Wireless |
Wireless communications today covers a very wide array of applications via radio frequency, microwave, and infrared. A Wi-Fi enabled device, such as a cell phone and PDA, can connect to the Internet within the range of a wireless network connected to the Internet. Some cities have gone completely wireless by installing Wi-Fi city-wide. As opposed to wireline communications, wireless communications can provide additional freedom and save installation, but less reliability and security.
Linear Technology - LT®5502
 The LT®5502 is a 400MHz quadrature IF demodulator consisting of an IF limiter, quadrature down mixers, integrated lowpass filters, and divide-by-two LO buffers. The demodulator provides all building blocks for demodulation of I and Q baseband signals with a single supply voltage of 1.8V to 5.25V. The integrated lowpass output filters act as antialiasing and pulse-shaping filters for demodulated I/Q-baseband signals.
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Analog Devices - ADF411x Frequency Synthesizers
 The ADF411x family of frequency synthesizers can be used to implement local oscillators (LO) in the upconversion and downconversion sections of wireless receivers and transmitters. They consist of a low noise digital phase frequency detector (PFD), a precision charge pump, a programmable reference divider, programmable A and B counters, and a dual-modulus prescaler (P/P + 1). The A (5-bit) and B (13-bit) counters, in conjunction with the dual-modulus prescaler (P/P + 1), implement an N divider (N = BP + A).
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