### Half-wave precision rectifiers circuit

A half-wave rectifier is a circuit that passes only the positive or only the negative

Portion of a wave ,while blocking out the other portion

Rectifiers are impremented using diodes. The

**nonzero forward-voltage drop**of

A pactical diode may cause intolerable errors in

**low-level signal**

Proceeding of half-wave precision rectifiers circuit we separate are two case

**Case 1**Vi > 0 negative input of

**op amp**is higher positive input ,the op amp

Output = 0 ,I1 will flow through R1 and D1 ,hence Vo = 0

**Case 2**Vi <>

Output = 1 ,I2 will flow through R2,R1 and D2 ,but the voltage at positive input

Must equal the voltage at negative input ,hence I2 = (0-Vi)/R1 = (Vo-0)/R2

This gives Vo = (-R2/R2)Vi

**Circuit behavior**

Vo = 0 for Vi > 0

Vo = -(R2/R1)Vi for Vi <>

**Example waveform**

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