demanded, hence, out of band interferences do not create inter-modulations which fall in the pass-band. From the system performance analysis , the allowed in-band ripple is 1 dB and the required group delay is 6 ns, which is based on the ADC performance design[3]. The order of the filter is determined based on the type of filter, cutoff frequency and signal rejection ratio requirement . "
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents a high linearity wideband sharp roll-off Opamp-RC low-pass filter (LPF) for Ultra wideband (UWB) applications. The proposed LPF is composed of three biquads’ transfer functions with different Q-factors in series. Sharp roll-off is attributed to the steep slope of the peaking of a biquad transfer function with a high Q-factor. The superposition of these biquads also helps extend the bandwidth of the overall LPF transfer function without the cost of extra power dissipation. The effects of biquad arrangements on noise and linearity performances are investigated. A simple operational amplifier (op-amp) is adopted to ensure high frequency characteristics and high linearity performance for the designed filter. The LPF is implemented in 0.13-μm IBM CMOS process from 1.5 V supply. The measured cutoff frequency is 264 MHz with the pass-band ripple of less than 1 dB. Digital frequency tuning is implemented with 40% of tuning range around the cutoff frequency. The amount of out-of-band rejection at 290 MHz and at twice cutoff frequency is 12 dB and about 50 dB, respectively. Good linearity with IIP3 of 23 dBm is obtained. The 6th-order LPF dissipates only 12 mW with the active chip size of 400 × 640 μm2.
    Full-text · Article · Oct 2009 · Analog Integrated Circuits and Signal Processing
Show more