Patent ID: 7209940

Claim:
A temperature compensated function generator circuit, comprising: a first square function generator circuit, wherein the first square generator circuit includes a first non-inverting input, a first inverting input, a first control input, and a first output, wherein the first square function generator is capable of receiving an input signal via the first non-inverting input; a second square function generator circuit, wherein the second square generator circuit includes a second non-inverting input, a second inverting input, a second control input, and a second output; a third square function generator circuit, wherein the third square generator circuit includes a third non-inverting input, a third inverting input, a third control input, and a third output, wherein the first, second, and third inverting inputs are coupled together, wherein the second non-inverting input is coupled to the first inverting input, and wherein the third non-inverting input is coupled to the third inverting input; and an error amplifier circuit, wherein the error amplifier circuit includes: an inverting error amplifier input that is coupled to the third output, a non-inverting error amplifier input that is coupled to the second output, and an error amplifier output that is coupled to the first, second, and third control inputs.