CMOS buffer amplifier

Details CMOS buffer amplifier CMOS buffer amplifier

1997-11-10

1999-09-07

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, 330260, H03F 345

Patent

active

059492848

ABSTRACT:
A CMOS buffer amplifier can accept input signals and produce output signals that are within one half of the enhancement threshold voltage of the power supply voltages. These characteristics make this buffer amplifier ideal for use with low voltage CMOS circuitry with sub-micron geometries. The buffer amplifier contains two differential amplifiers, the output of both being combined and coupled to an output node. Each differential amplifier has matched input transducing devices on each of its inputs. One of these couples the input of the buffer amplifier to one of the inputs of the differential amplifier, while the other one couples the output of the buffer amplifier as feedback to the other side of the same differential amplifier. The pair of input transducing devices providing input to one differential amplifier are matched and suitable for operation in a higher voltage range than are the matched pair providing input to the other differential amplifier. These two ranges of operation overlap in a voltage region around the center of the overall input range of the buffer amplifier, but collectively they extend the overall range of inputs that the buffer amplifier can accept. Ideally, the buffer amplifier has an overall gain of one and exhibits a substantially linear transfer function. However, if a somewhat less linear transfer function is acceptable, the overall gain of the buffer amplifier can be reduced, thereby extending the range of input signals that can be sensed.

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