An LO phase mismatch compensation technique for noise reduction in active mixers
Tóm tắt
A detection and compensation technique for LO phase mismatches is presented to reduce noise in the mixer. Based on theoretical analysis and simulation, this work shows that the LO phase mismatch degrades the noise figure, gain, and linearity of the mixer. To compensate the LO phase mismatch, a new concept of the mixer is proposed, and its prototype is fabricated in 0.18-μm CMOS technology. In addition, a current bleeding mixer, which is known for low flicker noise topology, is also fabricated for comparative purposes. From the measured results, the proposed mixer reduces the flicker noise corner frequency by almost half when it is compared to the current bleeding mixer. Moreover, the proposed mixer improves gain and linearity without additional power consumption.
Tài liệu tham khảo
Abidi, A. A. (1995). Direct conversion radio transceivers for digital communications. IEEE Journal of Solid-State Circuits, 30(12), 1399–1410.
Razavi, B. (1998). RF microelectronics. Upper Saddle River: Prentice Hall PTR.
Sacchi, E., Bietti, I., Erba, S., Tee, L., Vilmercati, P., & Castello, R. (September 2003). A 15mW, 70 kHz 1/f corner direct conversion CMOS receiver. In Proceedings IEEE Custom Integrated Circuits Conference (pp. 459–462).
Razavi, B. (1997). Design consideration for direct-conversion receiver. IEEE Transactions on Circuits and Systems II, 44(6), 428–435.
Zhang, Z. & Lau, K. (May 2001). Experimental study on MOSFET’s flicker noise under switching conditions and modeling in RF application. In IEEE Custom Integrated Circuits Conference (pp. 393–396).
Darabi, H., & Abidi, A. A. (2000). Noise in RF-CMOS mixers: A simple physical model. IEEE Journal of Solid-State Circuits, 35(1), 15–25.
Ham, D. & Hajimiri, A. (May 2000). Complete noise analysis for CMOS switching mixer via stochastic differential equations. In Proceedings IEEE Custom Integrated Circuits Conference (pp. 439–442).
Chehrazi, S., Bagheri, R., & Abidi, A. A. (November 2004). Noise in passive FET mixers: A simple physical model In Proceedings IEEE Custom Integrated Circuits Conference (pp. 375–378).
MacEachern, L. A. & Manku, T. (May 1998). A charge-injection method for Gilbert cell biasing In IEEE Canadian Electrical and Computer Engineering Conference (pp. 365–368).
Darabi, H., & Chiu, J. (2005). A noise cancellation technique in active RF-CMOS mixers. IEEE Journal of Solid-State Circuits, 40(12), 2628–2632.
Yoon, J., Kim, H., Park, C., Yang, J., Song, H., Lee, S., & Kim, B. (2008). A new RF CMOS Gilbert mixer with improved noise figure and linearity. IEEE Transactions on Microwave Theory and Techniques, 56(3), 626–631.
Park, J., Lee, C.-H., Kim, B.-S., & Laskar, J. (2006). Design and analysis of low flicker-noise CMOS mixers for direct-conversion receiver. IEEE Transactions on Microwave Theory and Techniques, 54(12), 4372–4380.
Lerdworatawee, J., & Namgoong, W. (2007). Generalized linear periodic time- varying analysis for noise reduction in an active mixer. IEEE Journal of Solid-State Circuits, 42(6), 1339–1351.
Lee, S. G., & Choi, J. K. (2000). Current-reuse bleeding mixer. Electronics Letters, 36(8), 696–697.
Meyer, R. G. (1986). Intermodulation in high-frequency bipolar transistor integrated-circuit mixers. IEEE Journal of Solid-State Circuits, 21(4), 534–537.
Terrovitis, M. T., & Meyer, R. G. (1999). Noise in current-commutating CMOS mixers. IEEE Journal of Solid-State Circuits, 34(6), 772–783.
Xu, J., Saavedra, C. E., & Chen, G. (2011). A 12 GHz-bandwidth CMOS mixer with variable conversion gain capability. IEEE Microwave and Wireless Components Letters, 21(10), 565–567.
Yu, W., & Leung, B. H. (1999). Noise analysis for sampling mixers using stochastic differential equations. IEEE Transactions on Circuits and Systems—II: Analog and Digital Signal Processing, 46(6), 699–704.