| Electronics > Projects, Designs, and Technical Stuff |
| Controllable gain power amplifier |
| (1/3) > >> |
| promach:
What is ng ? What are the purposes of Ctrl0, Ctrl1, Ctrl2 and Ctrl3 ? |
| awallin:
a simple view might be that the upper FETs work as "variable drain-resistors" for the lower FETs? |
| magic:
ng is obviously W divided by 9ยต. Seriously, no idea :-DD I think the upper FETs and Ctrl inputs are used to cascode the lower FETs or to disable them (by strapping Ctrl to ground) and thus reduce gain. |
| promach:
What about L_stage1 and Bias2 ? Should I just connect these two to Vdd ? |
| Miti:
L means inductor to me. Most likely you need to connect an inductor series with a bias resistor to set the correct bias voltage on both L_stage1 and RFout. Bias2 sets the bias voltage (thus the current) for the final stage. |
| Navigation |
| Message Index |
| Next page |