Discrete step variable gain inverting amplifier with constant ra

Details Discrete step variable gain inverting amplifier with constant ra Discrete step variable gain inverting amplifier with constant ra

1998-03-31

1999-10-26

Shingleton, Michael B

Amplifiers

With semiconductor amplifying device

Including gain control means

330284, 330278, H03G 312

Patent

active

059735660

ABSTRACT:
An inverting amplifier having variable gain in M discrete steps that are a fixed ratio F apart may be constructed by grounding the non-inverting input of a high gain differential gain element, and connecting the inverting input through a single-pole M-throw switch to the N.sup.th terminal in a ladder network of M cascaded elements. Each element is a series R and X, with X grounded, and their junction being where the next element of the ladder is connected. These junctions are also the aforementioned terminals of the ladder network, and are what are coupled to the M throws of the switch. At an input end of the ladder network is another impedance Z, to which the input V.sub.in is applied. At the other end of the ladder network is a final R in series with another Z that is driven by the V.sub.out obtained from the output of the gain element. Once Z and F are selected R and X may be found according to the relationships R=Z[.sqroot.(1/F)-1]and X=Z[.sqroot.(1/F)]/[.sqroot.(1/F)-1]. FET's may used to provide a make before break switch. The setting of the switch picks N, which determines the variable gain.

REFERENCES:
patent: 4132957 (1979-01-01), Hekimian et al.
patent: 4500845 (1985-02-01), Ehni
patent: 5721513 (1998-02-01), Yuasa

Affiliated with

Also associated with

Rating

Discrete step variable gain inverting amplifier with constant ra does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Discrete step variable gain inverting amplifier with constant ra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discrete step variable gain inverting amplifier with constant ra will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-769149