Logic Level Translator

It consumes the whole CD4007, since the associated N-channel devices are tied off.

I was just demonstrating the principle.

Have fun ;-) (Analog or digital?)

...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     |
             
I love to cook with wine.      Sometimes I even put it in the food.

Of how a logic level translator is designed.

Can't you read?

...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 | |

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

--
Which was???

[snip]

The "kinkiness" comes from lack of gain in the feedback. Change

74HC04 to 74HC14 and it becomes letter perfect.

I'm still refining it, but you can also do a similar (more current consumptive) trick using a single 74HC14 wrapped around with a PNP current mirror. Consumes current rather than being zero at the end states, but it's cheap on parts.

...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     |
             
I love to cook with wine.      Sometimes I even put it in the food.

Hello Jim,

But this consumes a good half of the chip for just one data line.

There I could see it. You don't have to sacrifice another SO or TSSOP package there.

I usually do it discrete. I'd try anyways but have to do some math right now. Filter algorithms ... blech...

Regards, Joerg

Hello Jim,

Digital this time which is why it's not that much fun. The real disappointment came when I happily perused today's offerings of DSP and found out that the ones with 16bit codecs on board have gone AWOL. So now I'll have to figure out how to schlepp 14-15 rather unorthodox single-bin DFTs through a uC or bite the bullet and use a TMS320 plus external ADC. These DFTs can't all have the same sampling frequency which makes it even less fun with an off-chip ADC. This is also why FFT wouldn't work here. The other challenge in this project is that the classical and expensive DSP books here on the shelf fall quite silent when it comes to weird filters.

The good news is that the uC world has made much more progress than DSP since I last used one. You can get 16 bitters with hardware multipliers for under $5 a pop. And you don't have to spoon-feed them their code from an EPROM anymore. Nice.

Regards, Joerg

[snip]

The latest version is here...

Much simpler, easily adjustable thresholds.

...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 | |

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Further improved at...

Thresholds centered up around 3.3V/2 and hysteresis narrowed.

QED ;-)

...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     |
             
I love to cook with wine.      Sometimes I even put it in the food.

Why can't you see this (and others you've posted) documents when I go to

and then select the SED link?

I prefer to download PDFs then open them rather than doing that in a browser.

Robert

I can link them into the SED cover page if you like. I tend to link only circuits that should be of more universal interest.

Can't you set your browser to download rather than open? In Firefox you can.

...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     |
             
I love to cook with wine.      Sometimes I even put it in the food.

[snip]

Thanks. Didn't know that was an option in Firefox. Set that way now.

Robert