Abstract
Carrier aggregation is one of the key features to increase the data rate given a scarce bandwidth spectrum. This paper describes the design of a high performance receiver suitable for carrier aggregation in LTE-Advanced and future 5 G standards. The proposed architecture is versatile to support legacy mode (single carrier), inter-band carrier aggregation, and intra-band carrier aggregation. Performance with carrier-aggregation support is as good as legacy receivers. Contradicting requirements of high linearity and the low noise is satisfied with the single-gm receiver architecture in addition to supporting carrier aggregation. The proposed cascode-shutoff low-noise trans-conductance amplifier (LNTA) achieves 57.1 dB voltage gain, 1.76 dB NF (noise figure) , and - 6 . 7 dBm IIP3 (Third-order intercept point) with the power consumption of 21.3 mW in the intra-band carrier aggregation scenario. With legacy mode, the same receiver signal path achieves 56.6 dB voltage gain, 1.33 dB NF, and - 6 . 2 dBm IIP3 with a low power consumption of 7.4 mW.
Highlights
The ever increasing data crunch in wireless communication necessitates the means to increase the data rate with spectral efficiency
The high-order modulation format is able to offer faster data rates and a higher level of spectral efficiency, but practically, modulation format is dictated by the link-budget, signal-to-noise ratio (SNR), and transceiver performance
carrier aggregation (CA) has been adopted by the Long-Term Evolution (LTE) standard for cellular systems, and is being extended to Licensed-Assisted Access (LAA) and LTE in Unlicensed spectrum (LTE-U)
Summary
The ever increasing data crunch in wireless communication necessitates the means to increase the data rate with spectral efficiency. The high-order modulation format is able to offer faster data rates and a higher level of spectral efficiency, but practically, modulation format is dictated by the link-budget, signal-to-noise ratio (SNR), and transceiver performance. High linearity of the receiver is the capacity to handle large signal interferences and jammers with the simultaneous reception of small desired signals. These considerations call for new innovations on several fronts, from the circuit to the architectural level. We propose a high-performance receiver architecture supporting legacy single-carrier operation, inter-band carrier aggregation, and intra-band carrier aggregation.
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