Converting circuit for converting input voltage into output current

摘要

A converting circuit for receiving an input voltage and generating an output current, including: a transistor, coupled to a supply voltage at a drain of the transistor, and a source of the transistor is coupled to a first voltage, and a gate of the transistor is coupled to the input voltage and a fixed voltage; and a resistor, coupled to the input voltage and the gate of the transistor, and the output current flows through the resistor, wherein the output current is related to the fixed voltage, the input voltage and the resistor.

主权项

1. A converting circuit for converting an input voltage into an output current, comprising:
a transistor, coupled to a supply voltage at a drain of the transistor, and a source of the transistor is coupled to a first voltage; a resistor, coupled to the source of the transistor, receiving the input voltage, wherein the output current flows through the resistor; and an amplifier, having a first input terminal for receiving a fixed voltage, a second input terminal coupled to the source of the transistor, and an output terminal coupled to a gate of the transistor, wherein the output current is related to the fixed voltage, the input voltage and the resistor, and the fixed voltage has a predetermined fixed voltage level independent of the input voltage, wherein the drain of the transistor is coupled to the supply voltage via a differential voltage unit, and wherein the converting circuit and the differential voltage unit mixing an input voltage of the differential voltage unit and the input voltage and generating the output current.