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- Title
CMOS low-power bandwidth-improved derivative superposition mixer using parasitic NPN BJTs.
- Authors
Keping Wang; Xuemei Lei
- Abstract
A low-power bandwidth-improved derivative superposition (DS) mixer in a standard 90 nm CMOS technology is analysed in depth. The negative gm" in saturated NMOS pseudo-differential transistor is compensated by the positive gm" in the parasitic NPN bipolar junction transistor. Compared with the traditional DS mixer using the dual- NMOS method, the proposed DS mixer shows a wider bandwidth owing to the lower parasitic capacitance at the base. The maximum conversion gain of the DS mixer is 7.2 dB with the 1 dB frequency bandwidth from 0.5 to 6 GHz. Compared with the Gilbert-type mixer, the third-order input interception point (IIP3) is improved by about 7.5 dB. The DS mixer consumes a DC power of 3.8 mW under 1 V supply.
- Subjects
COMPLEMENTARY metal oxide semiconductors; BANDWIDTHS; SUPERPOSITION (Optics); TRANSISTORS; ELECTRONIC systems; ELECTRONIC equipment; BIPOLAR transistors; DIRECT currents
- Publication
Electronics Letters (Wiley-Blackwell), 2013, Vol 49, Issue 25, p1605
- ISSN
0013-5194
- Publication type
Article
- DOI
10.1049/el.2013.2804