Stable current source circuit with compensation circuit
AssigneeWinbond Electronics Corp.
InventorLi-Te Wu
Life of this patent
Estimating the term…
Abstract
A stable current source circuit with a compensation circuit, comprising: a PMOS current mirror, connected to a power supply so as to output a stable current; an NMOS current mirror, connected to a third bipolar junction transistor and a fourth compensation resistor; a third bipolar junction transistor, the emitter of the third bipolar junction transistor connected to the NMOS current mirror and both of the base and the collector grounded; and a fourth compensation resistor, interconnected between the NMOS current mirror and the compensation circuit. Alternatively, a compensation capacitor can be added so as to obtain better stability.
Claims17
A stable current source circuit with a compensation circuit, comprising:
- a PMOS current mirror, connected to a power supply so as to output a stable current;
- and
- an NMOS current mirror, connected to the PMOS current mirror, a third bipolar junction transistor, and a fourth compensation resistor,
- wherein the emitter of said third bipolar junction transistor is connected to said NMOS current mirror and both the base and the collector of said third bipolar junction transistor are grounded,
- wherein said fourth compensation resistor is interconnected between said NMOS current mirror and said compensation circuit, and
- wherein said compensation circuit includes a third resistor, and a second capacitor.
A stable current source circuit with a compensation circuit, comprising:
- a PMOS current mirror, connected to a power supply so as to output a stable current;
- and
- an NMOS current mirror, connected to said PMOS current mirror, a fourth bipolar junction transistor, and a sixth compensation resistor,
- wherein the emitter of said fourth bipolar junction transistor is connected to said NMOS current mirror and both the base and the collector of said fourth bipolar transistor are grounded,
- wherein said sixth compensation resistor is interconnected between said NMOS current mirror and said compensation circuit;
- and
- further comprising a fourth compensation capacitor, interconnected between the source and the drain of an NMOS transistor of said NMOS current mirror.
Dependencies are inferred from the claim text.