Pre-amplifier with multi-stage feedback

Details Pre-amplifier with multi-stage feedback Pre-amplifier with multi-stage feedback

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.

Affiliated with

Also associated with

Rating

Pre-amplifier with multi-stage feedback does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pre-amplifier with multi-stage feedback, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pre-amplifier with multi-stage feedback will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-217317