CMOS Oscillator having positive feedback capacitor charged and d

Details CMOS Oscillator having positive feedback capacitor charged and d CMOS Oscillator having positive feedback capacitor charged and d

1982-09-27

1984-08-14

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331143, 331177R, 331DIG3, H03K 303, H03K 3353

Patent

active

044659830

ABSTRACT:
An oscillator including an amplifier which is formed by CMOS inverters and has a positive feedback path from an output to an input of the amplifier. The positive feedback path includes a capacitor which is alternately charged and discharged by switched constant current devices controlled by the amplifier and connected to the amplifier input. The amplifier includes a second capacitor in a negative feedback path to limit voltage swings at the amplifier input. The constant charging and discharging currents can be produced by current mirrors which are controlled to control the oscillation frequency.

REFERENCES:
patent: 3723907 (1973-03-01), Tajchman et al.
patent: 3973222 (1976-08-01), Kucharewski
patent: 4151473 (1979-04-01), Coleman et al.
patent: 4316158 (1982-02-01), Akita et al.

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