초록 ▼

Jitter attenuators (100) with a phase detector (104) to control a crystal oscillator to remove jitter wherein the phase detector includes both a sequential phase/frequency detector (200) of low transistor count and an arrangement of two sequential phase/frequency detectors (198 and 200) to increase

Jitter attenuators (100) with a phase detector (104) to control a crystal oscillator to remove jitter wherein the phase detector includes both a sequential phase/frequency detector (200) of low transistor count and an arrangement of two sequential phase/frequency detectors (198 and 200) to increase gain and two drivers for the crystal oscillator.

대표청구항 ▼

[ I claim:] [4.] A phase detecting system comprising:a first phase-frequency comparator having at least two inputs, one input connected to a first node and another input connected to a second node, said first phase-frequency comparator having an output;a second phase-frequency comparator having at l

[ I claim:] [4.] A phase detecting system comprising:a first phase-frequency comparator having at least two inputs, one input connected to a first node and another input connected to a second node, said first phase-frequency comparator having an output;a second phase-frequency comparator having at least two inputs, one input connected to an output of a first inverter and another input connected to an output of a second inverter, wherein an input of said first inverter is connected to said first node and wherein an input of said second inverter is connected to said second node, said second phase-frequency comparator having an output; anda logic circuit for producing an output signal, wherein the output signal is formed by digitally combining an output of said first phase-frequency detector and an output of said second phase-frequency detector.