Clock and data recovery unit based on class B amplifier

Apparatus for recovering and generating clock and data signals from information received on a transmission line comprising;

• clock detecting means for recovering and generating a clock signal from the received transmission line information;
• data detecting means enabled by the recovered clock signal for recovering and generating data contained in the received transmission line information;
• and
• directional coupling means having a pair of magnetically coupled microstrip transmission lines positioned in a parallel relationship for magnetically coupling the transmission line information received on one microstrip line to the other microstrip line for transmission to the clock and data means

Apparatus for recovering and generating clock and data signals from information received on a transmission line, comprising;

• directional coupling means having a pair of magnetically coupled microstrip transmission lines positioned in a parallel relationship for coupling a transmission line to the data and clock generating apparatus;
• a class B narrow band amplifier connected to one of the directional coupling microstrip transmission lines for receiving magnetically coupled transmission line information and amplifying positive and negative pulses of the received transmission line information as a distorted sine wave;
• circuitry connected to an output of the class B band amplifier for defining spectral power density signals corresponding to a clock rate of the received transmission line information and defining clock signals from the distorted sine wave;
• a clock directional coupler coupled to a peak detector and having magnetically coupled microstrip transmission lines for receiving the defined clock signals and magnetically coupling the defined clock signals to the peak detector for determining an absence of the magnetically coupled defined clock signals as a loss of transmission line information indication;
• a variable magnetic delay line and narrow band amplifier connected to the clock directional coupler wherein the magnetic delay line has a pair of magnetically coupled microstrip transmission lines with one microstrip transmission line having an input port connected to the narrow band amplifier for receiving the defined clock signals and a through port connected through a first varactor diode to ground and with another microstrip transmission line having a coupled port connected through a second varactor diode to ground and an isolated port output wherein a network having one end connected to the through port of the one microstrip transmission line and an opposite end connected to the isolated port of the other microstrip transmission line enables signals applied to a center point of the series network to vary the phase of the received clock signals;
• a combination of a narrow band amplifier coupled to a narrow band filter with the narrow band amplifier and filter combination having an input connected to the isolated port output of the variable magnetic delay means for amplifying the clock signals and eliminating high order harmonics appearing in the clock signal input;
• data detecting circuitry having a memory device with one input connected to the directional coupler means other microstrip transmission line for receiving the transmission line information output of the directional coupling means and with another input for receiving control signals determining magnitudes for recording the transmission line information and regenerating data signals from the received transmission line information in response to the generated clock signals;
• and
• a data detecting directional coupler having a pair of magnetically coupled microstrip transmission lines one of which receives the recovered clock signals for applying the received recovered clock signals to a clock input of the memory device and another one of the microstrip transmission lines for magnetically coupling the recovered clock signals to a peak detector connected thereto for detecting an absence of magnetically induced clock signals as a loss of clock signal.