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Improved Howland Current Pump Stability. Tim Green Senior Analog Applications Engineers Precision Analog Linear Applications July 19, 2013. Improved Howland Current Pump IL Accuracy Circuit. RT allows for trim to optimum Z OUT and improved DC Accuracy. Ideal Op Amp.

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improved howland current pump stability
Improved Howland Current Pump Stability

Tim Green

Senior Analog Applications Engineers

Precision Analog Linear Applications

July 19, 2013

improved howland current pump il accuracy circuit
Improved Howland Current PumpIL Accuracy Circuit

RT allows for trim to optimum ZOUT and improved DC Accuracy

Ideal Op Amp

improved howland current pump v i dc accuracy calculations
Improved Howland Current PumpV-I DC Accuracy Calculations

1% Resistors (w/RT=0) could yield only 9% Accuracy at T=25°C

Still useful for V-I control in Motors/Valves  V-Torque Control

Outer position feedback adjusts V for final position

improved howland ac analysis
Improved Howland AC Analysis

RI

RF

Op Amp sees differential [(-IN) – (+IN)] feedback

b=b- -b+ (Must be positive number else oscillation!)

improved howland 1 b calculation no load full load
Improved Howland 1/b CalculationNo Load & Full Load

Change in RO from No Load to Full Load

has no significant impact on the 1/b Plot

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