Patent ID: 6992533

Claim:
A temperature-stabilized oscillator circuit based on cyclic charging and discharging of a charge storage device, comprising: a charge storage device, a controllable upward-integration current source for charging the charge storage device, a controllable downward-integration current source for discharging the charge storage device, a bandgap reference circuit for generating a reference voltage, which is dropped across a first resistor contained in the bandgap reference circuit, a second resistor, across which is dropped a voltage which is proportional to the reference voltage, the two resistors essentially having the same temperature coefficients, a comparator for controlling the upward-integration current source and the downward-integration current source in a manner dependent on the charge state of the charge storage device, a predetermined lower comparator threshold and a predetermined upper comparator threshold, a first circuit branch containing the controllable upward-integration current source or the controllable downward integration current source, and a second circuit branch containing the comparator and/or serving to generate the two comparator thresholds (VCL, VCH), wherein the first circuit branch and/or the second circuit branch comprising, at least occasionally, in each case two mutually superposed partial currents with different temperature dependences, the first circuit branch and the second circuit branch and in particular at least one further circuit branch of the oscillator circuit in each case having, at least occasionally, a sum or a difference of two superposed partial currents with different temperature dependences, the partial currents being able to be set or being set in such a way that linear terms and quadratic terms and in particular higher-order terms of the temperature dependence of the oscillator frequency are essentially minimized, and the partial currents being generated in particular by the bandgap reference circuit.