Abstract
We present an integrated clock synthesizer in SiGe:C BiCMOS technology. The synthesizer is aimed at low-jitter applications requiring a wide continuous frequency range at low power consumption. It uses an nMOS VCO with an LC tank and differential tuning followed by a bipolar dual-modulus prescaler. The circuit draws 28 mA from a 2.5 V supply. The measured rms output jitter of the PLL was below 2 ps over the whole tuning range from 4.9 to 6.1 GHz.
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