FUNCTION GENERATOR AND OSCILLATION CIRCUIT WITH TEMPERATURE COMPENSATION

摘要

PURPOSE: To allow a generating circuit generating a signal proportional to a cubic or higher degree function in the function generator and the oscillation circuit with temperature compensation to generate a voltage changing with respect to a temperature in a way of the higher degree function thereby attaining desired temperature correction. CONSTITUTION: The function generator generating signals Sα, Sx proportional to a higher degree function f(x) represented by a polynomial f(x)=A (x-α) ...+β(x-α)+γ=Ax +-Bx ...+Cx+D is provided with a variable generating section 11 that generates a main variable signal Sαproportional to a main variableαand an unknown signal Sx proportional to an unknown number (x) based on a voltage VA proportional to an absolute temperature and a voltage VX deciding a center point of the main variableα. The oscillation circuit is provided with a temperature compensation function generating circuit 35 generating a voltage proportional to a cubic function f(x) and a crystal oscillation circuit 36 generating a signal of a desired frequency based on the voltage proportional to the cubic function f(x), and the circuit 35 is made up of a cubic function generator.