Pico ammeter

Posted on Apr 12, 2012

Care must be taken to eliminate any stray currents from flowing into the current summing node. This can be accomplished by forcing all points surrounding the input to the same potential as the input. In this case the potential of the input is at virtual ground, or OV. Therefore, the case of the device is grounded to intercept any stray leakage currents that may otherwise exist between the ±15 V input terminals and the inverting input summing junctions. Feedback capacitance should be kept to a minimum in order to maximize the response time of the circuit to step function input currents.

Pico ammeter
Click here to download the full size of the above Circuit.

The time constant of the circuit is approximately the produce of the feedback capacitance C^ times the feedback resistor R^. For instance, the time constant of the circuit is I sec if C^, = lpF. Thus, it takes approximately 5 sec (5 time constants) for the circuit to stabilize to within 1% of its final output voltage after a step function of input current has been applied. of less than 0.2 to 0.3 pF can be achieved with proper circuit layout.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Ultra-Flanger guitar effect
    Quiz Circuit
    Circuit Compact DJ Station
    Battery-Charging Indicator For Mains Adaptor
    PWM Speed Control Circuit Using Forward-Reverse and Regenerative Braking
    siren alarm circuit diagram usng lm358
    Stroboscope Uses White LEDs
    Muscular Bio-Stimulator
    Complete HeNe Laser Power Supply Schematics
    Interpolating Scanner Circuit
    High Voltage Electrolytic Capacitor Reformer
    Brush 6 channel camera power supply circuit MAX1566-1567
    Micro Wireless Monitor FM FM transmitter circuit