mixer translates multiple standards


Posted on Feb 6, 2014

This broadband frequency-upconversion mixer, which has been simulated with and without a novel linearity-enhancement circuit, is suitable for multiple-standard wireless applications from 1. 0 to 10. 6 GHz. Wireless communications products continue to support multiple communications standards, pushing designers to develop components that can work acr


mixer translates multiple standards
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oss as many bands and standards as possible. Ideally, a single device would handle all wireless communications standards and bands. But before that day comes, it is necessary to develop components ”such as upconversion mixers ”that can operate with several wireless standards. By employing a cross-coupling post-distortion technique (CCPFT), it was possible to design an upconversion mixer with outstanding linearity for multiple wireless communications standards. The mixer was simulated with commercial software, based on fabrication with a CHRT 0. 18- m silicon CMOS mixed-signal/RF semiconductor process. As will be shown, the mixer consumes only 5 mW power from a +1. 2-VDC supply. It achieves a maximum input third-order intercept point (IIP3) of +16. 56 dBm with 3. 5 dB conversion gain (flat to within ±0. 5 dB), with 10. 7-dB noise figure (flat to within ±0. 5 dB) across a frequency range of 1. 0 to 10. 6 GHz. This makes it ideally suited for software-defined radios (SDRs), as well as multiple-band ultrawideband (UWB) communications systems. 1 An upconversion mixer should provide low noise figure with reasonable gain and high linearity while consuming low power to be effective in modern multiple-standard wireless transmitters. Such mixers have been developed, including the 3. 0-to-5. 1-GHz upconversion mixer of ref. 2 designed with a current-reuse technique to minimize power consumption. It delivers 3. 8-dB gain and 8. 4-dB...




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