A direct-conversion receiver IC for WCDMA mobile systems

Reynolds, Scott; Floyd, Brian; Beukema, T.; Zwick, Thomas; Pfeiffer, Ullrich R.; Ainspan, H.

doi:10.1109/bipol.2002.1042887

Cited by 8 publications

(11 citation statements)

References 6 publications

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“…1 Single-transistor LNAs. a Common-emitter [21], b dual-loop-feedback [10], c tank output matching circuit [29], d wideband feed-back [30], e resistive feedback [31], f transformer-feedback [28] for best power transfer. Second among the drawbacks is the low isolation to signals traversing the amplifier in the direction opposite to that intended.…”

Section: Cascode-based Lnasmentioning

confidence: 99%

“…1(c)). Some of the output signal is fed back to the input (between the base and the collector) to further improve the input match [29].…”

Section: Improved Matching Using Resistive Feedbackmentioning

confidence: 99%

“…In most LNAs the gain provided by the amplifier is only controllable in two steps: peak gain, or zero gain. Such LNAs are equipped with a bypass circuit leading to two modes of operation (in [29], for example, the LNA has a gain of 14 or -4 dB).…”

Section: Performance Control In Lnasmentioning

confidence: 99%

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Low-noise amplifiers in wireless communications: state of the art, two new wideband all-active LNAs in SiGe-BiCMOS

Godara

Fabre

2009

Analog Integr Circ Sig Process

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The aim of this paper is three-fold. First, it introduces the low-noise amplifier, its relevance in modern wireless communications receivers and the performance expected of it. Then, it presents an exhaustive review of the existing topologies, presenting their advantages and shortcomings. And finally, it introduces a new class of LNAs, based on current conveyors, describing the founding principle and the performances of two new LNAs, one single-ended and the other differential. Both these new LNAs offer the following notable advantages over existent topologies: total absence of passive elements (and the smallest LNAs in their respective classes); wideband performance, with stable frequency responses from 0 to 3 GHz; easy gain control over wide ranges (0-20 dB). Comparisons with other topologies prove that the new class of LNA implementations greatly advances the state of the art. These amplifiers are ideally suited to today's multiband receivers.

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Section: Cascode-based Lnasmentioning

confidence: 99%

“…1(c)). Some of the output signal is fed back to the input (between the base and the collector) to further improve the input match [29].…”

Section: Improved Matching Using Resistive Feedbackmentioning

confidence: 99%

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Low-noise amplifiers in wireless communications: state of the art, two new wideband all-active LNAs in SiGe-BiCMOS

Godara

Fabre

2009

Analog Integr Circ Sig Process

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“…Non-linearity of a CS amplifier comes mainly from transconductance gm [3]. The iDS in a CS amplifier can be expressed in Taylor series expansion as equation (1).…”

Section: Circuit Descriptionmentioning

confidence: 99%

“…This 5 MHz nominal bandwidth includes a message bandwidth that corresponds to a chip rate of 3.84 Mcps and guard bands that are used for adjacent channels isolation. The spread data modulates the carrier with quadrature-phase-shift keying (QPSK) [1]. The specifications of 3G WCDMA PA are listed in Table I.…”

Section: Introductionmentioning

confidence: 99%

High Power CMOS Power Amplifier for WCDMA

Huang

Lin

2006

APCCAS 2006 - 2006 IEEE Asia Pacific Conference on Circuits and Systems

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In this paper we propose a power amplifier (PA) for high output power and high linearity WCDMA applications. This PA is designed based on a three-stage configuration and an output stage designed by a multiple gated transistor topology. The test chip is simulated and fabricated with the TSMC 0.18pm CMOS process. Simulation results show that the power amplifier achieves 24.4 dB of power gain, 25 dBm of 1dB compression power output, and 27.6 dBm at third order output interception point (OIP3). The power added efficiency (PAE) at gain compression point is 33.5%. The die size is 1.2 x 1.2 mm .

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