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A 5-GHz radio front-end with automatically Q-tuned notch filter and VCO

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2 Author(s)
Rogers, J.W.M. ; Dept. of Electron., Carleton Univ., Ottawa, Ont., Canada ; Plett, C.

A low-voltage receiver front-end for 5-GHz radio applications is presented. The receiver consists of a low-noise amplifier (LNA) with notch filter, a voltage-controlled oscillator (VCO), and a mixer. The LNA/notch filter has an automatic Q-tuning circuit integrated with it to provide good image rejection. On-chip transformers are used extensively in the receiver to improve performance and facilitate low-voltage operation. The receiver has a gain of 19.8 dB, noise figure of 4.5 dB, a third-order input intercept point (IIP3) of -11.5 dBm, and an image rejection of 59 dB, and the VCO had a phase noise of -116 dBc/Hz at 1-MHz offset.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 9 )