7.11 Off Isolation

Off isolation is defined as the ratio of the signal at the drain pin (Dx) of the device when a signal is applied to the source pin (Sx) of an off-channel. The characteristic impedance, Z₀, for the measurement is 50 Ω. Figure 37 shows the setup used to measure off isolation. Use off isolation equation to compute off isolation.

Figure 37. Off Isolation Measurement Setup

Equation 1.