A voltage-controlled double input of oscillator with compensated two point frequency

摘要

A dual input voltage controlled oscillator ("VCO") suitable for use in clock and data recovery ("CDR") systems operating at 100s to 1, 000s of MB/sec is described. When a PLL using this VCO is locked onto a data stream of a fixed bit rate, the bang/bang frequency of the VCO does not vary due to process and temperature variation occuring either during manufacture or operation. The VCO is also relatively insensitive to supply voltage variations.