BICMOS CIRCUITS FOR RADIOFREQUENCY AND BA SEBAND SIGNAL-PROCESSING

The combination of bipolar and MOS-transistors offers a large potentia l to develop complex circuits on a single chip. The large transconduct ance and the high transit frequency of the bipolar transistor allows t he realization of precision analog baseband circuits and of RF-circuit s capable to operate at frequencies up to several GHz. In contrast the transconductance of the MOS-transistor is lower but it has an insulat ing gate and yields an excellent bidirectional switch. The BiCMOS-tech nology combines the benefits of both technologies. This contribution s hows some applications of analog BiCMOS circuits which cannot be easil y duplicated in other technologies.