ALL-DIGITAL CLOCK DATA RECOVERY DEVICE AND TRANSCEIVER IMPLEMENTED THEREOF

摘要

the present invention is a digital filter circuit (digital filter) and a digitally controlled oscillator (DCO; digitally controlled oscillator) for used in the circuit as a whole, and relates to a clock data restoring digital circuitized, a digitally controlled oscillator in accordance with the present invention is provided with a plurality of the drive chain, variable between a power supply voltage and an inverter for supplying a power supply current to each of the inverters configure the switching matrix by changing the supply resistance to tune the oscillation frequency. ; Here, a variable resistance switching matrix is implemented using a PMOS transistor, but the array, at a low level and the high level of the frequency tuning step the frequency of the tuning step is to insert a resistor between the vertical column and the column of the switching matrix in order to equalize each other. In addition, it implements dithering circuit using a sigma-delta modulator, the first to address the jitter problem, and tuning a digitally controlled oscillator with a small number of lines by applying the route segment thermometer system.