A complete UMTS transmitter using BAW filters and duplexer: A 90-nm CMOS digital RF signal generator and a 0.25-μm BiCMOS power amplifier

Abstract

A complete UMTS transmitter is proposed. It is composed of a radiofrequency (RF) signal generator, a power stage, and a bulk acoustic wave (BAW) duplexer. The 90-nm CMOS digital RF signal generator is based on a third-order delta-sigma modulator using innovative design techniques to increase work frequency and a BAW filter to get rid of out-of-band quantization noise. The filter exhibits very high rejection, 3 dB of insertion losses at 1.95 GHz for a 3% fractional bandwidth. The 0.25-lm BiCMOS power stage feeds a BAW duplexer that allows to share a common between W-CDMA emission and reception. This 4 Â 4 mm 2 duplexer, built with flip-chipped BAW on glass substrate, ensures good isolation. The full transmitter measurements show the compliance with respect to spurious emissions in the different frequency bands and an EVM measurement at the state of the art (<5%).

Digital radio frequency signal generation towards ultimate transmitters

“…frequency division duplex (FDD) standards, such as 3G UMTS. In an experiment with delta-sigma generated RF signals filtered by BAW filters and duplexers in a complete transmitter [20], we measured the wideband spectral emissions to ensure compatibility of this transmitter with existing wireless standards. Spurious emission specifications for 3G systems are indicated in Fig.…”

Analysis and optimization of acoustic wave micro-resonators integrating piezoelectric zinc oxide layers

“…Acoustic filters are among the most compact devices that can be used for RF communication systems [1][2][3], and recent improvements of composite MEMS resonators enable to achieve very high quality factors Q, allowing for low-imprint devices and operating frequencies as high as 8 GHz [4] [5]. A lot of research efforts were focused on bulk acoustic wave (BAWs) [6][7][8] devices which offered many potentialities for smart RF components or systems, especially as an alternative to surface acoustic waves (SAWs) filters [9] [10].…”

A zinc dioxide-on-silicon MEMS resonator for narrowband filtering

“…It is in this context that SAW (Surface Acoustic Wave), BAW (Bulk Acoustic Wave) and MEMS (Micro Electro Mechanical Systems) acoustic micro-resonators have been developed to fabricate efficient filters with very small dimensions. BAW devices based, for instance, on aluminum nitride (AlN) [1], zinc dioxide (ZnO) [2] or lithium niobate (LiNbO 3 ) [3] have been extensively studied and this technology has emerged as a very promising and competitive alternative due to its small form factor, high operating frequency up to GHz, and especially its compatibility with Integrated Circuit (IC) [4] technology.…”