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October 2010 [Devices & ICs] ICs Control Gain In Wireless Networks CAPACITY AND BANDWIDTH EFFICIENCY IN CURRENT AND EMERGING wireless communications formats such as Long Term Evolution (LTE) systems are driving the design of smaller base stations with multiple-carrier capabilities. The complex architectures in these systems, such as the use of multiple-input, multipleoutput (MIMO) antenna schemes, require even greater levels of integration in both base stations and handsets. Since many of these systems require variable gain control, which... February [Communications] RF Power Calibration Aids Wireless Transmitters Wireless transmitters can benefit from measurement and control of RF power. Because of such factors as regulatory requirements and the need to co-exist with other wireless networks, the RF power levels of wireless transmitter high-power amplifiers (HPAs) must be monitored and controlled. The precision and accuracy of these measurements can result in improved transmitter spectral performance as well as significant savings in operating cost for an... September 2004 [Components] High-Speed Logamps Precisely Detect Power Transmitters require circuitry to measure and control RF power for proper operation. Since system requirements vary widely, a power-control circuit may be as simple as a low-dynamic-range diode detector. The whole purpose for this device is to... October 2002 [Devices & ICs] Single Chip Realizes Direct-Conversion Rx Direct conversion of RF signals to baseband has long been a goal of communications systems designers. The approach can eliminate expensive and bulky hardware, but at the cost of some trade-offs in performance. What follows is an examination of the... February 2004 [Systems & Subsystems] Assessing Multicarrier Direct-Conversion Transmitters Direct-conversion transmitters appeal to designers of wireless systems for their simplicity and low cost. Unfortunately, the simple architecture does not allow the filtering of broadband noise, images and spurious components typically executed at... |
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