Amplifier power supply rejection ratio or PSRR is typically measured with a network analyzer. In the case of high power amplifier requires high current and most network analyzer output impedance is 50 ohm and cannot drive high current. The TS200 Modulated Power Supply is ideal for amplifier power supply rejection ratio measurements. These amplifiers are include op-
Amplifier PSRR measurement is same as LDO PSRR except for a few minor differences. Please see Figure 1 and refer to the How to Measure LDO PSRR app note, for additional PSRR measurement details.
( a )
( b )
Figure 1. PSRR measurement setup for amplifier. (a) Calibration setup, (b) PSRR setup.
As shown in Figure 1 the amplifier input is grounded, either AC or DC ground, for power supply rejection ratio measurement. Calibrate the setup as shown in Figure 1a with the network analyzer input-
Table 1. List of network analyzers