Oscillator amplifier with input clock detection and method...

Details Oscillator amplifier with input clock detection and method... Oscillator amplifier with input clock detection and method...

2011-04-12

2011-04-12

Kinkead, Arnold (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S1160FE, C331S1160FE, C331S074000, C331S135000

Reexamination Certificate

active

07924108

ABSTRACT:
An oscillator circuit has a crystal oscillator amplifier having only two clock input terminals, one being an input terminal and the other being an output terminal. The input terminal allows a user of the integrated circuit to choose between connecting a first clock signal generated from a crystal or a second clock signal generated by a non-crystal source to the input terminal. Control circuitry has a capacitor coupled in parallel with a transistor. Both are coupled in series with a resistive device at an output of the control circuitry to provide a control signal. Clock generation circuitry coupled to the crystal oscillator amplifier provides an oscillating output signal in response to an enable signal. In one form a comparator circuit provides the oscillating output signal. The control signal is used to ensure that inputs to the comparator circuit repeatedly cross each other over time.

REFERENCES:
patent: 4370625 (1983-01-01), Someshwar
patent: 4583013 (1986-04-01), Gupta
patent: 4982116 (1991-01-01), Lee
patent: 5369377 (1994-11-01), Benhamida
patent: 6819196 (2004-11-01), Lovelace et al.
patent: 6900701 (2005-05-01), Chan
patent: 7411467 (2008-08-01), Alford
patent: 2001/0029589 (2001-10-01), Takai

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