Toshiba Develops a New Receiver IC for Digital Mobile Communications Systems|
14 February, 1995
TOKYO -- Toshiba Corporation today announced the development of a new receiver IC for digital mobile communications systems. The new IC has been developed to assure smaller, more cost-attractive receivers for personal handy phone systems (PHS), a new generation of digital mobile communications systems now under development in Japan.
The new receiver IC reduces the area taken up by the circuitry of PHS phones, its high level of integration cutting the number of circuit elements to almost half that found in current state-of-the-art handy phones. This is achieved by utilization of silicon BiCMOS processing of a direct conversion receiver (DCR) chip. The DCR chip requires less external circuitry and has lower manufacturing costs than the GaAs super heterodine chip used in PHS receivers now under developemnt. The new IC integrates such circuits as a low noise amplifier, frequency converter, channel selection filter circuit and a variable gain amplifier on a single chip.
Digital mobile telephone systems are enjoying rapid growth, and this is promoting interest in developing more affordable systems. In Japan, the new PHS digital mobile telephone systems, which use the 1.9GHz frequency band, are now completing system development. Commercial services are expected to start this July. PHS transceivers must be small, a requirement promoting demand for small semiconductor-based components. Toshiba's new receiver IC provides a solution with technologies that can be applied to diverse mobile information and communications equipment.
The new technologies for the receiver IC will be announced on Thursday 16th, February, at the International Solid State Circuits Conference '95, in San Francisco.
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