Temperature compensating circuit, temperature compensating logarithm conversion circuit and light receiver

An optical signal receiver comprising:

• a photo detector which converts optical signals into electric signals;
• a preamplifier which amplifies said electric signals;
• and
• a logarithm converter;
• wherein said logarithm converter includes a temperature compensating circuit,
• wherein said temperature compensating circuit includes a first circuit network between an inverting input terminal of an operational amplifier and an output terminal of said operational amplifier, and a second circuit network between the inverting input terminal of said operational amplifier and a reference potential, and
• wherein at least one of said first circuit network and said second circuit network is comprised of an arrangement containing a plurality of series-connected thermistor/resistor pairs in which the thermistors are connected parallel to the resistors and said temperature-compensating circuit compensates a temperature-dependent signal which is inputted into a positive phase input terminal of said operational amplifier, and outputs the temperature-compensated signal.