Low Power Transceivers

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CC1100 Low-Cost Low-Power Sub- 1 GHz RF Transceiver
The CC1100 is a low-cost sub- 1 GHz transceiver designed for very low-power wireless applications. The circuit is mainly intended for the ISM (Industrial, Scientific and Medical) and SRD (Short Range Device) frequency bands at 315, 433, 868, and 915 MHz, but can easily be programmed for operation at other frequencies in the 300-348 MHz, 400-464 MHz and 800-928 MHz bands.
http://www.ti.com/lit/gpn/cc1100
CC1101 Low-Cost Low-Power Sub-1GHz RF Transceiver
CC1101 is an improved and code compatible version of the CC1100 RF transceiver.
http://www.ti.com/lit/gpn/cc1101
LT5546 - 40MHz to 500MHz VGA and I/Q Demodulator with 17MHz Baseband Bandwidth
The LT®5546 is a 40MHz to 500MHz monolithic integrated quadrature demodulator with variable gain amplifier (VGA) and 17MHz I/Q baseband bandwidth designed for low voltage operation. It supports standards that use a linear modulation format. The chip consists of a VGA, quadrature downconverting mixers and 17MHz lowpass noise filters (LPF). The LO port consists of a divide-by-two stage and LO buffers.
http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1011,C1085,P2408,D1372
LT5500 - 1.8GHz to 2.7GHz Receiver Front End
The LT®5500 is a receiver front end IC designed for low voltage operation. The chip contains a low noise amplifier (LNA), a Mixer and an LO buffer. The IC is designed to operate over a power supply voltage range from 1.8V to 5.25V.
http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1011,C1085,P1729,D2437
LT5502 - 400MHz Quadrature IF Demodulator with RSSI
The LT™5502 is a 70MHz to 400MHz monolithic integrated quadrature IF demodulator. It consists 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 IF limiter has 84dB small-signal gain, and a built-in receive signal strength indicator (RSSI) with over 90dB linear range.
http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1011,C1085,P2065,D2402