Field effect transistor current source

A current supply circuit including in combination:

• current supply field effect transistor means having source, drain and gate electrodes;
• negative feedback means coupled between said source and gate electrodes, said negative feedback means including a diffused semiconductor resistor formed integrally with said source electrode of said current supply field effect device, said current supply field effect transistor means having a temperature coefficient, said diffused semiconductor resistor having a predetermined temperature coefficient so that said temperature coefficients of said current supply field effect transistor means and said semiconductor resistor are self-compensating to cause the current through said current supply field effect transistor means to have a magnitude which is substantially independent of temperature variations;
• bipolar diode means having one electrode connected to said drain electrode and another electrode connected to a supply terminal;
• and
• bipolar transistor means having a control electrode and main electrodes, said control electrode being coupled to said drain electrode and to said one electrode of said bipolar diode means at a circuit node, said main electrodes being connected between said source electrode and said supply terminal, said circuit node providing the output current of the current supply circuit.