Kevin Hsi-Huai Wang

Single-chip RF CMOS UMTS/EGSM transceiver with integrated receive diversity and GPS

The large commercial success of multiband multimode 3rd-generation cellular products has driven single-chip integration, SAW-filter reduction and low power consumption. State-of-the-art solutions require quad-band EGSM combined with multiband WCDMA/HSPA receiver diversity and integrated GPS. Compact form factors make single-chip SAW-less solutions highly desirable. A Quad-Band GSM/EDGE-only transceiver was published in [1], and Triple-Band WCDMA-only transceiver solutions were published in [2–4]. This work describes the first multiband WCDMA/HSPA/EGPRS single-chip transceiver with GPS and receiver diversity. This device supports UMTS Bands 1,2,3,4,5,6,8,9,10 and GSM/EDGE 800, 900, 1800, 1900MHz Bands. It is implemented in cost-effective 0.18µm RF CMOS technology and uses a reduced number of TX and RX SAW filters.

A Low-IF CMOS Simultaneous GPS Receiver Integrated in a Multimode Transceiver

This paper describes a GPS receiver circuit that operates simultaneously with WCDMA/CDMA2000 transceivers. This receiver uses a low-IF architecture to minimize the external passive components. The RF front-end circuit dynamically adjusts the linearity performance based on the instantaneous transmitting power of the integrated transmitter. The receiver measured performances are >80dB gain, 2.0dB noise figure, >20dB image rejection, maximum out-of-band IIP3 is +6dBm. The synthesize features -132dBc/Hz phase noise at 1MHz offset frequency and a total integrated double sideband phase noise of less than -30dBc in the 100Hz to 1MHz band. The receiver is fabricated in a 0.18 mum RFCMOS process, and draws 36.7mA at high linearity mode and 27.4mA at low linearity mode using switch mode power supply.

A CMOS Bluetooth radio transceiver using a sliding-IF architecture

A fully integrated Bluetooth radio transceiver has been implemented in a 0.25 /spl mu/m CMOS process. A sliding-IF architecture with two-step conversion approach is used for both the receiver and transmitter. The receiver exhibits superior image-rejection performance than the low-IF receiver with out-of-band images, and suffers less DC-offset problems than the zero-IF receiver with a two-step down-conversion. The transmitter is free from the LO pulling problem. The IC achieves a sensitivity of -83 dBm and an output power of 0 dBm, both measured at the antenna port.