Re: VHF low level to TTL converter

On Sun, 04 Dec 2005 21:05:15 +0800, Richard Hosking <richardh@xxxxxxxxxxxx>
wrote:

>Dear all
>I want to convert 0.8V P-P (50 ohms), centred on 0.4V DC to TTL logic
>levels, from about 1 to 120 MHz.(input to a 74ACT163 binary counter)
>Whats the best/cheapest way of doing this, preferably with a single +5V
>supply and low current? Linearity is not critical
>I thought of using a video amp, but it would need dual supplies.

Synthesiser or frequency counter?

Do you need full count output or can you survive on a submultiple of the VHF
input e.g. /4 or /10?

For counter preamp with speed, in the "good old days" we used the MC10216 triple
line receiver as a limiting amp. Nowadays the 10116 seems still available, but
as you'd appreciate that generation of ECL was thirsty.
.

Relevant Pages

  • Re: VHF low level to TTL converter
    ... >Richard Hosking wrote: ... Linearity is not critical ... >> I thought of using a video amp, but it would need dual supplies. ... >delays and counter enable set-up times pull you back to about 50MHz. ...
    (sci.electronics.design)
  • Re: VHF low level to TTL converter
    ... >>I thought of using a video amp, but it would need dual supplies. ... >Synthesiser or frequency counter? ...
    (sci.electronics.design)