This paper proposes a new structure to lower the power consumption of a variable gain amplifier（VGA） and keep the linearity of the VGA unchanged.The structure is used in a high rate amplitude-shift keying（ASK） bas...This paper proposes a new structure to lower the power consumption of a variable gain amplifier（VGA） and keep the linearity of the VGA unchanged.The structure is used in a high rate amplitude-shift keying（ASK） based IF-stage.It includes an automatic gain control（AGC） loop and ASK demodulator.The AGC mainly consists of sixstage VGAs.The IF-stage is realized in 0.18μm CMOS technology.The measurement results show that the power consumption of the whole system is very low.The system consumes 730μA while operating at 1.8 V.The minimum ASK signal the system could detect is 0.7 mV（peak to peak amplitude）.展开更多
基金supported by the National High-Tech Research and Development Program of China(Nos.2008AA010703,2009AA011606)the National Natural Science Foundation of China(No.60976023)
文摘This paper proposes a new structure to lower the power consumption of a variable gain amplifier（VGA） and keep the linearity of the VGA unchanged.The structure is used in a high rate amplitude-shift keying（ASK） based IF-stage.It includes an automatic gain control（AGC） loop and ASK demodulator.The AGC mainly consists of sixstage VGAs.The IF-stage is realized in 0.18μm CMOS technology.The measurement results show that the power consumption of the whole system is very low.The system consumes 730μA while operating at 1.8 V.The minimum ASK signal the system could detect is 0.7 mV（peak to peak amplitude）.
