High voltage amplifier circuit and analyzer apparatus

A high voltage amplifier circuit for amplifying a first voltage signal applied to an input terminal and outputting at an output terminal a second voltage signal having a higher voltage than the first voltage signal, said high voltage amplifier circuit comprising:

• a constant current circuit configured to output a constant current signal at said output terminal;
• an operational amplifier configured to output an amplified control signal based on said first voltage signal;
• and
• an amplified voltage output circuit configured to output said second voltage signal based on the constant current signal and on the amplified control signal;
• wherein said constant current circuit comprises:
• a light-emitting device having one end supplied with a constant voltage signal provided by a power supply and another end supplied with ground potential;
• a light responsive electricity generating device configured to output a drive signal in response to light emitted by the light-emitting device;
• a first transistor having a first terminal, a second terminal, and a third terminal and operating, in response to the drive signal supplied to the first terminal, to generate the constant current signal based on the amplified voltage signal applied to the second terminal and to output the constant current signal at the third terminal;
• and
• a current control circuit configured to detect the electrical current value of the constant current signal outputted at the third terminal and control the supply of the drive signal to the first terminal based on the detection.