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A fractional-N frequency synthesizer in a 0.5-µm BiCMOS technology is presented. A 3-bit 4th order Σ-Δ modulator employs an interpolative architecture with multiple feedback paths and metal-connected multipliers to implement the feedback coefficients, resulting in a simple hardware complexity, lower out-of-band phase noise, a frequency resolution of less than 10-Hz, and agile switching time. The experimental...
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