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We fabricated a multiband transceiver for mobile WiMAX in 90-nm CMOS technology. It operates at three RF bands (2.3/2.5/3.5 GHz) with a large dynamic range. We adopted a double conversion receiver that can switch lower and upper local modes. An image rejection ratio (IRR) tunable single side-band (SSB) mixer was used to achieve over 50 dB IRR. The RCE for 2.5 GHz at -71.5 dBm input was -28.7 dB and...
We fabricated a fully integrated WiMAX transceiver in a 90-nm CMOS that can reduce balun and matching network components on an RF module board. Output linearity of up to 12 dBm and a wide variable gain range of 60 dB were achieved using a single-ended signal interface for the PA driver of the transmitter. A combination of a class AB amplifier and a class C amplifier is used for the driver to widen...
A 90-nm CMOS motion estimation (ME) processor was developed by employing dynamic voltage and frequency scaling (DVFS) to greatly reduce the dynamic power. To make full use of the advantages of DVTS, a fast ME algorithm and a small on-chip DC/DC converter were also developed. The fast ME algorithm can adaptively predict the optimum supply voltage (Vd) and the optimum clock frequency (fc.) before each...
To improve the tuning range and phase noise in W-band CMOS voltage-controlled oscillators (VCOs), we propose a new ring-shaped transmission line for the LC tank. As a result, a VCO with a 76.5 GHz center frequency, a tuning range of 7% and a phase noise of -110.6 dBc/Hz was realized by using a 90 nm CMOS 1P6M process.
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