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A Low-Power WCDMA Transmitter With an Integrated Notch Filter

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2 Author(s)
Mirzaei, A. ; Broadcom Corp., Irvine, CA, USA ; Darabi, H.

A filtering technique to attenuate the receive-band noise enables a 65-nm CMOS WCDMA transmitter to achieve an output noise level of -160 dBc/Hz at 80-MHz offset, while dissipating 65 mW. Using a feedback filtering technique, the circuit introduces a null with an arbitrary width at the receive frequency and eliminates the need for an external SAW filter. A stability analysis is performed to choose the most suitable architecture for the feedback path, which ensures stability over a wide range of loop-gain. Nonideal effects such as quadrature phase and gain errors, LO feedthrough, harmonic downconversion and phase-noise are also analyzed.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:43 ,  Issue: 12 )