Delay locked loop

A method comprising:

• receiving a first pulse having a first width by a delay line, and wherein the delay line includes a plurality of delay cells;
• generating a plurality of second pulses by the delay line in response to the first pulse, wherein each second pulse has a second width, and wherein the first width is greater than the second width;
• generating first and second delay pulses by the delay line;
• and
• adjusting a delay for each delay cell in the delay line if a rising edge of the second delay pulse is misaligned with a falling edge of the first delay pulse.

An apparatus comprising:

• radar circuitry that is configured to transmit and receive terahertz radiation;
• and
• a baseband circuit that is coupled to the radar circuitry so as to digitize a baseband signal, wherein the baseband circuitry includes:
• a in-phase (I) channel;
• a quadrature (Q) channel;
• and
• a clock circuit having a clock generator and a delay locked loop (DLL), wherein the DLL includes:
• a delay line having an input terminal, a control input terminal, a first control output terminal, a second control output terminal, and a plurality of taps, wherein the delay line is configured to receive a first pulse having a first width at its input terminal from the radar circuitry, and wherein the delay line is configured to output a first delayed pulse through the first control output terminal, and wherein the delay line is configured to output a second delayed pulse through the second control output terminal, and wherein each tap is coupled to the I and Q channels so as to output a second pulse having a second width in response to the first pulse, and wherein the first width is greater than the second width;
• a PFD that is coupled the first control output terminal and the second control output terminal so as to receive the first and second delayed pulses;
• a charge pump that is coupled to the PFD;
• and
• a filter that is coupled to the charge pump and the control terminal of the delay line.