A tri-band (2100/1900/800 MHz) single-chip cellular transceiver for WCDMA/HSDPA

Kaczman, D.; Dozier, C. M.; Godambe, N.; Shah, Manish; Guimarães, Homero Nogueira; Rachedine, M.; Alam, Mohsin; Han, Lu; Shepherd, Wayne; Cashen, D.; Ganger, J.; Couglar, K.; Getka, B.; Brotkowski, E.; Wong, Derek; Hayes, David L.

doi:10.1109/rfic.2005.1489784

Cited by 19 publications

(8 citation statements)

References 4 publications

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“…A low EVM of less than 5% is maintained over a wide input power range. Figure 10.2.5 compares the performance of this receiver with previously published receivers [1][2][3][4][5]. With similar supply current, this receiver achieves better noise, linearity and EVM.…”

mentioning

confidence: 91%

Single-Chip Tri-Band WCDMA/HSDPA Transceiver without External SAW Filters and with Integrated TX Power Control

Tenbroek¹,

Strange²,

Nalbantis³

et al. 2008

2008 IEEE International Solid-State Circuits Conference - Digest of Technical Papers

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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, with a guaranteed isolation at the TX frequency of not more than 52dB. For a Class-3 terminal with 2dB TX path loss due to duplexer and switch, the power at the PA output is +26dBm and the receiver will see a TX leakage of up to −26dBm. Today's state-ofthe-art WCDMA transceivers [1-3] deal with the TX blocking problem by using an external TX SAW filter to eliminate TX noise in the RX band and an external LNA and RX SAW filter to achieve sufficient RX linearity. A typical tri-band transceiver requires 6 SAW filters and 3 LNAs. The tri-band WCDMA transceiver presented here eliminates all external SAW filters and LNAs and achieves excellent performance with standard low-cost duplexers.In the presence of a strong modulated TX blocker at the receiver input the total noise at the output of the receiver consists of four contributions: the IC RX noise figure, the TX noise in the RX band [6], the reciprocal mixing of the TX blocker and the IM2 products arising from the modulated TX blocker. Using the method described in [4] and targeting only a 0.2dB noise-figure degradation at maximum TX power due to reciprocal mixing and IM2 products, then the LNA referred receiver requirement is for an IIP2>+50dBm and LO phase noise <−160dBc/Hz. The presence of a CW blocking signal together with the TX signal will produce an in-band spurious response when this blocking signal is either at 0.5× or 2.0× the duplex frequency. To achieve sufficient margin against the requirements [7] an IIP3 of −5dBm is targeted. Figure 10.2.1 shows a block diagram of the transceiver in a tri-band WCDMA application. The transmitter is discussed in detail in [6]. The receiver front-end is shown in detail in Fig. 10.2.2. A singleended LNA is used to interface to standard single-ended duplexers. The LNA has a high IP3 common-source input stage, cascode gain control and a notch filter at the source of the cascode. A low-noise Qenhancement circuit is used to improve notch selectivity. Together with the LC load this notch filter provides additional attenuation of the TX leakage. The LNA is followed by a high IP3 transconductor and a passive mixer optimized for high IP2. A low-pass filter is inserted between the passive mixer and the transimpedance amplifier to further improve out-of-band IP3. The transimpedance amplifier also implements the first real pole of a 5 th -order baseband filter. The remaining 4 poles are implemented as two biquads, and a 1 st -order equalizer is added to reduce group-delay variation as shown in Fig. 10.2.1. The overall baseband filter response is optimized for minimum ripple and group-delay variation to maintain low EVM for HSDPA applicat...

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mentioning

confidence: 91%

Single-Chip Tri-Band WCDMA/HSDPA Transceiver without External SAW Filters and with Integrated TX Power Control

Tenbroek¹,

Strange²,

Nalbantis³

et al. 2008

2008 IEEE International Solid-State Circuits Conference - Digest of Technical Papers

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“…This architecture is also suitable for multi-band applications as recently demonstrated [1]. The higher talk time demand is also a new challenge as it calls for the use of efficient amplification chain.…”

Section: Introductionmentioning

confidence: 92%

Fully Integrated Multi-Band W-CDMA Transmitter with Minimum Carrier Leakage and Optimized Power Consumption Mode

Villain

Burg

2006

2006 Proceedings of the 32nd European Solid-State Circuits Conference

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A fully integrated multi-band, 0.25 um BiCMOS direct-conversion transmitter for wide-band code division multiple access (WCDMA) is described. A new approach based on a cascaded attenuator and amplifiers creates the full necessary power range in RF and successfully suppresses the carrier leakage without any calibration needs. The transmitter uses also an optimized power control feature that allows current saving while meeting linearity requirements. The chip provides more than 85 dB power control range in both bands and it is designed to deliver +7 dBm in at 800-900 MHz and +5 dBm at 1700-1900 MHz with 70 mA and 79 mA respectively at nominal supply and temperature. It also provides an error vector magnitude (EVM) of 2.5% and an adjacent channel leakage ratio (ACLR) of -53 dBc in high band and 4.4% EVM with -48 dBc ACLR in low band.Index Terms -Carrier leakage, direct-conversion transmitter, mobile communication, wide-band code division on multiple access (WCDMA), power control

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“…The TX leakage amplified by the LNA creates a linearity/dynamic range issue for the RF mixer. Most state-of-the-art W-CDMA direct-conversion receivers [10,12] deal with TX leakage by using an external interstage RF filter (typically, a SAW) between the LNA and the mixer. As discussed earlier, for a multi-mode design it is important to eliminate the need for an interstage filter in a W-CDMA RX so that it is suitable for the GGE mode as well.…”

Section: Multi-mode Receiver Principles and Rf System Analysis For A mentioning

confidence: 99%

Reduced External Hardware and Reconfigurable RF Receiver Front Ends for Wireless Mobile Terminals

Hueber

Staszewski²

2010

Multi‐Mode/Multi‐Band RF Transceivers for Wireless Communications

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A tri-band (2100/1900/800 MHz) single-chip cellular transceiver for WCDMA/HSDPA

Cited by 19 publications

References 4 publications

Single-Chip Tri-Band WCDMA/HSDPA Transceiver without External SAW Filters and with Integrated TX Power Control

Single-Chip Tri-Band WCDMA/HSDPA Transceiver without External SAW Filters and with Integrated TX Power Control

Fully Integrated Multi-Band W-CDMA Transmitter with Minimum Carrier Leakage and Optimized Power Consumption Mode

Reduced External Hardware and Reconfigurable RF Receiver Front Ends for Wireless Mobile Terminals

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