Variable gain amplifiers (VGA) with temperature-independent linear-in-dB gain characteristics for wireless communication = 온도 비의존적인 linear-in-dB 이득특성을 가지는 무선통신용 가변이득증폭기(VGA)

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This thesis describes the design and implementation of variable gain amplifier (VGA) circuits for WCDMA, DSRC, and UWB applications. The focus is on the development of a design methodology for a VGA design in CMOS and BiCMOS technologies with temperature-independent linear-in-dB gain control characteristics. Research approach to design a VGA is different according to a process technology and its communication system. Therefore, we design each VGA cell suitable for its process technology and VGA requirements for WCDMA, DSRC, and UWB applications. Prior to VGA design, we propose a control signal conversion circuit, as it is called a voltage-to-current converter (VIC), including a temperature and supply-voltage compensation method for applying to three VGAs. At first, we describe a SiGe BiCMOS transmitter IC for WCDMA applications. It consists of an up-conversion mixer and a variable gain driver amplifier (RF VGA). To satisfy the VGA requirements with RF performance and VGA performance, we propose and demonstrate a current steering structure VGA. The mixer (UP-MIX), based on the MICROMIXER, utilized an IF transconductance stage with a cross-coupled type to improve the balancing property and linearity and uses a double balanced-type switching stage to isolate LO and IF signals at the output. The proposed Tx IC is achieved greater than 30 dB of a gain control range and has a highly linear characteristic with an output IP3 of 25 dBm, successfully operates in an accurate linear-in-dB up to the maximum gain and achieves a gain error less than ±1.2 dB over 25 ~ 80 ℃ and 2.7 ~ 3.3 V supply voltage using the temperature and supply voltage compensation techniques for gain variations. Next, we present a transmitter IC for 5.8-GHz DSRC applications. It consists of a baseband variable gain amplifier, an ASK modulator, and a LO signal source. To satisfy the VGA requirements with high linearity, we propose and demonstrate a triode transconductor with an exponential curren...
Hong, Song-Cheolresearcher홍성철researcher
한국과학기술원 : 전기및전자공학전공,
Issue Date
310386/325007  / 020025869

학위논문(박사) - 한국과학기술원 : 전기및전자공학전공, 2007.2, [ xi, 141 p. ]


Variable gain amplifier (VGA); CMOS; BiCMOS; linear-in-dB gain characteristic; MMIC; wireless communication; 가변이득증폭기; CMOS 기술; BiCMOS 기술; 지수함수적인 이득특성; 초고주파집적회로; 무선통신; Variable gain amplifier (VGA); CMOS; BiCMOS; linear-in-dB gain characteristic; MMIC; wireless communication; 가변이득증폭기; CMOS 기술; BiCMOS 기술; 지수함수적인 이득특성; 초고주파집적회로; 무선통신

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