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This paper presents a SigmaDelta DAC based transmitter (TX) baseband for 802.11n / 802.16e with channel filtering and gain control performed in the digital domain. The effect of circuit imperfections on TX EVM is analyzed for a robust line-up with gain control and the design of the high speed SigmaDelta modulator is described. The SigmaDelta DAC fabricated in a 90 nm CMOS process operates up to 3...
The presented digital RF signal generator in 90 nm CMOS uses 1-bit DeltaSigma modulation and targets mobile communication terminals. A 50 MHz bandwidth centered on 1 GHz can be achieved when the circuit is clocked at 4 GHz. Signals up to 3 GHz can be synthesized when using the first image band. The peak output power into a 100 Omega diff. load is 3.1 dBm with 53.6 dB SNDR. The digital core employs...
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