Hittite Microwave has introduced a compact 2,4 GHz transceiver for HomeRF and Bluetooth applications. The RFIC is designed to operate in conjunction with National Semiconductor's LMX3162 single chip baseband ASIC. Hittite's HMC310MS8G RFIC transceiver integrates a receiver LNA, a transmitter amplifier, Rx/Tx switch and control logic onto a single chip, which is then assembled into a low-cost plastic package.
This transceiver uses a novel single positive control line to toggle the transceiver state as well as activate the power down circuitry. The MMIC front-end requires no external components due to fully integrated features such as power down, RF matching and logic control. With full integration and a single control line, the total radio solution with both ICs occupies minimal board area. The HMC310MS8G transceiver I/O pins, logic, and voltage levels are set up for direct interface with National Semiconductor's LMX3162.
The device solves many timing issues of half-duplex systems by using a single logic line to operate the T/R switch while simultaneously shutting down the bias voltage in the corresponding amplifier. The removal of amplifier bias also assists in the overall isolation of each T/R switch path, resulting in a reduced switch size and complexity. Since there is never a time when both amplifiers are active, the layout of the LNA with the transmitter amplifier can be greatly compacted.
The HMC310MS8G allows the radio designer to create a compact low-cost two IC solution for a 2,4 GHz radio.
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