Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-07-09
1999-12-21
Lee, Benny
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
060054395
ABSTRACT:
A unity gain analog signal amplifier for low voltage applications, with no DC level shifting so as to preserve dynamic range, a large bandwidth, a good driving capability for capacitive loads and a rail-to-rail output voltage range. A differential amplifier composed of matched MOSFETs is biased between current source and sink circuits. The current source is a current mirror which provides equal currents through the two branches of the differential amplifier, while the tail current is sunk by the current sink circuit. The analog input signal drives the gate terminal of one of the MOSFETs and the gate and drain terminals of the other MOSFET are connected together and provide the output signal. An additional current mirror branch driven by the current source and connected to the output terminal provides increased output current driving capacity and output voltage pull up. With two such circuits connected in a symmetrical push-pull configuration, output current sourcing and sinking as well as output voltage pull up and pull down capabilities are realized.
REFERENCES:
patent: 4797629 (1989-01-01), Widlar
patent: 5530399 (1996-06-01), Chambers et al.
patent: 5666086 (1997-09-01), Klein
Choe Henry
Lee Benny
National Semiconductor Corporation
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