A Wideband CMOS Low Noise Amplifier Employing Noise and IM2 Distortion Cancellation for a Digital TV Tuner

• Published in: IEEE journal of solid-state circuits Vol. 44; no. 3; pp. 686 - 698
• Main Authors: IM, Donggu, NAM, Ilku, KIM, Hong-Teuk, LEE, Kwyro
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.03.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Amplifiers; Analog circuits; Applied sciences; Broadband amplifiers; Cable; Cable TV; Cancellation; Circuit properties; CMOS; complementary device; current mirror; Design. Technologies. Operation analysis. Testing; Digital; Digital broadcasting; digital terrestrial; Digital TV; Distortion; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; IIP2; IM2 distortion canceling; Integrated circuits; low noise amplifier; Low-noise amplifiers; MOS devices; Noise; noise canceling; Noise cancellation; Noise figure; Noise levels; Radio frequency; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Television; Transformers; tuner; Tuners; Wide band noise; Analog circuit; Gate current; Performance evaluation; Electric transformer; Cable; Noise figure; Second order; Noise reduction; Power gain; Low noise amplifier; digital terrestrial; Tuner; current mirror; CMOS; Current mirrors; Wide band; Complementary MOS technology; IIP2; Low noise circuit; Third order; PMOS technology; Common source configuration; Cable television; noise canceling; Power consumption; Intercept point; complementary device; Thermal noise; NMOS technology; IM2 distortion canceling
• ISSN: 0018-9200; 1558-173X
• DOI: 10.1109/JSSC.2008.2010804

A wideband CMOS low noise amplifier (LNA) with single-ended input and output employing noise and IM2 distortion cancellation for a digital terrestrial and cable TV tuner is presented. By adopting a noise canceling structure combining a common source amplifier and a common gate amplifier by current amplification, the LNA obtains a low noise figure and high IIP3. IIP2 as well as IIP3 of the LNA is important in broadband systems, especially digital terrestrial and cable TV applications. Accordingly, in order to overcome the poor IIP2 performance of conventional LNAs with single-ended input and output and avoid the use of external and bulky passive transformers along with high sensitivity, an IM2 distortion cancellation technique exploiting the complementary RF performance of NMOS and PMOS while retaining thermal noise canceling is adopted in the LNA. The proposed LNA is implemented in a 0.18 mum CMOS process and achieves a power gain of 14 dB, an average noise figure of 3 dB, an IIP3 of 3 dBm, an IIP2 of 44 dBm at maximum gain, and S11 of under -9 dB in a frequency range from 50 MHz to 880 MHz. The power consumption is 34.8 mW at 2.2 V and the chip area is 0.16 mm 2 .