Mark Kirschenmann

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Fourth-generation mobile devices use wide channel bandwidths and OFDM modulation to achieve high data rates. In particular, OFDM modulation in LTE20 creates up to 100 Resource Blocks (RB) each containing 12 subcarriers with 15kHz spacing, spread over the channel bandwidth. For an RB with frequency offset f<sub>s</sub> from the LO, transmitter non-linearity(More)
A 90 nm CMOS TX path architected for operation without inter-stage SAW filters is shown. The SAW elimination strategy is purely low noise design but the architecture still achieves DG.09 weighted TX current drain of 50 mA from the battery. The combination of a passive interleaved switching mixer plus digital gain control allows 2% EVM at 2 dbm and 4.2% at(More)
This paper presents some of the challenges unique to a multi-mode transceiver supporting LTE and LTE-Advanced. Implications of combining 2G, 3G and 4G in a single lineup are discussed. RF problems specific to 4G support are discussed and technical examples are given. Specific technical solutions are provided for duplex offset IIP2 in the receiver using(More)
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