Clock generation

• Clock signal are the heartbeats of digital systems. A simple technique used for on-chip generation of a primary clock signal would be using a ring oscillator.

• The simple inverter based cascade produces complementary clocks Φ and ϕ ̅ from the signal input clock signal.

  

• The figure below shows a simple RS-FF clock generator that generates clk1 and clk2 from original clock signals.

  

• In order to improve the driving ability of clock generator, they are buffered. The figure below shows buffered clock generator. This would increase the time between the rising edges.