Download Designing Bipolar Transistor Radio Frequency Integrated by Sweet A.A. PDF

By Sweet A.A.

This functional source deals engineers an in-depth and up to date figuring out of bipolar transistor RFIC layout. not like such a lot books out there that target GaAs MESFET or silicon CMOS method expertise, this specific quantity is devoted completely to RFIC designs in response to bipolar expertise. formerly, serious GaAs HBT and SiGe HBT strategy applied sciences were principally missed in reference books. This booklet fills this hole, supplying a close therapy of this more and more very important topic.Professionals find a wide variety of circuit topologies which are optimized for optimum functionality with bipolar units. From discussions of key functions (Bluetooth, UWB, GPS, WiMax) and architectures to in-depth assurance of fabrication applied sciences and amplifier layout to a glance at functionality trade-offs and construction bills, this publication palms engineers with entire layout knowledge for his or her tough paintings within the box.

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There are two other advantages to using the downconversion process associated with the superheterodyne receiver. First, it provides most of the receiver’s gain at the IF frequency, after frequency conversion, where amplifiers are small, cheap, and perform very well, as opposed to amplifiers at the RF frequency, which may be large and expensive and perform less well. The other advantage comes about in the detector and the audio amplifier, which follows the detector, where the information contained in the modulation is removed from the carrier signal and amplified before driving a speaker.

Before superheterodyne techniques became widespread, this detection was done directly at the RF frequency, and a great deal of audio gain was applied after the detector to build up the signal strength to drive the speaker. Prior to superheterodyne, the detector was operating at relatively low signals, requiring a great deal of audio gain to build signal strength. Such an architecture is highly vulnerable to 1/f noise in either the detector or the audio amplifiers. Superheterodyne techniques solve this problem by using a great deal of gain at the IF frequency to build the signal up so that when it reaches the detector, the signal-to-noise ratio is already very high, and 1/f noise effects do not impact the signal.

For instance, UWB can be used for the wireless transmission of movies between the hard drives of two computers over a reasonable time. UWB can also be used to transmit video in real time from a digital camcorder to a personal computer for storage. In effect, UWB has the potential to replace the highest-speed Ethernet cables. UWB fills the need for higher-data-rate wireless transmission than can be provided by WiFi g (above 50 Mbps). As originally conceived, UWB technology would make use of extremely short-duration impulses of RF energy.

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