초록 ▼

An accurate integrated oscillator circuit includes a first circuit generating a substantially temperature independent, or a linearly temperature dependent, reference current and a second circuit which is programmable to incrementally increase the reference current to a desired current level. A third

An accurate integrated oscillator circuit includes a first circuit generating a substantially temperature independent, or a linearly temperature dependent, reference current and a second circuit which is programmable to incrementally increase the reference current to a desired current level. A third circuit includes first and second capacitors and an oscillator output switchable between first and second output levels. The third circuit is responsive to a first charge value on the first capacitor, due to the reference current flowing therethrough, to switch the oscillator output to the first level while resetting the second capacitor to its uncharged state, and to a second charge value on the second capacitor, due to the reference current flowing therethrough, to switch the oscillator output to the second level while resetting the first capacitor to its uncharged state. The oscillator circuit is preferably formed of a single integrated circuit and has an adjustable center frequency.

대표청구항 ▼

An oscillator circuit comprising: means for generating a reference current; a current calibration circuit receiving said reference current and having a number of control inputs thereto, said current calibration circuit responsive to control signals at said number of control inputs to provide a contr

An oscillator circuit comprising: means for generating a reference current; a current calibration circuit receiving said reference current and having a number of control inputs thereto, said current calibration circuit responsive to control signals at said number of control inputs to provide a control current as an incrementally increased representation of said reference current; first and second capacitors; and a switching circuit coupled to each of said capacitors and having an oscillator output, said switching circuit responsive to a first output level at said oscillator output to direct said control current through said first capacitor only and switch said oscillator output to a second level when said first capacitor charges to a first charge value, and to said second oscillator output level to direct said control current through said second capacitor only and switch said oscillator output to said first output level when said second capacitor charges to a second charge value.