The Design And Implementation Of High Performance Mixer And Buffer

With the development of communication technology, wireless technology is widely used in GPS (Global Position System), Satellite phone, WLAN (Wireless Local Area Network), RFID (Radio Frequency Identification Devices), Beidou Navigation Seystem and Radar, and so on. As the demand of miniaturization, low power consumption and high performance of wireless terminal becoming higher, the research on high performance transceiver chip has come to be extremely important.The frequency exchange is essential in the radio commutation system. The receiver part needs to translate the Radio Frequency (RF) signal to the Intermediate Frequency (IF) signal to realize signal processing and signal extraction. The transmitter part needs to translate the IF signal to RF signal to realize signal transmission. The mixer is the module to realize frequency conversion. The mixer plays an important role in the wireless transceivers. Another important reason of mixer design is that the mixer’s linearity decides the dynamic range of the transceiver and the mixer’s noise figure decides the sensitivity of the whole system. Besides, the mixer’s conversion gain decides the conversion gain of the whole transceiver.The design and implementation of the high performance radio mixer and LO-Buffer are the main works of this article. The mixer’s design philosophy is high linearity and low noise figure. At first, this article presents the design and analysis of the active mixer and passive mixer and their LO-Buffer. In the active mixer design, this article uses the traditional Gilbert mixer and gives the rational analysis and design. This article gives some design and research to improve its performance and also presents some parameter optimization schemes. In the passive mixer design, this article mainly gives some structural design and research. For the demands of the active mixer and passive mixer for the LO-Buffer are different, the design of the respective LO-Buffer is different from each other.The design and research of this article and the final mixer’s tape-out are based on the0.35μM JAZZ BiCMOS process. The mixer’s layout area is0.34*0.3mm2, the LO-Buffer’s layout area is0.3*0.15mm2. The layout simulation results show that the mixer’s performance are:+10.8dBm IP1dB,+19.4dBm IIP3,8dB DSB noise figure and1.5dB conversion gain.