A low-noise mixer with an image-reject notch filter for 2.4 GHz applications
✍ Scribed by Nam-Jin Oh
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 688 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0026-2692
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✦ Synopsis
This paper presents a low noise first down-conversion mixer with a notch filter for the heterodyne receiver. The notch filter connected to the output node of the mixer driver stage plays a role of image rejection at an image frequency, thereby suppressing the sideband image noise and improving the mixer noise performance. Targeted for 2.4 GHz industrial-scientific-medical band applications, a simple source-degenerated down-conversion single balanced mixer with the filter is implemented. The measurement results of the proposed down-conversion mixer shows about 3.0 dB improvement of single-side band noise figure, about 2.9 dB power conversion gain improvement, and 25 dB image suppression compared to those without the filter dissipating 4 mA from a 2.5 V supply voltage.