Virtual ground rail splitter
Virtual ground rail splitter with circuit equations and operating-limit checks.
Development preview. Check the assumptions below before relying on a result. Calculations run in your browser.
How it calculates
Setpoint: Vref = Vs Rb/(Rt+Rb)
Load-step approximation: ΔV(t) = −Istep (Riso+Rout)[1−exp(−t/((Riso+Rout)Cload))]
Assumptions
- Buffer is approximated by an ideal reference source and constant closed-loop resistance. Feedback senses before isolation. Response assumes instantaneous buffer action, adequate current limit and stable capacitive-load drive; use OA-18 for a loop model. Ground splitter can only support the entered source/sink current capability.
Worked example
These are the calculator's default inputs. Change any input above to recalculate.
Inputs
- Single supply
- 12 V
- Divider top resistor
- 10000 Ω
- Divider bottom resistor
- 10000 Ω
- Reference bypass capacitance
- 0.00001 F
- Buffer output isolation resistor
- 1 Ω
- Virtual-ground capacitor
- 0.0001 F
- Load-current step
- 0.01 A
- Buffer closed-loop output resistance
- 0.1 Ω
- Buffer source/sink limit
- 0.05 A
- Load-pulse duration
- 0.001 s
Results
- Virtual-ground setpoint
- 6 V
- Pulse-end voltage shift
- -0.0109988 V
- Divider current
- 0.0006 A
- Reference 1% settling
- 0.230259 s
- Steady load shift
- -0.011 V