Positive Output Precision Voltage Limiter

This circuit limits its output to a positive- going output only; negative output is clamped to ground. For negative inputs, D1 conducts and R2 provides negative feedback into U1’s summing junction. For positive inputs, D2 conducts and holds the summing junction to 0V. Thus the output across RL can only be positive. This characteristic is handy when driving single-supply amplifiers or unipolar A/D converters. For a negative output simply reverse D1 & D2. As shown, this circuit is a unity- gain inverter but it is also capable of providing voltage gain. Av = – 2 / R1. (Circuit is created by Neil P. Albaugh,  TI – Tucson)

Positive Output Precision Voltage Limiter circuit:

Positive output voltage limeter-blog


Online Simulation of the Positive Output Precision Voltage Limiter Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud  and analyze the circuit yourself, or watch our tutorial video! 

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Michael Koltai