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A new frequency synthesizer architecture with low-power and very short settling time is introduced for 2.4GHz ZigBee applications. It uses two-point channel control with divider control and direct VCO control. A DAC with tunable gain is used along with a linearized varactor for the direct VCO control path. Despite the use of an integer-N architecture with 50kHz loop bandwidth, we have achieved a frequency...
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