Guest
#3990862
hello please I am looking for a VHDL description, for analogue-to-digital decoder, with analog input, and an output of 8 bits. if someone have information . thanks
What do you need this "converter" for? What is a "analog value"? You know that you cannot synthesize such a description on a FPGA?
Guest
#3991013
hello thank you for your help. Therefore the analog value is a voltage between 40 and 200 mV. I'm not really a profissionnel in the field. I want this converter to find two numerical values for comparison, if not. can I compare two voltage without converting them.
Guest
#3991030
hossam wrote: > hello > thank you for your help. Therefore the analog value is a voltage between > 40 and 200 mV. I'm not really a profissionnel in the field. > I want this converter to find two numerical values for comparison, if > not. can I compare two voltage without converting them. Yes you can, all what you need is an OPAMP with sufficient gain. You can't implement an analog circuit directly with VHDL in a FPGA. Some FPGA come with a low speed ADC (just like the one in many microcontroller) which you can access from VHDL. You can also implement a sigma delta ADC in a FPGA using VHDL, but this also requires an external comparator (OPAMP).
hossam wrote: > can I compare two voltage without converting them. With a comparator you can easily determine, which one of two voltages is higher...