A highly digitized multimode receiver architecture for 3g mobiles

Equalization of Third-Order Intermodulation Products in Wideband Direct Conversion Receivers

“…The actual specification that must be met for UMTS is that of the sensitivity test, whose results are often predicted from input-referred error tests by the relations described in [7], [17], [39]. With 1.8 dB the receiver must achieve for 118.8 dBm at the LNA input under typical conditions and 115.8 dBm under worst-case blocking.…”

“…For example, the behavior of digital circuitry is relatively insensitive to process variations, the continued scaling of CMOS processes has rendered baseband digital blocks power-competitive compared to equivalent analog blocks [16], and digital circuits facilitate the implementation of reconfigurable multimode receivers [17].…”

A fully integrated dual-band CMOS LNA for IEEE802.16a

“…To cover the UWB band, the passband (ω L , ω U ) centered on ω 0 must span 5 to 10 GHz. When the passband ratio (ω L − ω U )/ω 0 > 1, the values of the reactive elements are related to the cutoff frequencies as follows: [5]. Now the right half of this bandpass ladder consists of the very same elements, that is, L 2 , C 2 , and R in series, which comprise the small-signal equivalent circuit at the gate terminal of a degenerated transistor as shown in Fig.…”

“…Instead of a resonator, this matching network is based on a doubly-terminated LC ladder. In fact, the input impedance Z in is embedded in 2 nd order bandpass LC ladder filter to resonate its reactive part over the whole band, from 5 GHz to 10 GHz [5]. For flexibility of the design, an inductor L g is placed in series with the gate, and a capacitor C par is added in parallel with the gate-source of the amplifying transistor.…”

A Low-Power ΔΣ Modulator with Low Capacitor Spread for Multi-Standard Receiver Applications

“…To digitize the analog channel signal of the two most commonly used mobile phones from the 2 nd and 3 rd generations, e. g., GSM and UMTS communication standards, with different bandwidth, a reusable, high linear, high resolution programmable ADC structure must be used. The ∆Σ ADCs are the best option to achieve a high required dynamic range (DR) for GSM (above 12 bit as reported in [1], [4], [6]) with acceptable power consumption. For UMTS, pipeline ADCs or Continuous-time ∆Σ modulators with moderate resolution about 8-10 bit are assumed to be more efficient [7], [1].…”