Well Kenneth
The equivalent input current noise for a transimpedance design is a lot more than just the current noise term - often the output noise is dominated by the input voltage noise getting a peaking gain to the output.
Transimpedance design…
You are of course kidding me Paul,
Your example circuits are transimpedance designs where the source C is a big part of the response equations.
And actually, if I had to guess I would bet they are under 10pF and what I would probably due (lacking…
Part Number: UC2842 Other Parts Discussed in Thread: UC2706 Dear team,
I am designing a push-Pull converter using UC2842 and UC2706 with reference to U-101 200KHz Current-Mode Converter provides 500W.
Can I get the simulation model for the power supply…
Ramgopal,
Your assessment of the bulk decoupling required is correct. You must calculate the required amount and validate it. The Hardware Design Guide (SPRABI2) discusses this calculation.
This bulk capacitance will affect the control loop on the…
Well Selvedin,
The numerator is just the ideal gain from a current input to the output via Rf||Cf = Zf
The denominator is the 1+(1/LG) term where the key part is the diode source C getting into the noise gain,
This file is a later summary of all…
Other Parts Discussed in Thread: BQ40Z60 , BQ27532-G1 , BQ27531-G1 , BQ27530-G1 Dear BCP team,
I'm looking for an equivalent solution to maxim part# MAX77818 (see attached DS). As far as I know we do not offer a battery charger with gas gauge function…
We have to rely on these somewhat simplified equations to get started - and yes, a full simulation of LG phase margin is prudent. the op amp open loop output impedance rarely gets into this unless the load is reactive.
Not sure why all these later Zt…
Part Number: OPA657 Hello
I've got a related question....to the connecting thread. I need to design a transimpedance amplifier with OPA657 (any better opamp from TI - with lower input bias current, please suggest, there is something better for the application…
Morning Sonja,
Your capacitance you need for the transimpedance design is just the photodiode + layout+ Ccm +Cdiff on the OPA858,
Your feedback capacitor is what you solve to get a particular Q in the closed loop response and is not part of your input…
