Negative Resistance Amplifier
Original Publication Date: 1988-Mar-01
Included in the Prior Art Database: 2005-Feb-14
This article describes an amplifier configuration which generates a negative output resistance that is proportional to a reference resistance. This configuration can accurately compensate for line loss in power supplies, and simplify current mirror and differential measurement designs. The amplifier A shown in Fig. 1 combines both positive and negative feedback to generate a negative output resistance (RO). The ratio (K) of RO and the sense resistor (RS) and the negative (R1, R2) and positive (R3, R4) feedback paths are governed by the following relationships: (Image Omitted) G/(K + 1) = R2/R1 (G + 1)/K = R4/R3 Where G is the inverting gain (E0/(E1-E2)) of the amplifier, the non-inverting gain is equal to G+1. If the amplifier is employed as a unity gain follower as shown in Fig.