Abstract: A voltage generating circuit includes a range adjusting unit configured to output a code signal for adjusting the range of an output voltage and to determine a magnitude of the output voltage to set a control code while an output range adjusting operation is performed. The range adjusting unit is configured to output the code signal in response to a data code received from the outside after the output range adjusting operation is complete. The voltage generating circuit includes a digital analog converter configured to output a conversion voltage in response to the code signal, and an output unit configured to set an amplification gain thereof according to the control code and to amplify the conversion voltage according to the amplification gain to output the output voltage.

Abstract: An apparatus for converging voltages of an optical recording medium may include a first converging unit, a second converging unit, and/or a switching unit. The first converging unit may be configured to converge a voltage level of a first input signal to a reference voltage. The second converging unit may be configured to converge a voltage level of a second input signal to the reference voltage. The switching unit may be configured to determine whether to short-circuit output terminals of the first and second converging units during a period when the voltage levels of the first and second input signals are being converged to the reference voltage.

Abstract: A non-inverting amplifier includes an operational amplifier, an input resistor, and a feedback resistor. The operational amplifier amplifies and outputs a difference between an input voltage and a voltage of a control node. The input resistor is connected between a reference voltage port and the control node. The feedback resistor is connected to an output port of the operational amplifier and the control node. The non-inverting amplifier supplies a control current to the control node for controlling an offset voltage of the output port.

Abstract: A voltage generating circuit includes a range adjusting unit configured to output a code signal for adjusting the range of an output voltage and to determine a magnitude of the output voltage to set a control code while an output range adjusting operation is performed. The range adjusting unit is configured to output the code signal in response to a data code received from the outside after the output range adjusting operation is complete. The voltage generating circuit includes a digital analog converter configured to output a conversion voltage in response to the code signal, and an output unit configured to set an amplification gain thereof according to the control code and to amplify the conversion voltage according to the amplification gain to output the output voltage.

Abstract: A non-inverting amplifier includes an operational amplifier, an input resistor, and a feedback resistor. The operational amplifier amplifies and outputs a difference between an input voltage and a voltage of a control node. The input resistor is connected between a reference voltage port and the control node. The feedback resistor is connected to an output port of the operational amplifier and the control node. The non-inverting amplifier supplies a control current to the control node for controlling an offset voltage of the output port.

Abstract: An apparatus for converging voltages of an optical recording medium may include a first converging unit, a second converging unit, and/or a switching unit. The first converging unit may be configured to converge a voltage level of a first input signal to a reference voltage. The second converging unit may be configured to converge a voltage level of a second input signal to the reference voltage. The switching unit may be configured to determine whether to short-circuit output terminals of the first and second converging units during a period when the voltage levels of the first and second input signals are being converged to the reference voltage.