Published:2011/7/5 8:33:00 Author:Lucas | Keyword: Resistance/voltage transform | From:SeekIC
Al and VD1 constitute constant current source circuit, and Al outputs a constant output voltage, which is the key of resistance/voltage transform circuit, and it can transform -lOV reference voltage into current by reference resistance (R (RP1)+ R1). Since (R (RP1) + R1) resistance is lOkΩ, -lOV reference voltage can get lmA reference current. lmA base current flowing through resistor RX is converted into a corresponding voltage, which is output by buffer amplifier A3, then it will convert resistor RX to the corresponding voltage. In the circuit, the VD3-VD8 and VTl, VT2 constitute a protection circuit.
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