efelnavarro09
- Jan 18, 2011
- 2
- Joined
- Jan 18, 2011
- Messages
- 2
I started working on a function generator that gives ouput of different waveforms, such as: sine, sine half wave, sine full rectified, square, triangle, saw tooth, biphasic square, etc. with a constant output of 30Vpp. My question is about how dow I need to handle this signal in order to vary its ouput current in a range of 1mA up to 150mA with a variable Rload in a range of 500Ω up to 10KΩ so the output current must stay "constant" within this range. I need to be able of change the output current digitally, maybe using a DAC, Variable gain opamp...
I have been looking and some theory and circuits about Voltage to Current Converter with grounded and floated load, Current Mirror. But I still don't fully understand how do I need to "connect" the constructed signal into the current block prior to connect it to the RLoad. Since all the examples I found in books, google, connect the respective outputs to a fixed source such as V+ instead of a variable one (maybe AC).
So any idea, further information, example is highly appreciated. Thanks in advance.
I have been looking and some theory and circuits about Voltage to Current Converter with grounded and floated load, Current Mirror. But I still don't fully understand how do I need to "connect" the constructed signal into the current block prior to connect it to the RLoad. Since all the examples I found in books, google, connect the respective outputs to a fixed source such as V+ instead of a variable one (maybe AC).
So any idea, further information, example is highly appreciated. Thanks in advance.