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Background: International literature and clinical practice have referred to Marshall and Tanner data to define the physiological age at onset of puberty. A study in the United States (1997) showed an anticipation in pubertal onset, whereas several European studies did not confirm this trend. Aim: To describe the onset of secondary sexual characteristics in a large Italian population of girls and...
The spectrum allocated for the operation of cellular services is country dependent and fragmented in several frequency bands. Mobile phones, to be usable globally, are therefore required to support many bands. The lack of suitable tuneable pre-selection filters and duplexers mandates the use of a large number of low-noise amplifiers (LNAs) in the receiver section of the transceiver. Minimization of...
With growing WCDMA adoption there is a strong demand to reduce the cost of WCDMA terminals. Contributing to the relatively high WCDMA terminal cost is the low integration of today's WCDMA radios. Since WCDMA is an FDD system the transmitter and receiver are on simultaneously. A duplexer is used to isolate the receiver from the transmit signal but the isolation of small low-cost duplexers is limited,...
A direct-conversion multi-band TX for 1710 to 2025MHz is implemented in a 0.18mum CMOS process with post-passivation inductors. An on-chip balun and noise of -163dBc/Hz at 190MHz offset enable the PA to be driven directly with no SAW filter. A tapped attenuator provides >60dB gain control at RF.
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