Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Patent
1997-10-16
1999-02-09
Mis, David
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
331 57, 331143, 331177R, H03B 504, H03B 524
Patent
active
058700048
ABSTRACT:
The frequency of an integrated oscillator is held constant by using temperature compensation to compensate for the component variations due to temperature variations. A voltage controlled oscillator, which has temperature dependent components, is compensated with a temperature dependent control voltage. The frequency of many kinds of oscillators such as a relaxation oscillators and ring oscillators can be held constant when the operating current is held constant. The operating current is often derived from a current source, which is a voltage to current converter with a current equal to the ratio of a control voltage to a resistance. Since semiconductor resistance has a positive temperature coefficient is used to obtain a temperature invariant current source. The positive temperature coefficient is obtained with the difference junction voltage of two forward-biased pn junction voltages. The magnitude can be controlled by junction areas of the two junctions. The magnitude can also be amplified.
REFERENCES:
patent: 5440277 (1995-08-01), Ewen et al.
Lin H. C.
Mis David
Utron Technology Inc.
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