Re: AoE question

On 26 Sep 2006 15:07:59 -0700, "garyr" <garyr@xxxxxxxxxxx> wrote:

On page 654 is a schematic of a varactor-tuned PLL. Can someone please
tell me why two 'HC04s are used to square up the reference signal input
to the 'HC390. Wouldn't one be enough?

The first 'HC04 is biased with the 1Meg resistor to the "sweet spot"
(threshold) so that it is sensitive to small input signals.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

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