Fast starting on-chip crystal oscillation circuit

Details Fast starting on-chip crystal oscillation circuit Fast starting on-chip crystal oscillation circuit

2006-08-08

2006-08-08

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S158000, C327S143000

Reexamination Certificate

active

07088193

ABSTRACT:
A fast starting on-chip crystal oscillation circuit includes a (Vdd) IC pad, a (Vss) IC pad, a 1stcrystal IC pad, a 2ndcrystal IC pad, a 1sttransistor, a 2ndtransistor, an inverter, a resistor, and two capacitors. The 1stand 2ndcrystal IC pads couple an external crystal oscillator to the fast starting on-chip crystal oscillation circuit. The 1stand 2ndtransistors, when activated, couple power to the inverter. The input of the inverter is coupled to the 1stcrystal IC pad and to the 1stcapacitor. The output of the inverter is coupled to the 2ndcrystal IC pad and to the 2ndcapacitor. The resistor is coupled in parallel with the inverter. When the 1stand 2ndtransistors are activated, an impulse voltage occurs between the 1stand 2ndcrystal IC pads to initiate the oscillation of the crystal oscillator.

REFERENCES:
patent: 5805027 (1998-09-01), Yin
patent: 6160457 (2000-12-01), Wu
patent: 6329884 (2001-12-01), Tsukagoshi et al.
patent: 6703905 (2004-03-01), Sekimoto

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