A Prototype SAW-Less LTE Transmitter With a High-Linearity Modulator Using BPF-Based I/Q Summing and a Triple-Layer Marchand Balun

A 65-nm CMOS-technology-based surface-acoustic-wave filterless transmitter (TX) for a long-term evolution (LTE) system was developed and performance tested. The TX incorporates both a passive quadrature modulator (QMOD) using bandpass filter (BPF)-based in-phase/quadrature (I/Q) signal summing and a...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2015-12, Vol.63 (12), p.4090-4097
Main Authors: Nakamura, Takahiro, Kitazawa, Naoki, Kohira, Kaoru, Ishikuro, Hiroki
Format: Article
Language:English
Subjects:
Bandpass filter (BPF)-based in-phase/quadrature (I/Q) summing
Impedance
Impedance matching
Long Term Evolution
long-term evolution (LTE)
Modulation
Noise
Prototypes
surface acoustic wave (SAW)-less
Transmission line measurements
triple-layer Marchand balun
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Summary:A 65-nm CMOS-technology-based surface-acoustic-wave filterless transmitter (TX) for a long-term evolution (LTE) system was developed and performance tested. The TX incorporates both a passive quadrature modulator (QMOD) using bandpass filter (BPF)-based in-phase/quadrature (I/Q) signal summing and a small triple-layer Marchand balun. The passive operation and BPF-based I/Q summing, respectively, contribute to low noise performance and high input impedance (seen from the baseband signal), resulting in low receiver (RX) band noise and high linearity of the TX. The triple-layer Marchand balun contributes to the small area of the TX. A prototype LTE TX using the QMOD and the balun exhibits in-specification RX-band noise ( 161.6 dBc/Hz), a high output third-order intercept point (OIP3=20.5 dBm), and a small chip area (0.224 mm 2 ).
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2015.2489214