Datasheet GS8551, GS8552, GS8554 (Gainsil) - 8

GS8551/8552/8554 Typical Application Circuits Differential amplifier The differential amplifier allows the subtraction of two input voltages or cancellation of a signal common the two inputs. It is useful as a computational amplifier in making a differential to single-end conversion or in rejecting a common mode signal. Figure 4. shown the differential amplifier using GS855X. Figure 4. Differential Amplifier 1 R 2 R 4 R + 2 V =( ) R V V − +( 1 R 2 R + ) 3 R OUT IN IP R R R R R R R REF V 3 4 1 + 1 3 4 1 + If the resistor ratios are equal (i.e. R1=R3 and R2=R4), then R 2 V = (V −V ) + OUT IP IN R REF V 1 Low Pass Active Filter The low pass active filter is shown in Figure 5. The DC gain is defined by –R2/R1. The filter has a -20dB/decade roll-off after its corner frequency ƒC=1/(2πR3C1). Figure 5. Low Pass Active Filter March 2020-REV_V2 8/14