A 0.7-3 GHZ GAAS QPSK QAM DIRECT MODULATOR

被引:27
作者
BOVEDA, A [1 ]
ORTIGOSO, F [1 ]
ALONSO, JI [1 ]
机构
[1] UNIV POLITECN MADRID,ESCUELA TECN SUPER INGN TELECOMUN,MADRID,SPAIN
关键词
Heterodyning - Microprocessor chips - Microwave devices - Solid state devices;
D O I
10.1109/4.262008
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A single chip I/Q direct modulator for use in digital radio links is presented. This device translates directly the phase and quadrature baseband signals to a microwave frequency that can be chosen between 700 MHz and 3 GHz avoiding the use of IF circuits. It is able to generate any type of digital modulation as QPSK, n-PSK, n-QAM, GMSK, etc., with band-limited spectrum. The bandwidth of the I/Q modulating signals is more than 500 MHz allowing the use of the circuit even in the highest capacity systems. The device has 120 components in a 2.2 x 2.4 mm chip and has been fabricated using 0.5 mum GaAs MESFET process.
引用
收藏
页码:1340 / 1349
页数:10
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