LMX2572LP: LMX2572LP

Roy Flax

Part Number: LMX2572LP

Tool/software:

Thank you for your previous answer. I have some more:

1. Regarding your previous answer, do you think that combined the signals from both ports using short wires (A+ to B+, A- to B-) allows me to cheaply get extra 3dB power? (assuming I will find a way to properly route these nets). I think that this what you originally meant in your answer but I was not sure...

2. Do figures 17, 18, 155, 156 refer to a single ended output power or to a differential one?

3. According to RF OUTPUT specification, a single ended output power at 2GHz with OUTxPWR=15 is 5dBm.
According to to figure 18 (156) it seems that for 2GHz, with OUTx_PWR=15, the output power is 6dBm. Is it a typo in the datasheet?

Thanks,

Roy

over 1 year ago

0 Noel Fung over 1 year ago

TI__Guru** 122030 points

Hi Roy,

I just tried connecting two same polarity pins together, I didn't get 3dB more power.

All power measurement is single-ended.

5dBm is a typical number, it is not surprise to see 1 or more dB variation.

If you are looking for 10dBm power, I think a gain block is the most straight forward solution. TI has several low cost gain blocks.

https://www.ti.com/rf-microwave/rf-amplifiers/rf-gain-block/products.html#-1=trf37%3Bfalse&

0 Roy Flax over 1 year ago in reply to Noel Fung

Prodigy 50 points

How much power gain did you get when you combined both differential outputs? (I can use a single differential-port output power to drive a mixer's LO. Any small increase will improve the mixer behavior, so this is why I don't look for active power amplifier)
Thanks,
Roy

+1 Noel Fung over 1 year ago in reply to Roy Flax

TI__Guru** 122030 points

Hi Roy,

When individual output is 2.1dBm, the "combined" output is just 3.5dBm.

Clock & timing

Clock & timing forum

LMX2572LP: LMX2572LP