Magnis SDR - Part 8 Amplifier Driver and Bias
In this video I pull together the amplifier driver and bias circuitry. The amplifier driver centers around a pair of OPA2674 High power wideband opamps - datasheet is here:
https://www.ti.com/lit/ds/symlink/opa...
0:00 Intro
0:37 Driver circuitry schematic walkthrough
1:20 Detail of Op-amp driver and gain
2:20 Bias circuitry on Schematic
3:52 Build and testing order
5:53 Testing the supply to Opamps and to center tap of T4
8:07 OPA2674 Opamps installed and tested
8:55 Output of Opamps on oscilloscope
11:05 Building the bias circuitry
12:12 Q10 p-channel bias switch mosfet installed and tested
13:58 Gate bias circuitry installed
14:58 Gate bias tested
16:12 Confirming on oscilloscope bias is applied to signal from Amp driver