FET Quartz oscillators

Details FET Quartz oscillators FET Quartz oscillators

1980-01-29

1982-08-24

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331108D, 368159, H03B 536

Patent

active

043463509

ABSTRACT:
A quartz crystal oscillator for a timepiece including a complementary field effect transistor (FET) pair, wherein one field effect transistor is constant current-biased and the other field effect transistor is self-biased, with high impedance negative feed back loop circuit. The gates of the field effect transistor pair are AC coupled by a condenser, and the drains of the field effect transistor pair are connected to cooperate for AC amplification. The constant current-biased field effect transistor assures a low constant mean current and low start voltage for the oscillator, and the self-biased field effect transistor assures a sure amplifying operation. The AC coupling of the gates assures a high amplification factor and high efficency in excitation of a quartz crystal resonator of an oscillator, whereby the constitution of this invention is simple and easy to form in a monolithic IC chip for a timepiece.

REFERENCES:
patent: 3829795 (1974-08-01), Minney
patent: 3887881 (1975-06-01), Hoffmann
patent: 3956714 (1976-05-01), Luscher
patent: 3959744 (1976-05-01), O'Connor

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