Does it work as an amplifier?This CMOS inverter worked as an logic inverter very well. But when I tried to apply to crystal oscillator as below.
You don't often see the "R" in circuit diagrams for the Pierce oscillator using a 74HC04, but it is there as the output impedance of the gate. A physical resistor is only required for low frequency oscillators.The feedback network for an inverting amplifier must be able to provide a phase shift of -180deg at the desired oscillation frequency. This can be realized using a 3rd-order lowpass in the classical ladder topology R-C-L-C (both C grounded). The inductance L can be realized with crystal - however the resistor R is missiung in your feedback network.
Is M2 depletion mode? (Constant current source for the load of M1)
Maybe work did not allow for any significant spare time. Color me impressed.Welcome to AAC! First post after 11 years...
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I didn’t think that they were particularly symmetrical in a 74hc04.One additional consideration: What about the symmetry of both transistors?
Dear Audioguru,The input capacitance of the Power Mosfets you are using is much Too High for the crystal oscillator circuit.
I think the 12MHz frequency is even too high for a Cmos IC oscillator. Old LS TTL ICs were used many years ago.
I cropped and enlarged your schematic to make it easier to see the text:
by Duane Benson
by Duane Benson
by Jake Hertz
by Jake Hertz