SBOS932C January 2020 – March 2021 THP210
The THP210 offers considerable flexibility in the configuration and selection of resistor values. Low input bias current and bias current noise allows for larger gain resistor values with minimal impact to noise or offset, see Section 9.1.3 for more details.
The design starts with the selection of the feedback resistor value. The 2-kΩ feedback resistor value used for the characterization curves is a good compromise among power, noise, and phase margin considerations. With the feedback resistor values selected (and set equal on each side), the input resistors are set to obtain the desired gain, with input impedance also set with these input resistors. Differential I/O designs provide an input impedance that is the sum of the two input resistors. Single-ended input to differential output designs present a more complicated input impedance. Most characteristic curves implement the single-ended to differential design as the more challenging requirement over differential-to-differential I/O designs.