74HC04 Linear Amplifier
Mike Morrin email (remove spam text)
At 03:29 pm 13/03/99 -0500, Sean Breheny wrote:
>In Horowitz and Hill's "Art or Electronics", I see several illustrations of
>very clever little "linear" amplifier configurations using CMOS
>inverters,especially the 74HC04. I have an application (which DOES use a
>pic,as a freq. counter) where I need to take in a 100mV or so signal from
>about 100Hz or so up to 50MHz and convert it into a 0-5V square wave. There
>is a circuit in H&H which is similar to this and I have been using it as a
>guide,but I am having problems. The basis of the circuit is simply two
>inverters,the output of one connected to the input of the other. The first
>inverter also has a 1Meg ohm feedback resistor across it,and the second one
>doesn't. All other inverters on the chip have their inputs tied high or low.
>The behavior I'm seeing is incessant oscillation.
You can generally only use unbuffered CMOS gates in linear mode. The only
ones I have seen commonly available are 4001UB, 4011UB and 4069UB.
Are you sure your reference specified HC parts?
seeking: microchip devices pic
In reply to: <email@example.com. edu>
See also: www.piclist.com/techref/index.htm?key=74hc04+linear+amplifier
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