Title :
A Passive Mixer for a Wideband TV Tuner
Author :
Le, Viet-Hoang ; Nguyen, Hoai-Nam ; Lee, In-Young ; Han, Seok-Kyun ; Lee, Sang-Gug
Author_Institution :
μ-Radio Lab., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
fDate :
7/1/2011 12:00:00 AM
Abstract :
This brief presents the design of a direct conversion mixer for a wideband television tuner operating at 48-860 MHz. The mixer consists of a transconductance stage, a passive current switching stage, and a transimpedance amplifier stage. In the switching stage, by adopting an opposite phase auxiliary switching quad configured in parallel with the main switching quad, the unwanted harmonics at the output of the switching stage are suppressed, thereby preventing mixer linearity degradation at low input frequencies. The proposed mixer is implemented in a 0.13-μm CMOS technology, and measurements show more than a 19.5-dB voltage gain, 12-dB noise figure, and 8-dBm IIP3 over the entire operating band of 48-860 MHz while dissipating 4.5 mA from a 1.2-V supply.
Keywords :
CMOS integrated circuits; broadband networks; mixers (circuits); television receivers; tuning; CMOS technology; current 4.5 mA; direct conversion mixer; frequency 48 MHz to 860 MHz; gain 19.5 dB; low input frequencies; mixer linearity degradation; noise figure 12 dB; passive current switching stage; passive mixer; phase auxiliary switching quad; size 0.13 mum; transconductance stage; transimpedance amplifier stage; voltage 1.2 V; wideband TV tuner; Impedance; Mixers; Noise measurement; Radio frequency; Switches; TV; Tuners; CMOS mixer; current switching mixer; harmonic suppression; high linearity; passive mixer; television (TV) tuner; wideband mixer;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2011.2158262
