Reference buffer with multiple gain stages for large, controlled

Details Reference buffer with multiple gain stages for large, controlled Reference buffer with multiple gain stages for large, controlled

1996-04-26

1998-12-29

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330253, 330257, 330260, 330288, 330294, 330311, H03F 134, H03F 142

Patent

active

058545743

ABSTRACT:
A reference buffer suitable for driving switched-capacitor or resistive load circuits provides a very low output impedance. The reference buffer utilizes an amplifier with a very large and controlled transconductance configured in feedback and compensated by a load capacitance. Cascaded gain stages are used to provide a large, controlled transconductance. In one embodiment, a reference buffer amplifier includes a plurality of voltage gain amplifiers connected in cascade and at least one transconductance amplifier connected to a last-connected of the plurality of voltage gain amplifiers. The amplifier may further include at least one current mirror amplifier connected to the at least one transconductance amplifier. In another embodiment, the reference buffer amplifier includes at least one transconductance amplifier and at least one current mirror amplifier cascade-connected to the at least one transconductance amplifier. The amplifiers can be differential or single-ended.

REFERENCES:
patent: 4135162 (1979-01-01), Takahashi
patent: 4952867 (1990-08-01), Anderson et al.
patent: 5182526 (1993-01-01), Nelson
patent: 5212455 (1993-05-01), Pernici et al.
patent: 5285172 (1994-02-01), Okanobu et al.
patent: 5434538 (1995-07-01), Lee et al.
patent: 5451902 (1995-09-01), Huang et al.
Data Sheet entitled, "Complete 12-Bit 1.25 MSPS Monolithic A/D Converter", AD1671, pp. 1-16, Oct., 1993.
Data Sheet entitled, "Complete 12-Bit 10 MSPS Monolithic A/D Converter", AD872A, pp. 1-20, Feb., 1995.

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