Filter circuit for generating a VCO control voltage responsive to the output signals from a frequency/phase discriminator

摘要: A filter circuit is driven by two digital phase responsive output signals from the frequency/phase discriminator of a phase-locked loop (PLL) circuit. The controlled current paths first n-conducting transistor, second p-conducting transistor and are connected in that order between plus minus poles source supply voltage. common connection to as diodes with gate transistor. across series RC pole signal fed via capacitor. arrangement an inverter applied resistor capacitor In way range control voltage substantially greater than voltage, coupling-in avoided.