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An Active IF Balun for a Doubly Balanced Resistive Mixer
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- Authors
- Jin Cheol Jeong, In Bok Yom, Kyung Whan Yeom
- Issue Date
- 2009-04
- Citation
- IEEE Microwave and Wireless Components Letters, v.19, no.4, pp.224-226
- ISSN
- 1531-1309
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- In this letter, we present a wideband active intermediate frequency (IF) balun for a doubly balanced resistive mixer implemented using a 0.5 μm GaAs pHEMT process. The 0.3 ×0.5 mm2 IF balun was realized through a dc-coupled differential amplifier in order to extend IF frequency of the mixer to dc. The measured amplitude and phase imbalances were less than 1 dB and 5째, respectively, from dc to 7 GHz. The output third order intercept (OIP3) and P1 dB of the IF balun were 18 dBm and 6 dBm, respectively at 1 GHz. The mixer with the IF balun is 1.7 × 1.8 mm2 in size, has a conversion loss of 2 to 8 dB from 8 to 20 GHz RF frequency at a fixed IF of 1 kHz, which proves the mixer operates successfully at an IF frequency close to dc. The measured OIP3 were +10 to +15 dBm over the operating frequency with a dc power consumption of 370 mW. © 2009 IEEE.
- KSP Keywords
- Active intermediate, Conversion loss, DC-coupled, Dc power, GaAs pHemt, Intermediate frequency, Operating frequency, Power Consumption, RF frequency, Third-order, differential amplifier