Digitally controlled oscillator design with a variable capacitance XOR gate

查看全文 作　　者：Manoj [1]Kumar;Sandeep [1]K.Arya;Sujata [2]Pandey

机构地区：[1]Department of Electronics and Communication Engineering,Guru Jambheshwar University of Science and Technology,Hisar,India;[2]Amity University,Noida,India

出　　处：《Journal of Semiconductors》索引2011年第32卷第10期,共7页

摘　　要：A digitally controlled oscillator(DCO) using a three-transistor XOR gate as the variable load has been presented.A delay cell using an inverter and a three-transistor XOR gate as the variable capacitance is also proposed. Three-,five- and seven-stage DCO circuits have been designed using the proposed delay cell.The output frequency is controlled digitally with bits applied to the delay cells.The three-bit DCO shows output frequency and power consumption variation in the range of 3.2486-4.0267 GHz and 0.6121-0.3901 mW,respectively,with a change in the control word 111-000.The five-bit DCO achieves frequency and power of 1.8553-2.3506 GHz and 1.0202-0.6501 mW,respectively,with a change in the control word 11111-00000.Moreover,the seven-bit DCO shows a frequency and power consumption variation of 1.3239-1.6817 GHz and 1.4282-0.9102 mW,respectively, with a varying control word 1111111-0000000.The power consumption and output frequency of the proposed circuits have been compared with earlier reported circuits and the present approaches show significant improvements. 关键词：电路设计可变电容数控振荡器数字控制振荡器输出频率控制字 DCO 晶体管

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Digitally controlled oscillator design with a variable capacitance XOR gate

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