Help me with choosing topology and designing a 2.4GHz PA

[zechery]

Hi,
I am recently designing a PA using Jazz SBC18PT design kit in ADS.
The topology is to sum the power by Wilkinson power divider and combiner.
But I don't know how to do design the divider and combiner in ADS.
Which component I should use for transmission line during simulation?

Thanks!

 

[vfone]

Re: 2.4GHz PA

www.ece.utah.edu/~cfurse/ece5320/labs/L3/Lab3.doc

 

[khouly]

Re: 2.4GHz PA

in ads there is a smart compnent "passive circuit" to synthize the dividrs te combiners the filter and so on
check it , it is very good

khouly

 

[madengr]

2.4GHz PA

Are you SURE you want to do a distributed Wilkinson in BiCMOS? Where are your ground currents going to flow? How long and lossy will the tline be at your frequency?

 

[zechery]

Re: 2.4GHz PA

Are you SURE you want to do a distributed Wilkinson in BiCMOS? Where are your ground currents going to flow? How long and lossy will the tline be at your frequency?[

Actually, I just started to design this PA, and I am still not sure which topology to use.
Just somebody told me Wilkinson will give a very good performance...>_<

The spec of the PA are
A linear power amplifier to be used in a 2.4GHz high data rate transceiver :
Voltage supply : 1.8V or 3.3V (Jazz LV or HV devices)
Power output : 25dBm
Total power consumption : <4W @ 18dBm CW output power
RF Input signal : 1Vp-p sinusoid for single ended
Input source impedance 50 Ω for single ended
Harmonic distortion : all components < -30 dBc (while running at full rated output power)
Gain flatness (AM - AM distortion): +/- 0.5dB from 0dBm to 26dBm out
Phase flatness (AM - PM distortion): +/- 5 degree from 0dBm to 26dBm out

Can anybody suggests me a topology or reference?
I really don't know how to proceed.
(I want to make sure if I bias the drain point at the right voltage but the transient analysis is really very difficult to converge in ADS for multistage topology)

 

[khouly]

Re: 2.4GHz PA

u can achive this with class AB or class A , and in ads try to simulate the amp with harmonic balanced , it is very efficient in PA simulation

khouly

 

[vfone]

Re: 2.4GHz PA

Use this PA from Anadigics without any other external components:
**broken link removed**

 

[zechery]

Re: 2.4GHz PA

u can achive this with class AB or class A , and in ads try to simulate the amp with harmonic balanced , it is very efficient in PA simulation
khouly

Thanks!
I am trying to achieve this by two stage class AB now.

Added after 1 minutes:

Use this PA from Anadigics without any other external components:
h**p://www.anadigics.com/products/wlan_wimax/wimax_802_16_power_amplifiers/awm6423

Thanks vfone.
But I am doing a course design project.

 

[khouly]

Re: 2.4GHz PA

u can do it , with the driver as class A , and then use class AB , with interstage matching network ,

khouly

 

[melc]

Re: 2.4GHz PA

Use this PA from Anadigics without any other external components:
h**p://www.anadigics.com/products/wlan_wimax/wimax_802_16_power_amplifiers/awm6423

As I remember from our measurements, liniarity is worse than 0.5dB in 2.4-2.7Ghz range... but is still one of the best PA on the market.

 

[zechery]

Re: 2.4GHz PA

2 stage (class A + class AB) only gives my output power around 17dBm.
I added the third stage, and I can boost my gain to 20 dBm, but the harmonic
distortion drops to -26 dBc.

Does anybody have any suggestion?

Thanks!

 

[khouly]

Re: 2.4GHz PA

what about the intersateg matching and optimum power matching at the output ?

khouly

 

[toyotacamry]

2.4GHz PA

what is PA?

 

[khouly]

Re: 2.4GHz PA

PA is a power amplifier

khouly

 

[pewang]

2.4GHz PA

Try to optimize your final stage bias line design to reduce the harmonica.