Circuit for generating a linear current control signal and method thereof
OwnerChao-Ching Cheninventor
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Abstract
A circuit for generating a linear current control signal and method thereof is provided so that the error between the input voltage and the linear current remains constant. The circuit of the invention comprises a resistor, an operational amplifier and a MOSFET, which forms an ideal linear relationship between an input voltage and an output current. The operational amplifier generates a gate-controlled voltage when a reference voltage and an input voltage are inputted thereto. The gate voltage turns on the MOSFET so that a linear current control signal is outputted from the source of the MOSFET.
Claims9
A circuit for generating linear current control signal, which generates a linear output current in response to an input voltage, comprising:
- an impedance component for inputting a reference voltage and outputting a linear voltage;
- an operation amplifier for outputting a gate-controlled voltage in response to the linear voltage and the input voltage;
- and
- a voltage-controlled component for outputting the linear voltage as the linear output current when the gate-controlled voltage is greater than the threshold voltage of the gate-controlled component.
A circuit for generating linear current control signal, which generates a linear output current in response to an input voltage, comprising:
- an operation amplifier having a first voltage input end and a second input end for outputting a gate-controlled voltage in response to the input voltage and a reference voltage;
- a resistor being coupled to the first voltage input for generating a linear current in response to the reference voltage;
- and
- a MOSFET having a drain coupled to the first voltage input end, a gate coupled to the voltage output end, and a source, for outputting the linear current as the linear output current when the gate-controlled voltage is greater than the threshold voltage of the MOSFET.
A method for generating a linear current control signal, comprising:
- inputting a reference voltage and a input voltage;
- outputting a linear voltage in response to the reference voltage;
- outputting a gate-controlled voltage in response to the reference voltage and the input voltage;
- and
- employing the gate-controlled voltage to control the On-Off state of a voltage-controlled component, and outputting the linear voltage as a linear output current when the gate-controlled voltage is greater than the threshold voltage of the voltage-controlled component.
Dependencies are inferred from the claim text.