Hi Paul,
Quick correction on my simulations, but it does not change our recommendations on increasing Riso.
I placed the bias point in the incorrect location so the phase margin calculation was off. I put the corrected simulations below. But please note…
Other Parts Discussed in Thread: TLV3691 , TLV3491 , OPA349 I need to know how the following devices OPA349 (nanowatt opamp), TLV3491/TLV3691(nanowatt comparators) behave when their DC power raises very slowly, 45 seconds or more from 0 to 3V...
I intend…
Other Parts Discussed in Thread: OPA349 I have ac simulation of OPA349 in inverting configuration that has large feedback resistor (<10K). With very large gains, the simulation shows a drastic drop in low freq gain (> 1M no gain at all). Does anyone…
Carlos,
You do not specify what other parameters besides IQ and bandwidth are critical in your customer's application but here are some other options:
OPA369 (800nA, 12kHz) , OPA349 (1uA, 70kHz) and OPA379 (2.9uA, 90kHz).
Thank for your repply.
Today I used OPA349 instead. And the wave shape in scope like this:
channel 1 : power supply which is 6V DC
channel2 : output voltage which have been intergrated
Hi Eric,
Thanks for the information. I would like a voltage reference that consumes a few uA. I could go with an op amp such as the OPA349 in unity gain with a resistor divider on the input but for the divider to consume minimal current the resistors…
Part Number: INA149 Other Parts Discussed in Thread: THS4061 Tool/software: In one of my board i have a OPAMP.
I am unable to identify exact part no.
On IC TI49 ABT is mentioned..
David,
I did a quick simulation and found that the output impedance of the OPA349 is approximately 100 ohms at 150 Hz and rises linearly with frequency. This is not quite as high as I thought and may not be an issue. You are correct that open loop gain…
