UP-CONVERTER WITH AGC FUNCTION quadrature modULATOR IC FOR DIGITAL MOBILE COMMUNICATION SYSTEMS 上变频器与AGC功能正交调制器集成电路的数字移动通信系统 UP-CONVERTER WITH AGC FUNCTION quadrature modULATOR IC FOR DIGITAL MOBILE COMMUNICATION SYSTEMS SILICON MMIC UPCONVERTER WITH AGC IQ modULATOR