The struggle to make the ADF4351 10MHz reference signal.
The ADF4351 PLL needs a full TTL level at 50OHm in the 10MHz reference.
The internal TCXO delivers 5V pk at the ADF reference port.
Then the resulting signal at 1296 / 1152 MHz is a clean small carrier
about 60dB S/N at the SDR RTL stick
Using 400mV tt clean sinus signal from the amplified GPSDO ( 40mV pk)
gave a broad raspy tone at the output port of the ADF
I tried a MMIC demo ampl. with the MAR6 and INA10386
DC to 2GHz broadband amps
got a clean 40mV pk 10MHz at the input of the INA
measuring 5V DC supply , 2V bias at the output pin and 0.2V bias at the input pin
of the INA10386, normal levels.
40mV tt at the input resulting in 0V out..
coupling C 10nF L 10uH
Why this MMIC do not work for 10MHz ?
i do not know yet
maybe my 10MHz driving issue can be solved by a simple opamp
or an other discrete part amplifier like the one below
optimised in Multisim
I have to be sure of the solution before I start to trial and error soldering again
It can not be that difficult to make a 3Vtt 10MHz clock signal???
INA 10386 Agilent /HP DC-1.8GHz claimed 26dB gain
I had 0 output with 40mVtt 10MHz in but after lowering the original 56Ω to 18Ω
the device I 5mA up to 38mA then the device starts to amplify