Current supplying circuit as for an oscillator

Claim 1

A current supplying circuit comprising: a load having a terminal to which first and second load currents are to be supplied; resistance means, having first and second terminals, through which currents that determine said first and second load currents flow; means for providing first and second control potentials, wherein said second control potential is substantially different in magnitude than said first control potential, said means for providing including: a plurality of serially connected semiconductor junctions, and means for applying current to said junctions for biasing said junctions to develop said first and second control potentials across first and second combinations of said junctions respectively; first and second transistors of like conductivity type, having respective common electrodes coupled to the first terminal of said resistance means, having respective input and output electrodes, and having, respectively, first and second input circuits between said input electrodes and the second terminal of said resistance means, wherein said first input circuit includes a third transistor of complementary conductivity type to said first transistor, said third transistor having an input electrode coupled to said first control potential, a common electrode connected to the input electrode of said first transistor and an output electrode coupled to the second terminal of said resistance means and to a point of operating potential, and wherein said second input circuit includes a fourth transistor of complementary conductivity type to said second transistor, said fourth transistor having an input electrode coupled to said second control potential, a common electrode connected to the input electrode of said second transistor and an output electrode coupled to the second terminal of said resistance means and to said point of operating potential; control means for applying a reference potential to the input electrode of said second transistor during a first time interval, rendering said second transistor non-conductive while allowing said first control potential to be applied to the first terminal of said resistance means through said first input circuit and said first transistor to develop said current that determines said first load current in said first transistor and said resistance means during said first time interval, and for applying said reference potential to the input electrode of said first transistor during a second time interval, rendering said first transistor non-conductive while allowing said second control potential to be applied to the first terminal of said resistance means through said second transistor to develop said current that determines said second load current in said second transistor and said resistance means during said second time interval; means coupled to said output electrodes of said first and second transistors for receiving substantially said currents that determine said first and second load currents, and coupled to said load terminal for supplying said first and second load currents thereto.