yes, it's the easiest waychrisccq said:use the resistor network!
jimmyshu said:I agree with jnuhope.
Generally, opamp is biased by current not voltage, to get a constant Gm. So you need to design a current source independent with temperature and power supply.
What do you want to bias by voltage reference? The gate of current source MOS?
firsttimedesigning said:yeah but when i fabricate the chip, the resistance will vary within 20%...a 4k resistor might only have 3.2k resistance. the result wont be very accurate...i need something that can generate a very accurate bias voltage...something that only have error within 0.1%...
firsttimedesigning said:So I am trying generate the bias voltage of an op-amp. So far the only circuit I know that can be used to generate the bias voltage is bandgap reference. But bandgap reference can only generate a voltage that is around 1.4V. I need a bias voltage that is higher than 1.4V...What circuit should I use?
firsttimedesigning said:So I am trying generate the bias voltage of an op-amp. So far the only circuit I know that can be used to generate the bias voltage is bandgap reference. But bandgap reference can only generate a voltage that is around 1.4V. I need a bias voltage that is higher than 1.4V...What circuit should I use?
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