English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

GHz dual-band Weaver-Hartley dual-conversion downconverters are demonstrated using 0.35-"m SiGe heterojunction bipolar transistor (HBT) technology with/without a correlated local oscillator (LO) generator. In the flrst implementation, the correlated LO generator consists of a divide-by-two frequency divider, a frequency doubler and a single-sideband upconverter and thus LO1 (= 2:5£LO2) signal is generated. As a result, the downconverter with the correlated LO signals has image-rejection ratios of more than 39dB for the flrst/second image signals (IRR1/IRR2) of the dual-conversion system at both 2.4/5.7-GHz modes while the downconverter without the correlated LO generators has a 6-dB higher conversion gain and IRR1/IRR2 of more than 44dB with the same dc power consumption (excluding the LO generator). On the other hand, a 10-GHz Weaver- Hartley downconverter is demonstrated with a resonant LC load at the flrst-stage mixer to improve the conversion gain at high frequencies. The downconverter achieves a conversion gain of 8dB with IRR1/IRR2 better than 43/40dB.

SIGE HBT DUAL-CONVERSION WEAVER-HARTLEY DOWNCONVERTERS WITH HIGH IMAGE REJECTION