Local mid-rail generator circuit

Details Local mid-rail generator circuit Local mid-rail generator circuit

1993-12-02

1994-11-08

Wambach, Margaret R.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327530, 327306, H03K 301

Patent

active

053629884

ABSTRACT:
A voltage generation circuit (10) is provided including a first plurality of transistors (12, 14, 16, 18) having source/drain paths coupled in series to establish a first current path between a first voltage rail and a second voltage rail, the first transistors (12, 14, 16, 18) matched to provide a preselected intermediate voltage at a node (A) along the first current path. A second plurality of transistors (20, 22, 24, 26) are provided having source/drain paths coupled in series to establish a second current path between the voltage rails, and coupled to the first transistors (12, 14, 16, 18) such that current flow in the second current path selected ones of mirrors current flow in the first current path, the second plurality of transistors (20, 22, 24, 26) matched to provide a voltage substantially equal to the intermediate voltage at a node (B) along the second current path. A pair of output transistors (28, 30) are provided having source/drain paths coupled in series to establish a third current path between the voltage rails. A first one of the output transistors (28) is coupled as a current mirror with a first one of the second plurality of transistors (22), and a second one of the output transistors (30) is coupled as a current mirror with a second one of the second plurality of transistors (24). The first and second output transistors (28, 30) have channel width to length ratios n times the channel width to length ratios of the first and second ones (22, 24), respectively, of the second plurality of transistors to provide a voltage V.sub.AGND substantially equal to the intermediate voltage coupling the source/drain paths of the output transistors (28, 30).

REFERENCES:
patent: 4442398 (1984-04-01), Bertails et al.
patent: 4634894 (1987-01-01), Shu et al.

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