Low distortion unity gain amplifier for DAC

Details Low distortion unity gain amplifier for DAC Low distortion unity gain amplifier for DAC

1991-01-15

1993-08-24

Sikes, William L.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307491, 307360, 330258, H03K 522

Patent

active

052392104

ABSTRACT:
A unity gain buffer for a DAC is provided that is disposed on the output of a switched-capacitor filter and sampled data/continuous time buffer. The unity gain buffer provides low-distortion operation with a high input impedance. Differential input transistors (190) and (200) are provided having the source thereof connected to a common source node (202). A current source transistor (214) provides a current source between node (202) and ground. Each of the drains of transistors (190) and (200) have a constant current source provided thereto by transistors (222) and (230). Cascode devices (216) and (226) are disposed in the drains of transistors (190) and (200) to maintain a constant V.sub.DS during large input common-mode conditions. Any bias variations in transistor (214) are absorbed by feedback transistors (232) and (234), which provide a variable current source to node (202). These are controlled by the voltages on the drains of transistors (190) and (200).

REFERENCES:
patent: 4147943 (1979-04-01), Peterson
patent: 4468628 (1984-08-01), Gross
patent: 4658159 (1987-04-01), Miyamoto
patent: 4868417 (1989-09-01), Jandu
patent: 4901031 (1990-02-01), Kalthoff et al.
patent: 4916338 (1990-04-01), Metz
patent: 4962323 (1990-10-01), Ta

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