Abstract: Provided is an input voltage endurance protection architecture applied to a high-voltage operational amplifier with high input amplitude and high linearity. The input voltage endurance protection architecture includes three parts: a main operational amplifier, an auxiliary operational amplifier and an input stage voltage endurance protection circuit. The main operational amplifier is a high-voltage general-purpose operational amplifier, the auxiliary operational amplifier is a single-stage differential amplifier, and the single-stage differential operational amplifier is connected to a degeneration resistor Rbias. In addition, the auxiliary operational amplifier has a same connection method as the main operational amplifier at a positive input terminal and a negative input terminal, and both the positive input terminal and the negative input terminal are protected by an input stage voltage endurance protection circuit and receive and process input signals simultaneously.
Abstract: Provided is an input voltage endurance protection architecture applied to a high-voltage operational amplifier with high input amplitude and high linearity. The input voltage endurance protection architecture includes three parts: a main operational amplifier, an auxiliary operational amplifier and an input stage voltage endurance protection circuit. The main operational amplifier is a high-voltage general-purpose operational amplifier, the auxiliary operational amplifier is a single-stage differential amplifier, and the single-stage differential operational amplifier is connected to a degeneration resistor Rbias. In addition, the auxiliary operational amplifier has a same connection method as the main operational amplifier at a positive input terminal and a negative input terminal, and both the positive input terminal and the negative input terminal are protected by an input stage voltage endurance protection circuit and receive and process input signals simultaneously.
Abstract: Provided is a logarithmic current-to-voltage conversion circuit having a temperature compensation function. The circuit includes a logarithmic current-to-voltage conversion buffer unit, a positive temperature coefficient compensation unit and a self-heating unit. The logarithmic current-to-voltage conversion buffer unit is provided with a reference circuit consistent with a basic logarithmic circuit. A temperature coefficient is reflected by a difference value ?Vbe between an output of the basic logarithmic circuit and an output of the reference circuit. The positive temperature coefficient compensation unit is provided with a voltage-to-current conversion circuit at a first stage and a current mirror at a second stage and outputs a voltage Vout through an resistor R2. The positive temperature coefficient compensation unit is connected to ?Vbe.
Abstract: Provided is a logarithmic current-to-voltage conversion circuit having a temperature compensation function. The circuit includes a logarithmic current-to-voltage conversion buffer unit, a positive temperature coefficient compensation unit and a self-heating unit. The logarithmic current-to-voltage conversion buffer unit is provided with a reference circuit consistent with a basic logarithmic circuit. A temperature coefficient is reflected by a difference value ?Vbe between an output of the basic logarithmic circuit and an output of the reference circuit. The positive temperature coefficient compensation unit is provided with a voltage-to-current conversion circuit at a first stage and a current mirror at a second stage and outputs a voltage Vout through an resistor R2. The positive temperature coefficient compensation unit is connected to ?Vbe.