| 摘要 |
<p>A radio frequency (RF) power synthesis circuit which can be used for multi-frequency power signal control and synthesis is disclosed, and it uses impedance converters to reduce voltage across the switches. The circuit comprises: a control circuit; a first switch group (10) which is controlled by the control circuit and connected between transmission ports (TX1-TXN) and a multiplexer (16), thereby forming one or plural transmission frequency bands 1-N; a second switch group (14) which is controlled by the control circuit and connected between reception ports (RX11-RXNK) and the following impedance converter group (12), thereby forming one or plural reception frequency bands 1-N; and the impedance converter group (12) for reducing voltage across the switches in the first switch group (10) and the second switch group (14), which is connected between the second switch group (14) and the multiplexer (16). The circuit uses impedance converters (18) to isolate the large power signal from the switches, thereby effectively improves the capability of voltage breakdown resistance of the switch elements in the circuit and enables application of the CMOS device. The invention thus enables higher integration degree and lower cost of the RF power amplifier chip.</p> |
