Amplifiers – With semiconductor amplifying device – Including signal feedback means
Patent
1994-03-22
1994-12-06
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including signal feedback means
330 99, 330100, 330107, H03F 134
Patent
active
053714792
ABSTRACT:
A circuit for amplifying an input signal comprises an operational amplifi a dual operational amplifier, and a buffering operational amplifier all cascaded in the aforementioned order. The first operational amplifier amplifies the input signal with minimum noise degradation, is set up as a non-inverting amplifier stage, and has a local negative feedback loop comprising a resistor and capacitor in parallel. The dual operational amplifier has two amplifying devices. One device forms a second amplifying stage which increases the gain of the pre-amplified input signal and has a local negative feedback loop comprising a resistor. The other device is a third operational amplifier which combines with the buffering operational amplifier to form an amplifying and buffering stage. The third operational amplifier connects in series to the output of the second amplifying stage. The buffering operational amplifier connects in series to the output of the third operational amplifier and buffers the amplified signal at this output. The amplifying and buffering stage has a two-stage feedback loop comprising a resistor connected between the output of the buffering operational amplifier and the inverting input of the third operational amplifier. A four-stage feedback loop includes a resistor and capacitor in parallel and connects between the output of the buffering operational amplifier and the inverting input of the first operational amplifier.
REFERENCES:
patent: 3512102 (1970-05-01), Kubach
patent: 3863173 (1975-01-01), Scheib et al.
patent: 4074204 (1978-02-01), Broburg et al.
Lall Prithvi C.
McGowan Michael J.
Mullins James B.
Oglo Michael F.
The United States of America as represented by the Secretary of
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