Patent ID: 6157180
Filing Date: 2000-12-05
Classification: G05F,H03K

Abstract:
An apparatus including a power supply regulator circuit with increased rejection of variations and noise in power supply voltage, comprising:a power supply terminal configured to couple to a power supply and convey therefrom a supply voltage and a supply current;a regulated circuit terminal configured to convey a regulated voltage and a first current;a current replication circuit, coupled between said power supply and regulated circuit terminals, configured to receive said supply voltage, said supply current and said regulated voltage and in accordance therewith provide said first current and a second current, wherein said first and second currents are substantially mutually proportional; anda voltage buffer circuit, coupled to said regulated circuit terminal, configured to receive and buffer a reference voltage and in accordance therewith provide said regulated voltage;wherein variations and noise in said supply voltage appear as differences between said supply and regulated voltages across said current replication circuit and are thereby substantially prevented from appearing in said regulated voltage.