CMRR = 20log(Gain*Vin/Vout) (CMRR number is positive in dB)
( a )
( b )
Figure 1. CMRR measurement setup for amplifier. (a) Calibration setup, (b) CMRR setup.
Typically CMRR measurement is done by using a network analyzer (see table 1). Using the setup in Figure 1, the network analyzer Source output is applied to the TS200 Modulated Power Supply input. The TS200 output is connected to the amplifier’s common-
First the network analyzer and the TS200 need to be calibrated. Figure 1a shows the calibration setup. The network analyzer input-
After calibration, amplifier CMRR measurement setup is shown Figure 1b. The network analyzer input-
Table 1. List of network analyzers