SwingeyP
Member
Hello.
I am very new to RF design and could do with some help & advice. I am using an AD831 mixer as shown in the attached circuit.
The video shows the circuit on my development board and what I think is the two mixed signals. This is without any voltage connected to the device 9v?
When I connect a 9v battery the chip starts to get hot. I have checked and double checked the circuit. It's basically what is described on the datasheet. Why should the chip be getting hot. Also the voltage drops from 9v to 8.6v when connected.
It appears that the mixer IS doing something. When I adjust the signal generator you can see the waveform change.
Is this the kind of trace I should expect to see?
Why is the chip getting hot?
Scope settings
Sweep .2 us
Volts/Div 10mv
LO = (from DDS) 4Mhz @ 20mv
RF IN (from signal generator) 7Mhz @ 10mv
I hope this makes sense your help is MUCH appreciated.
Cheers - Paul (M0TVU)
I am very new to RF design and could do with some help & advice. I am using an AD831 mixer as shown in the attached circuit.
The video shows the circuit on my development board and what I think is the two mixed signals. This is without any voltage connected to the device 9v?
When I connect a 9v battery the chip starts to get hot. I have checked and double checked the circuit. It's basically what is described on the datasheet. Why should the chip be getting hot. Also the voltage drops from 9v to 8.6v when connected.
It appears that the mixer IS doing something. When I adjust the signal generator you can see the waveform change.
Is this the kind of trace I should expect to see?
Why is the chip getting hot?
Scope settings
Sweep .2 us
Volts/Div 10mv
LO = (from DDS) 4Mhz @ 20mv
RF IN (from signal generator) 7Mhz @ 10mv
I hope this makes sense your help is MUCH appreciated.
Cheers - Paul (M0TVU)