6.7 Off Isolation

Off isolation is defined as the ratio of the signal at the drain pin (D) of the device when a signal is applied to

the source pin (Sx) of an off-channel. Figure 6-7 shows the setup used to measure, and the equation used to

calculate off isolation.

GND

NETWORK

ANALYZER

VOUT

S

D

50Q

VSIG

RL

50Q

SX

RL

50Q

VS

VDD

0.1µF

Figure 6-7. Off Isolation Measurement Setup

OUT

S

V

Off Isolation

20 Log

V

§

·

˜

¨

¸

©

¹

(1)

6.8 Crosstalk

Crosstalk is defined as the ratio of the signal at the drain pin (D) of a different channel, when a signal is applied

at the source pin (Sx) of an on-channel. Figure 6-8 shows the setup used to measure, and the equation used to

calculate crosstalk.

NETWORK

ANALYZER

GND

S1

S2

VSIG

50Q

VOUT

RL

50Q

RL

D

50Q

VS

VDD

0.1µF

Figure 6-8. Crosstalk Measurement Setup

OUT

S

V

Channel-to-Channel Crosstalk

20 Log

V

§

·

˜

¨

¸

©

¹

(2)

TMUX1119

SCDS401C – DECEMBER 2018 – REVISED FEBRUARY 2024

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