Multiple amplifier interconnection for optimal sensitivity
First Claim
1. A low noise circuit for providing amplified electrical signals comprisinga source of electrical signals including a predetermined source resistance Rgcharacterized in thata plurality of N like amplifiers are connected together, each amplifier includes a predetermined rms noise voltage ER and a predetermined rms noise current IR ;
- andthe plurality of N like amplifiers are connected in series, where N is substantially equal to the quantity (IR Rg)/ER, for Rg greater than ER /IR.
1 Assignment
0 Petitions
Accused Products
Abstract
To obtain optimal operational sensitivity from an amplifier connected to a source of electrical signals, a technique utilizes multiple amplifiers connected together. The technique determines the number, N, of amplifiers (31 or 51) to be used and whether they should be connected in parallel (FIG. 3) or series (FIG. 5) in order to optimize the sensitivity of a given type of amplifier. Accordingly, multiple interconnection of amplifiers may be used in lieu of noise matching with transformers to minimize the excess-noise figure of the multiple amplifier circuit. The technique capitalizes on the advances in integrated circuit amplifier design, such as compactness and wideband performance, while providing lower loss and higher reliability through redundancy.
-
Citations
4 Claims
-
1. A low noise circuit for providing amplified electrical signals comprising
a source of electrical signals including a predetermined source resistance Rg characterized in that a plurality of N like amplifiers are connected together, each amplifier includes a predetermined rms noise voltage ER and a predetermined rms noise current IR ; - and
the plurality of N like amplifiers are connected in series, where N is substantially equal to the quantity (IR Rg)/ER, for Rg greater than ER /IR. - View Dependent Claims (2)
- and
-
3. A low noise source for providing amplified electrical signals produced by a source of electrical signals including a predetermined source resistance Rg, the low noise circuit comprising:
a plurality of N-like amplifiers, each amplifier including a predetermined rms noise voltage ER and a predetermined rms noise current IR wherein the plurality of N-like amplifiers have their inputs serially connected together when the value of Rg is greater than ER /IR and the value of N is approximately equal to the quantity of (IR Rg)/ER. - View Dependent Claims (4)
Specification