Patent ID: 6198312
Filing Date: 2001-03-06
Classification: H03K

Abstract:
A circuit for comparing an input voltage to a reference voltage comprising:a bias network connected to a high voltage terminal and a low voltage terminal, said bias network including a first current path having a first current control element and a first transistor that are connected in series between said high voltage terminal and said low voltage terminal, said bias network being configured to generate said reference voltage on said first current path;a comparison current path connected between an input voltage terminal and said low voltage terminal, said comparison current path including a series connection of a comparison current control element and an active transistor, said comparison current control element and said active transistor being configured to substantially replicate conditions on said first current path of said bias network in said comparison current path when an input voltage applied to said input voltage terminal is substantially equivalent to said reference voltage generated by said bias network; andan output terminal connected to said comparison current path between said comparison current control element and said active transistor, said output terminal being situated to generate an output signal in response to said input voltage applied to said input voltage terminal, said output signal being dependent on said input voltage in comparison to said reference voltage generated on said first current path of said bias network.