Variable frequency pulse generator - has programmable frequency divider between two fixed frequency dividers

摘要

The variable-frequency pulse generator has a programmable frequency divider (SM) coupled by its input via a fixed freq. divider (T1) to the pulse source (Ig) and by its output via a negator (GN) to one input of an AND circuit (Vs). The AND circuits second input is connected directly to the pulse source and its output is coupled to a second fixed freq. divider (T2). The range over which the frequency can be adjusted if the programmable divider has unity denominator is given by f/m.k, where f is the pulse source frequency and m and k the denominators of the fixed frequency dividers.