MOS Control circuit for integrated circuits
AssigneeEurosil GmbH
InventorsErnst Lingstaedt, Gerhard Moegen, Gottfried Wotruba
Life of this patent
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Abstract
A circuit arrangement includes a MOS field effect transistor as a variable resistance in series with a load such as an integrated circuit across a power supply with means for controlling the variable resistance to establish a very constant supply or input voltage to the load. A switch may be included to apply a constant supply or input voltage of different known values to a load such as an oscillator requiring different voltages at different stages of operation.
Claims12
An integrated CMOS circuit for controlling input voltage to an integrated CMOS load so as to have a value of a reference voltage including a MOS field-effect control transistor connected in series with said load across a power supply and a differential amplifier having an output connected to the gate of said control transistor, characterized by
- a first and a second reference voltage source defining together said reference voltage and being connected in series with the voltage between inputs of said differential amplifier and with said load in a closed loop connection whereby said input voltage to said load is dependent upon the sum of said reference voltages,
- said reference voltages corresponding to the threshold voltages of MOS field-effect transistors in said integrated CMOS load, and
- said reference voltage sources including saturated MOS field-effect transistors which are complementary to each other.
Dependencies are inferred from the claim text.