Title :
Low-noise, low-distortion CMOS AM wide-band amplifiers matching a capacitive source
Author :
Chang, Zhongyuan ; Sansen, Willy M C
Author_Institution :
Dept. Elektrotech., Katholieke Univ. Leuven, Heverlee, Belgium
fDate :
6/1/1990 12:00:00 AM
Abstract :
A low-noise, low-distortion AM wideband CMOS amplifier that matches a capacitive antenna is presented. The amplifier uses a single-ended input stage to realize optimal noise matching with a capacitive source of 75 pF. The equivalent input noise voltage is as low as 0.7 μVrms within 2.5-kHz IF (intermediate frequency) bandwidth. A differential symmetrical class-AB output stage is optimized to large-scale signal distortion performance. With an 8-V single-power supply the amplifier is capable of driving a 7-Vpp/1-MHz signal into a 400-Ω load with a total harmonic distortion of 2%. A very high dynamic range of 130 dB has thus been achieved. An intermodulation-free dynamic range up to 96 dB and an IM3 intercept of 18 Vpp have been measured. The amplifier is fabricated in a standard 3-μm n-well CMOS technology. Design details concerning noise, distortion, and stability performance are analytically described
Keywords :
CMOS integrated circuits; amplitude modulation; antenna accessories; differential amplifiers; impedance matching; wideband amplifiers; 2.5 kHz; 3 micron; 75 pF; IF; IM3 intercept; capacitive antenna; capacitive source; differential symmetrical class-AB output stage; dynamic range; input noise voltage; intermodulation-free dynamic range; large-scale signal distortion performance; low-distortion CMOS AM wide-band amplifiers; n-well CMOS; optimal noise matching; single-ended input stage; stability; total harmonic distortion; Bandwidth; Broadband amplifiers; Broadband antennas; CMOS technology; Distortion; Dynamic range; Frequency; Large-scale systems; Low voltage; Low-noise amplifiers;
Journal_Title :
Solid-State Circuits, IEEE Journal of
