Hi,

I would like to use ADL5240. (AMP => DSA).

Do you have AMPOUT Maximum output voltage(Vpp) data of ADL5240??

The AMP has 20dB gain.

So, I would like to consider the input voltage(AMPIN) range of ADL5240.

Thanks and best regards,

Jun

Hi,

I would like to use ADL5240. (AMP => DSA).

Do you have AMPOUT Maximum output voltage(Vpp) data of ADL5240??

The AMP has 20dB gain.

So, I would like to consider the input voltage(AMPIN) range of ADL5240.

Thanks and best regards,

Jun

Hi Jun,

I am going to provide a detailed response to cover this question in general not specific to this part, I will provide some comments when necessary for ADL5240.

There is not direct way of finding that out max Vpp, but by using datasheet you can get a value that converges to the real output Vpp. All things considered, you need to measure to find out the exact value, but the calculations will also work amps like ADL5240, that are not PAs.

Check the `Output 1 dB Compression Point ` values of the amplifier. (Psat will be typically 3dB above that for this part).

To find out about the max output voltage capability of the amp, take the P1dB, which will be an output power value in dBm.

Then in order to convert that power to the voltage swing, you can use the tool at the following link.

Utilities:VRMS/dBm/dBu/dBV calculators | Design Center | Analog Devices

Note that typical IO impedance of this part is 50 ohms, so the tool above can be used by that 50 ohms.

But in reality, you can check the s-parameters file to find out the exact impedance value, which will not be 50 ohms, but something close to that.

And note that, those s2p values are generated with small input power, not large. The spar will change when you operate the amplifier at max power. But again, the effect of this change can be negligible for low or medium power amplifiers like ADL5240.

Best,

Kagan

Hi Jun,

I am going to provide a detailed response to cover this question in general not specific to this part, I will provide some comments when necessary for ADL5240.

There is not direct way of finding that out max Vpp, but by using datasheet you can get a value that converges to the real output Vpp. All things considered, you need to measure to find out the exact value, but the calculations will also work amps like ADL5240, that are not PAs.

Check the `Output 1 dB Compression Point ` values of the amplifier. (Psat will be typically 3dB above that for this part).

To find out about the max output voltage capability of the amp, take the P1dB, which will be an output power value in dBm.

Then in order to convert that power to the voltage swing, you can use the tool at the following link.

Utilities:VRMS/dBm/dBu/dBV calculators | Design Center | Analog Devices

Note that typical IO impedance of this part is 50 ohms, so the tool above can be used by that 50 ohms.

But in reality, you can check the s-parameters file to find out the exact impedance value, which will not be 50 ohms, but something close to that.

And note that, those s2p values are generated with small input power, not large. The spar will change when you operate the amplifier at max power. But again, the effect of this change can be negligible for low or medium power amplifiers like ADL5240.

Best,

Kagan