Fully integrated W-CDMA IF receiver and IF transmitter including IFsynthesizer and on-chip VCO for UMTS mobiles

摘要

A fully integrated, dual intermediate frequency (IF) receiver andnan IF transmitter, each with on-chip IF synthesizer, for use innthird-generation wide-band code division multiple access (W-CDMA)nmobiles has been implemented in a standard, high-frequency, Si-bipolarnprocess with an fT of 25 GHz. The IF receiver (318 MHz) andnIF transmitter (285 MHz) include a complete phase-locked loop (PLL) andnon-chip voltage-controlled oscillator (VCO) with integrated varactorsnand transformers. The VCOs are used for on-chip local oscillator (LO)ngeneration and operate at four times IF, 1272 MHz and 1140 MHz, for Rxnand Tx, respectively. Fully integrated, active, analog base-band filtersnfurther increase functionality and integration level. In the receiver, anchannel select filter, composed of a fifth-order Chebyshev lowpassnfilter and a first-order all-pass filter, is implemented. In thentransmitter, a fifth-order Butterworth low-pass filter functions as anreconstruction filter. Both devices operate on 2.7-3.3-V supply. Thendesigns comply with ARIB W-CDMA and UMTS standards. Each chip is mountednin a small outline, 32-pin, leadless surface mount package