PLL ECL phase-frequency detector with ECL charge pump

Phase-frequency detector (PFD) forms control signal for VCO tuning. PFD compares phases of divided VCO signal and divided reference oscillator signal and detects phase difference. Charge pump generates pulses for loop filter. Reference frequency 0.32…10 MHz. Output current is 41...142.5 uA.
The block is fabricated on iHP SiGe BiCMOS 0.25 um (SGB25V) technology.

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