Integrated circuit comprising an oscillator

Details Integrated circuit comprising an oscillator Integrated circuit comprising an oscillator

1999-05-11

2000-08-29

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331117FE, 331116R, 331117R, 331108C, 331158, 331179, H03B 512, H03B 536

Patent

active

061114731

ABSTRACT:
An integrated circuit (IC) comprising an oscillator (OSC) has a first amplifier (AMP.sub.1) and a second amplifier (AMP.sub.2). The first and the second amplifier (AMP.sub.1, AMP.sub.2) each have a non-inverting input, an inverting input, and an output. The output of the first amplifier (AMP.sub.1) is connected to the non-inverting input of the first amplifier (AMP.sub.1) and also to the non-inverting input of the second amplifier (AMP.sub.2). The output of the second amplifier (AMP.sub.2) is connected to the inverting input of the first amplifier (AMP.sub.1) and also to the inverting input of the second amplifier (AMP.sub.2). The first amplifier (AMP.sub.1) is loaded with a capacitor (C) connected between the output of the first amplifier (AMP.sub.1) and an external power supply terminal (1). The second amplifier (AMP.sub.2) is loaded with a further capacitor (C.sub.F) connected between the output of the second amplifier (AMP.sub.2) and the external power supply terminal (1). A bias resistor RB is connected in parallel with the capacitor (C). A quartz-crystal (Q), for determining the frequency of the oscillator (OSC), is connected between the external power supply terminal (1) and an external signal terminal (X.sub.T). The external signal terminal (X.sub.T) is the only extra external terminal of the integrated circuit (IC) needed for the oscillator (OSC).

REFERENCES:
patent: 4980655 (1990-12-01), Whitehead
patent: 4994764 (1991-02-01), Peters
patent: 5063359 (1991-11-01), Leonowich
patent: 5912596 (1999-06-01), Ghoshal
"A One-Pin Crystal Oscillator for VLSI Circuits", by Joseph T. Santos et al., IEEE Journal of Solid-State Circuits, vol. 19, No. 2, Apr. 1984, pp. 228-235.

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