Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1984-05-03
1986-06-03
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330294, 330295, H03F 134
Patent
active
045932522
ABSTRACT:
An amplifier having a very high gain-bandwidth product includes a first operational amplifier having its positive input connected to the amplifier's input. The output of the first operational amplifier is connected to the base of a transistor, the emitter of which is coupled by a gain-setting resistor to ground and is also directly connected to the negative input of the first operational amplifier. The collector of the transistor is connected by a resistive load to a supply voltage and is also directly connected to the negative input of a second operational amplifier. The output of the second operational amplifier is coupled by a capacitor back to its negative input. The output of the second operational amplifier is coupled by a feedback resistor back to the emitter of the transistor. The output of the second operational amplifier is connected to the output terminal of the amplifier. The effective dynamic emitter resistance of the transistor is reduced by the gain of the first operational amplifier causing the transconductance of the amplifier to be proportional to the open or closed loop gain thereof for all practical values of closed loop gain. In a described embodiment of the invention, two such amplifiers stages are coupled to form an instrumentation amplifier.
REFERENCES:
patent: 4349788 (1982-09-01), Sondermeyer
Wurcer et al, "A Programmable Instrumentation Amplifier for 12-Bit Resolution Systems," IEEE Journal of Solid-State Circuits, vol. SC-17, No. 6, Dec. 1982, pp. 1102-1111.
Burr-Brown Corporation
Mullins James B.
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