ADGM1004JCPZ-R2 datasheet(20/32 Pages) AD

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ADGM1004

Data Sheet

Rev. D | Page 20 of 32

TERMINOLOGY

Insertion Loss

Insertion loss is the amount of signal attenuation between the

input and output ports of the switch when the switch is in the

on state. Expressed in decibels, ensure that insertion loss is as

small as possible for maximum power transfer.

An example calculation of insertion loss based on the setup in

Figure 32 is as follows:

Insertion Loss (dB) = −20log10|SRF2RFC|

where SRF2RFC is the transmission coefficient measured from RF2

to RFC with RF2 in the on position. All unused switches are in

the off position and terminated in a purely resistive load of 50 Ω.

Isolation

Isolation is the amount of signal attenuation between the input

and output ports of the switch when the switch is in the off

state. Expressed in decibels, ensure that isolation is as large as

possible.

An example calculation of isolation based on the setup in Figure 33

is as follows:

Isolation (dB) = −20log10|SRFCRF1|

where SRFCRF1 is the transmission coefficient measured from RFC

to RF1 with RF1 in the off position. All unused switches are in

the off position and terminated in a purely resistive load of 50 Ω.

Crosstalk

Crosstalk is a measure of unwanted signals coupled through

from one channel to another because of parasitic capacitance.

An example calculation of crosstalk based on the setup in

Figure 35 is as follows:

Crosstalk (dB) = −20log10|SRF1RF2|

where SRF1RF2 is the transmission coefficient measured from RF1

to RF2 with RF1 in the off position and RF2 in the on position.

All unused switches are in the off position and terminated in a

purely resistive load of 50 Ω.

Return Loss

Return Loss is the magnitude of the reflection coefficient

expressed in decibels, and the amount of reflected signal relative

to the incident signal.

An example calculation of return loss based on the setup in

Figure 32 is as follows:

Return Loss (dB) = −20log10|S11|

where S11 is the reflection coefficient of the port under test.

Third-Order Intermodulation Intercept (IP3)

IP3 is the intersection point of the fundamental POUT vs. PIN

extrapolated line and the third-order intermodulation products

extrapolated line of a two-tone test. IP3 is a figure of merit that

characterizes the switch linearity.

Second-Order Intermodulation Intercept (IP2)

IP2 is the intersection point of the fundamental POUT vs. PIN

extrapolated line and the second-order intermodulation products

extrapolated line of a two-tone test. IP2 is a figure of merit that

characterizes the switch linearity.

Second Distortion Harmonic (HD2)

HD2 is the amplitude of the second distortion harmonic, where, for

a signal whose fundamental frequency is f, the second distortion

harmonic has a frequency of 2 f. This measurement is a single-

tone test expressed with reference to the carrier signal (dBc).

Third Distortion Harmonic (HD3)

HD3 is the amplitude of the third distortion harmonic, where, for a

signal whose fundamental frequency is f, the third distortion

harmonic has a frequency of 3 f. This measurement is a single

tone test expressed with reference to the carrier signal (dBc).

On Switching Time (tON)

tON is the time it takes for the switch to turn on. tON is measured

from 50% of the control signal (INx) to 90% of the on level. No

power was applied through the switch during this test (cold

switched). The switch was terminated into a 50 Ω load.

Off Switching Time (tOFF)

tOFF is the time it takes for the switch to turn off. tOFF is measured

from 50% of the control signal (INx) to 10% of the on level. No

power was applied through the switch during this test (cold

switched). The switch was terminated into a 50 Ω load.

Actuation Frequency

The actuation frequency refers to the speed at which the

ADGM1004 can be switched on and off. The actuation

frequency is dependent on both the settling times and the on

and off switching times.

Power-Up Time

The power-up time is a measure of the time required for the

device to power up and start to pass 90% of an RF input signal

after the VDD pin reaches 95%.

Video Feedthrough

Video feedthrough is a measure of the spurious signals present

at the RFx ports of the switch when the control voltage is switched

from high to low or from low to high without an RF signal present.

Internal Oscillator Frequency

The internal oscillator frequency is the value of the on-board

oscillator that drives the gate control chip of the ADGM1004.

Internal Oscillator Feedthrough

The internal oscillator feedthrough is the amount of internal

oscillator signal that feeds through to the RFx and RFC pins of

the switch. This signal appears as a noise spur on the RFx and

RFC pins of the switch at the frequency the oscillator is

operating at and the harmonics thereof.

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