Patent ID: 7893734

Claim:
An integrated circuit providing a power on reset (POR) signal with respect to a supply voltage comprising: a bias current generating (BCG) stage generating a bias current (Ibias) including a first MOS transistor (M 7 ) having a source connected to a first voltage source (Vcc), a gate and a drain, a first diode connected MOS transistor (MD) having a drain and gate connected to said drain of said first MOS transistor (M 7 ) and a source connected to a second voltage source (OS), a second diode connected MOS transistor (M 6 ) having a source connected to said first voltage source (Vcc) and a commonly connected gate and drain, a second MOS transistor (M 5 ) having a drain connected to said commonly connected gate and drain of said second diode connected MOS transistor (M 6 ), a source and a gate, a resistor connected between said source of said fifth MOS transistor (M 5 ) and said second voltage source (OS); and an output stage (OS) having a third MOS transistor (M 1 ) having a source connected to a first voltage source (Vcc), a gate connected to said gate of said first MOS transistor (M 7 ) and a drain, a fourth MOS transistor (M 2 ) having a source connected to said drain of said third MOS transistor, a gate connected to said drain of said first MOS transistor (M 7 ) and a drain connected to a POR output node (POROUT), and a fifth MOS transistor (M 3 ) having a drain connected to said drain of said fourth MOS transistor (M 2 ), a gate connected to said gate of said fourth MOS transistor (M 2 ), and a source connected a second voltage source (OS).