Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1991-09-03
1993-05-18
Dzierzynski, Paul M.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330253, 330257, 3072962, H03F 345
Patent
active
052124568
ABSTRACT:
An amplifier has a first stage employing a pair of differentially connected NMOS amplifier transistors, a second stage composed of a bipolar current mirror circuit and two charge pumps. Each charge pump may be a switching voltage multiplier circuit without the conventional output capacitor. The outputs of the two charge pumps are connected, respectively, to the collector of the current-mirror output transistor and to the commonly connected sources of the NMOS amplifier transistors. Each charge pump serves as both a pulse-voltage energizing source and a load to the amplifier. The amplifier is incorporated with a high-current NMOS transistor in an integrated circuit, wherein one differential input of the amplifier is connected to the source of the driver transistor at which an external load, e.g. a motor, may be connected. The output (collector) of the differential amplifier is connected to the gate of the NMOS driver transistor so that the load current through the driver transistor is held regulated to a value proportional to the input or reference voltage that is applied to the other input of the differential amplifier. The peak pulse voltage of each charge pump is greater than the DC supply voltage from which the driver transistor and the two charge pumps are energized so that the dynamic range of both the input control voltage and the amplifier output to the gate of the NMOS driver transistor is much greater than the DC supply voltage to the integrated circuit.
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patent: 5059815 (1991-10-01), Bill et al.
A. B. Grebene, "Bipolar and MOS Analog Integrated Circuit Design", Text Book, 1984, John Wiley & Sons, pp. 514-517.
J. B. Boyd et al., "Low Voltage, Low Cost, High Speed Charge Pump with High/Low Gain Operations," IBM Technical Disclosure Bulletin, vol. 28, No. 2, Jul. 1985, pp. 900-901.
Kovalcik Thomas J.
Latham, II Paul W.
Allegro Microsystems Inc.
Dinh Tan
Dzierzynski Paul M.
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