Various wireless applications are currently under development for the unlicensed 60 GHz band. This paper describes three examples with different system requirements. The first two are point-to-multipoint wireless networks (in an airplane and in a car) and the third one is a short range point-to-point connection. Special requirements of the applications are a high number of users for the point-to-multipoint connection and a high data rate of 10 Gbit/s for the point-to-point connection system. Implementation aspects are pointed out, which are important to demonstrate the functionality of the system in a relevant environment and are key aspects to develop the related products. For example, integration aspects of the antenna into an airplane passenger seat and the receiver concept of the radio frequency-(RF) front-end to reducing the power consumption at ultrahigh data rates are described. Additionally, to determine the geometrical system architecture, ray-tracing simulations inside an aircraft and inside a car were performed.
A 17-tap 3.5 Gbps finite impulse response (FIR) pulse shaping filter for 60 GHz transmitters with quadrature phaseshift keying (QPSK) modulation is presented. Measurement results show that an attenuation of 19 dB at 2.2 GHz is achieved with cutoff frequency of 1.76 GHz,which enable the 60 GHz transmitter to comply with the stringent spectrum mask requirement. No digital-to-analog converters (DACs) are needed in the proposed approach performed in the analog baseband. The dc power of 3.3 V × 300 mA (55 mA without buffers) is competitive compared to conventional DACs not providing filtering functionality. Implemented in a 0.25 μm SiGe HBT technology, the fully integrated circuit consumes an area of 1.6mm 2 .
This paper presents the design and characterization of a vector quadrature modulator integrated circuit, fabricated in a 0.25 µm SiGe BiCMOS technology for use in a QPSK wireless transmission system at 60 GHz. The approach chosen for narrowband quadrature generation allows the integration on a 0.98 mm×0.88 mm area, significantly smaller than other reported mm-wave quadrature modulator ICs. The circuit consists of two active double-balanced mixers and a network of transmission lines, whose impedances and lengths are designed to provide simultaneously quadrature differential signals and power matching to 50 Ω for the high-frequency ports of the mixers. On-wafer characterization of the modulator showed an amplitude error of only 0.3 dB and a phase error of 20 • , suitable for singlecarrier QPSK communications. For optimal operation, the circuit requires -3 dBm of carrier power and 16 mA of bias current from a 3 V supply.
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