A Versatile, Low Power, High Performance BiCMOS MIMO/Diversity Direct Conversion Transceiver IC for WiBro/WiMAX (802.16e)

Locher, Miriam A.; Kuenen, J.C.; Daanen, A.; Visser, H.A.; Essink, B.; Vervoort, P.P.; Kopmeiners, R.; Alkema, W.; Redman-White, W.; Balmford, R.; Waffaoui, Rachid El

doi:10.1109/jssc.2008.925610

Cited by 13 publications

(4 citation statements)

References 5 publications

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“…However, for 10 GHz and for n > 15 the total capacitance starts to exhibit a saturation effect as n increases. This is due to the Quality Factor decreasing below 15.5 (see (9)). Note that for n > 37 the total capacitor actually starts to decrease as n increases.…”

Section: Figures 5(a) and (B)mentioning

confidence: 99%

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Extending the Frequency Tuning Range of VCOs Using Varactor Arrays: Design Guidelines

Moura

2011

Circuits Syst Signal Process

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Trim-capacitor cells implemented with MOS varactors are a simple means of extending the frequency tuning range of LC-VCOs in Integrated Circuit design. However, the decrease of the Quality Factor for a large number of trim-capacitor cells can reduce this extension and can also prevent the start-up of the VCO. Thus, in this paper we derive simple and effective design guidelines which allow us to estimate the maximum number of trim-capacitor cells for a required Quality Factor.

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Section: Figures 5(a) and (B)mentioning

confidence: 99%

“…Frequency tuning range extension can be achieved by using tapped inductors switching techniques [10], by using trim-capacitor cells [8,9,15], by using various LC VCOs [13], or a combination of the last two techniques [5]. Using trim-capacitor cells is usually an attractive solution given its relatively small area.…”

Section: Introductionmentioning

confidence: 99%

Extending the Frequency Tuning Range of VCOs Using Varactor Arrays: Design Guidelines

Moura

2011

Circuits Syst Signal Process

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“…A larger transistor size in the divider is commonly determined to diminish current mismatch. Moreover, calibration techniques [19][20][21][22] such as pre-distortion or postdistortion are also supposed to be implemented in a transmitter chain to eliminate the sideband signal. The current mode logic (CML) divide-by-2 circuit with I/Q phase calibration mechanism, is therefore proposed to obtain the precise quadrature signals, as shown in Fig.…”

Section: I/q Dividermentioning

confidence: 99%

A calibrated direct conversion front-end transmitter with resonant matching techniques for mobile WiMAX/WiBro applications

Chang

Jou

2011

Analog Integr Circ Sig Process

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A direct conversion front-end transmitter with the properties of high linearity and high single sideband rejection ratio is described in this paper. The transmitter employs two resonant matching techniques to improve its operating bandwidth. The first resonant circuit design is applied at the inter-stage of the LO input buffer in order to achieve a wideband frequency response which ranges from dc to 6 GHz. The second resonant circuit is applied at the power amplifier (PA) driver output stage to increase the matching bandwidth and meet both the Worldwide Interoperability for Microwave Access (WiMAX) and Wireless Broadband (WiBro) applications simultaneously. In addition, the sideband signal and carrier leakage of this transmitter are further minimized by a proposed calibration circuit design to achieve the error vector magnitude (EVM) specifications. The measured single sideband performance with calibration mechanism demonstrates approximately 15 dB improvement on sideband and carrier suppression. The rejected sideband and carrier signals can be up to 55.19 and 56.31 dBc, respectively. The measured dynamic gain range of the transmitter is 53 dB in 1-dB step with a maximum relative gain error lower than 0.4 dB. The transmitter delivers ?0.766 dBm output power with EVM of -34.687 dB for the orthogonal frequency division multiple access (OFDMA) 64QAM-3/4 modulated signals. The measured constellation is minimized to be\1.5% with output power from -2.3 to -36.2 dBm.

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“…Due to the excellent performance in integration and power saving, a direct-conversion-type receiver is expected to be predominant for future mobile devices [13], [14]. In case the MT utilizes a heterodyne-type receiver, the intermediate frequency (IF) must be known a priori to estimate the frequency of the received LO leakage signal.…”

Section: A Detection Environment and Proposed Techniquementioning

confidence: 99%

An RF Receiver Detection Technique for Cognitive Radio Coexistence

Park

Larson

Milstein

2010

IEEE Trans. Circuits Syst. II

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A Versatile, Low Power, High Performance BiCMOS MIMO/Diversity Direct Conversion Transceiver IC for WiBro/WiMAX (802.16e)

Cited by 13 publications

References 5 publications

Extending the Frequency Tuning Range of VCOs Using Varactor Arrays: Design Guidelines

Extending the Frequency Tuning Range of VCOs Using Varactor Arrays: Design Guidelines

A calibrated direct conversion front-end transmitter with resonant matching techniques for mobile WiMAX/WiBro applications

An RF Receiver Detection Technique for Cognitive Radio Coexistence

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