A Low-Loss Image-Reject Mixer Using Source Follower Isolation Method for DRM/DAB Tuner Applications

Author

Wang, Keping ; Wang, Zhigong ; Lei, Xuemei ; Cao, Xiang ; Han, Peng ; Yang, Geliang ; Ma, Kaixue ; Yeo, Kiat Seng

Author_Institution

Inst. of RF- & OE-ICs, Southeast Univ., Nanjing, China

Volume

58

Issue

11

fYear

2011

Firstpage

729

Lastpage

733

Abstract

A novel low-loss image-reject mixer (IRM) using the source follower isolation method for digital radio mondiale/digital audio broadcasting applications is presented. It is based on double-quadrature mixers (DQMs) and passive polyphase filters (PPFs). The DQM is designed with four passive CMOS mixers. A source follower is inserted between the RF PPF and DQM to decrease the conversion loss of the IRM. Compared with the traditional isolation method, the source follower isolation method shows much higher on-resistance while looking into the RF port of the mixer; meanwhile, the chip area will be greatly decreased. This chip is fabricated in a 0.18-μm CMOS technology. The total conversion loss is 10.5 dB, and the conversion loss per stage of PPFs is 2.1 dB on average. The image-reject ratio is larger than 40 dB in the bandwidth of 1.536 MHz without trimming and calibration. The PldB gain compression point is 7.6 dBm. The chip core area is 1.1 × 1.3 mm².

Keywords

CMOS analogue integrated circuits; digital audio broadcasting; mixers (circuits); passive filters; CMOS technology; DAB; DQM; DRM; IRM; RF PPF; RF port; bandwidth; chip area; chip core area; conversion loss; digital audio broadcasting applications; digital radio mondiale; double-quadrature mixers; gain compression point; image-reject ratio; loss 10.5 dB; low-loss image-reject mixer; passive CMOS mixers; passive polyphase filters; size 0.18 mum; source follower isolation method; traditional isolation method; tuner applications; CMOS integrated circuits; Capacitors; Mixers; Radio frequency; Receivers; Tuners; Conversion loss; digital audio broadcasting (DAB); digital radio mondiale (DRM); double-quadrature mixers (DQMs); image-reject mixer (IRM); low loss; mixer; passive polyphase filters (PPFs);

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2011.2168014

Filename

6082414