초록 ▼

In a CMOS structure a pair of BJTs are provided with lateral collectors and operated at different current densities. The lateral collectors are coupled to a current mirror load which provides a single ended output node. The pair bases are coupled together and to the current mirror load input so that

In a CMOS structure a pair of BJTs are provided with lateral collectors and operated at different current densities. The lateral collectors are coupled to a current mirror load which provides a single ended output node. The pair bases are coupled together and to the current mirror load input so that the lateral BJT collectors operate at low potential. A current source supplies tail current and a resistor is coupled in series with the low current density BJT. The single ended output node is coupled to a current mirror that determines the BJT tail current. The circuit therefore has a negative feedback loop around the BJTs that will stabilize operation so that DBE appears across the resistor. The resistor can be chosen so that the overall circuit temperature coefficient can be established at a desired value.

대표청구항 ▼

A bias current generator circuit for implementation in CMOS construction, said circuit comprising: first and second BJTs, each one having a base, an emitter, a substrate dedicated collector and a lateral collector with the two collectors sharing the emitter current; means for operating said first BJ

A bias current generator circuit for implementation in CMOS construction, said circuit comprising: first and second BJTs, each one having a base, an emitter, a substrate dedicated collector and a lateral collector with the two collectors sharing the emitter current; means for operating said first BJT at a higher emitter current density than said second BJT; means for coupling the bases of said first and second BJTs together and to said lateral collector of said first BJT; first and second IGFETS coupled together as a current mirror load for said lateral collectors of said BJTs; means for coupling the emitter of said first BJT to a tail current source; a resistor coupled between the emitter of said second BJT and said tail current source; and means for modulating said tail current source in response to the potential at said second BJT lateral collector whereby said circuit is stabilized and the potential across said resistor is PTAT.