ZHCS020J January 2011 – March 2021 OPA2835 , OPA835
PRODUCTION DATA
Figure 9-5 shows a differential amplifier that is used to amplify differential signals. This circuit has high input impedance and is used in differential line driver applications where the signal source is a high-impedance driver (for example, a differential DAC) that must drive a line.
If the user sets VIN± = VCM + VSIG±, then the output of the amplifier may be calculated according to Equation 6.
The signal gain of the circuit is , and VCM passes with unity gain. The amplifier combines two noninverting amplifiers into one differential amplifier that shares the RG resistor, which makes RG effectively ½ its value when calculating the gain. The output signals are in-phase with the input signals.