Linear voltage-controlled saw-tooth oscillator

Details Linear voltage-controlled saw-tooth oscillator Linear voltage-controlled saw-tooth oscillator

1975-05-27

1976-05-25

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331177R, H03K 450

Patent

active

039597431

ABSTRACT:
In the inventive voltage-controlled oscillator, relationship between an input control voltage and an output oscillation frequency is made substantially linear by utilization of charging and discharging operations of a capacitor. The capacitor is charged with a constant current value of which is dependent upon the value of the control voltage, and the capacitor is being discharged when the charging voltage has reached a predetermined level. The charging level of the capacitor is variable and it drops as the oscillation frequency increases. This is achieved by providing a low-pass filter between the capacitor and a voltage source. According to this arrangement, as the frequency increases, the voltage applied to the capacitor equivalently decreases, whereby a discharging period of the capacitor is shortened and linearity in the relationship between the input control voltage and the output oscillation frequency is obtained.

REFERENCES:
patent: 3621469 (1971-11-01), Bauer
patent: 3694772 (1972-09-01), Sordello
patent: 3824494 (1974-07-01), Wilcox

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