Patent ID: 6982590

Claim:
A bias current generating circuit comprising: a bandgap reference circuit connected to a high power supply voltage terminal for receiving a high power supply voltage and a low power supply voltage terminal for receiving a low power supply voltage, and having a first output terminal for outputting a first voltage which is constant regardless of a temperature, and a second output terminal for outputting a second voltage which changes in accordance with a temperature; a first low-potential-side constant-current source circuit which includes a first resistor connected between said low power supply voltage terminal and a first terminal, and a first current path connected between said first terminal and a first current supply terminal, receives the second voltage as a reference potential, and outputs a first electric current dependent on a temperature and corresponding to said first resistor from said first current supply terminal; a second low-potential-side constant-current source circuit which includes a second resistor connected between said low power supply voltage terminal and a second terminal, and a second current path connected between said second terminal and a second current supply terminal, receives the first voltage as a reference potential, and outputs a second electric current independent of a temperature and corresponding to said second resistor from said second current supply terminal; a third resistor having one end connected to said high power supply voltage terminal; a third low-potential-side constant-current source circuit which is connected between the other end of said third resistor and said low power supply voltage terminal, receives the first voltage as a reference potential, and supplies a temperature-independent third electric current to said third resistor; a high-potential-side constant-current source circuit which includes a fourth resistor connected between said high power supply voltage terminal and a third terminal, and a third current path connected between said third terminal and a third current supply terminal, receives a third voltage at the other end of said third resistor as a reference potential, and outputs a fourth electric current independent of a temperature and corresponding to said fourth resistor from said third current supply terminal; and a current mirror circuit which is connected to said high power supply voltage terminal to receive the high power supply voltage, and generates a bias current in accordance with an electric current supplied from a reference current terminal, wherein said first, second, and third current supply terminals are connected to said reference current terminal.