433MHz amplifier freq range clarificiaon SKYWORKS

[disisku_22]

433m class c amp

Dear all,

i am planing to use SKY65111 device for wide band amplifier application in ISM band(433, 868 and 915MHz freq band).
But as per the data sheet it say's freq range optimized 600 - 1100MHz.

I need clarification for the following points.

1. as per the gain Vs freq plot Gain is around 31dB @ 433Mhz and referring to S-parameter S11 is -16dB, so can i use this device at 433MHz by tuning the i/p and o/p matching elements.
2. By referring to S- parameter file and tuning the i/p and o/p matching components is it possible to get good i/p and o/p reflection loss.

Since.. i want to use single chip for multiple freq band.


thanks
Roshni

 

[FvM]

range 433 mhz

According to the gain curve, it has a kind of notch around 433 MHz and shouldn't be used for this application.

 

[biff44]

I am pretty happy with the SKY65116 at 433 MHz. Try that one.

Rich

 

[kspalla]

This notch can be avoided by matching the amp for this range.
So try this.

 

[disisku_22]

Dear all...

Tanks for the reply...

Biff4.. what is the power o/p and vswr you got for this device at 433MHz...

is it possible to share the matching comp value(it will help in reducing my design
time).

thanks and regards
Roshni

 

[kspalla]

The attached pdf "SKY65111.pdf" is not working.
If the device is having cascaded stages then you will end in less tweaking capability.

 

[disisku_22]

Dear kspalla,


sorry... attached sky65111 file is S- parameter, pls find the below link to down load the data sheet.

**broken link removed**

thanks
roshni

 

[vfone]

The notch at 430MHz is coming from interstage matching network and cannot be removed externally. Was done by Skyworks to avoid some potential instability due to high out-of-band gain.

 

[biff44]

I was getting over 1.5 watts out after the lowpass filter, so It must have been putting out close to 2 watts. Very narrowband operation at 433 MHz running off of a lithium 3.6 V battery (short bursts).

The SKY65116 is already matched to 50 ohms--no matching components required.

It operates almost like a class C amp in that it only draws 300 mA until an RF signal is put onto the input, then the current shoots way up.

Rich

 

[disisku_22]

Dear all

any device will u suggest for my application:
freq range: 300 - 1GHz
p1dB : 33dBm
Gain : 20dB
voltage : 3.3volts
with PA enable pin option
Thanks
Roshni