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The high phase noise of ring oscillators has generally discouraged their use in RF synthesis. This paper introduces an integer-N synthesizer that employs a type-I loop to achieve a wide bandwidth, allowing the use of ring oscillators, and a master-slave sampling loop filter along with harmonic traps to suppress spurs. A 2.4 GHz prototype fabricated in 45 nm digital CMOS technology provides a loop...
Recent developments in RF receiver design have eliminated all on-chip inductors except for that used in the local oscillator. This paper addresses this "last inductor" problem and proposes an integer-N synthesizer architecture that achieves a phase noise and a figure of merit (FOM) comparable to those of LC-VCO-based realizations.
The use of multi-tone signaling can avoid the high loss of FR4 traces beyond 10 GHz while confining the task of equalization to 2.5-GHz-wide subchannels. This paper presents multi-tone transceiver design issues and derives performance requirements such as linearity, sensitivity, quadrature mismatches, and phase noise. Possible transmitter and receiver implementations are described and a critical interference...
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