This paper presents an LC VCO with auto-amplitude control （AAC）, in which pMOS FETs are used,and the varactors are directly connected to ground to widen the linear range of Kvco. The AAC circuitry adds little noise ...This paper presents an LC VCO with auto-amplitude control （AAC）, in which pMOS FETs are used,and the varactors are directly connected to ground to widen the linear range of Kvco. The AAC circuitry adds little noise to the VCO but provides it with robust performance over a wide temperature and carrier frequency range.The VCO is fabricated in a chartered 50GHz 0.35μm SiGe BiCMOS process. The measurements show that it has - 127. 27dBc/Hz phase noise at 1MHz offset and a linear gain of 32.4MHz/V between 990MHz and 1.14GHz.The whole circuit draws 6. 6mA current from 5V supply.展开更多
A DC-offset cancellation scheme in a 5GHz direct-conversion receiver compliant with the IEEE 802.11a wireless LAN standard is presented. An analog feedback loop is used to eliminate the DC-offset at the output of the....A DC-offset cancellation scheme in a 5GHz direct-conversion receiver compliant with the IEEE 802.11a wireless LAN standard is presented. An analog feedback loop is used to eliminate the DC-offset at the output of the. double-balanced mixer. The test results show that the mixer with the DC-offset cancellation circuit has a voltage conversion gain of 9.5dB at 5.15GHz, a noise figure of 13.5dB, an IIP3 of 7.6dBm, a DC-offset voltage of 1.73mV eliminating 76% of DC-offset,and a power consumption of 67mW with a 3.3V supply. The direct conversion WLAN receiver has been implemented in 0.35μm SiGe BiCMOS technology.展开更多
A wide tuning range,low power CMOS automatic gain control（AGC） with a simple architecture is proposed. The proposed AGC is composed of a variable gain amplifier（VGA）,a comparator and a charge pump,and the dB-linea...A wide tuning range,low power CMOS automatic gain control（AGC） with a simple architecture is proposed. The proposed AGC is composed of a variable gain amplifier（VGA）,a comparator and a charge pump,and the dB-linear gain is controlled by the charge pump.The AGC was implemented in a 0.18μm CMOS technology.The dynamic range of the VGA is more than 55 dB,the bandwidth is 30 MHz,and the gain error is lower than±1.5 dB over the full temperature and gain ranges.It is designed for GPS application and is fed from a single 1.8 V power supply. The AGC power consumption is less than 5 mW,and the area of the AGC is 700×450μm^2.展开更多
文摘This paper presents an LC VCO with auto-amplitude control （AAC）, in which pMOS FETs are used,and the varactors are directly connected to ground to widen the linear range of Kvco. The AAC circuitry adds little noise to the VCO but provides it with robust performance over a wide temperature and carrier frequency range.The VCO is fabricated in a chartered 50GHz 0.35μm SiGe BiCMOS process. The measurements show that it has - 127. 27dBc/Hz phase noise at 1MHz offset and a linear gain of 32.4MHz/V between 990MHz and 1.14GHz.The whole circuit draws 6. 6mA current from 5V supply.
文摘A DC-offset cancellation scheme in a 5GHz direct-conversion receiver compliant with the IEEE 802.11a wireless LAN standard is presented. An analog feedback loop is used to eliminate the DC-offset at the output of the. double-balanced mixer. The test results show that the mixer with the DC-offset cancellation circuit has a voltage conversion gain of 9.5dB at 5.15GHz, a noise figure of 13.5dB, an IIP3 of 7.6dBm, a DC-offset voltage of 1.73mV eliminating 76% of DC-offset,and a power consumption of 67mW with a 3.3V supply. The direct conversion WLAN receiver has been implemented in 0.35μm SiGe BiCMOS technology.
文摘A wide tuning range,low power CMOS automatic gain control（AGC） with a simple architecture is proposed. The proposed AGC is composed of a variable gain amplifier（VGA）,a comparator and a charge pump,and the dB-linear gain is controlled by the charge pump.The AGC was implemented in a 0.18μm CMOS technology.The dynamic range of the VGA is more than 55 dB,the bandwidth is 30 MHz,and the gain error is lower than±1.5 dB over the full temperature and gain ranges.It is designed for GPS application and is fed from a single 1.8 V power supply. The AGC power consumption is less than 5 mW,and the area of the AGC is 700×450μm^2.
