# One input with a conjugate output IC search

#### captoro

Joined Jun 21, 2009
207
Hello,

Anyone know an IC with one input and two conjugate outputs ?
Basically I have a signal and I would like to get the same signal out AND its conjugate signal.

thanks

Ken

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#### crutschow

Joined Mar 14, 2008
34,073
What is the nature of the signal, and what exactly would the conjugate of that be?

#### captoro

Joined Jun 21, 2009
207
What is the nature of the signal, and what exactly would the conjugate of that be?
Hi,

This is a square wave signal coming from a Pic chip.
In attachment is what I need.
Probably should of used the word complementary instead of conjugate.

Ken

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#### crutschow

Joined Mar 14, 2008
34,073
To get the complementary signal of a square-wave you simply run it through an inverter (either a digital inverter gate or a common-emitter transistor stage).

#### MisterBill2

Joined Jan 23, 2018
17,881
OK, it seems from the expression you are asking for the signal and it's compliment, That part will be simple if it is a digital square wave, BUT to do it with a single IC we need to know the voltage and the frequency, at least approximately. Is it hertz, megahertz, or gigahertz? And what voltage range?

#### captoro

Joined Jun 21, 2009
207
[1sterBill2, post: 1651959, member: 512401"]
OK, it seems from the expression you are asking for the signal and it's compliment, That part will be simple if it is a digital square wave, BUT to do it with a single IC we need to know the voltage and the frequency, at least approximately. Is it hertz, megahertz, or gigahertz? And what voltage range?
[/QUOTE]
1khz at 5volts

#### peterdeco

Joined Oct 8, 2019
484
The PIC itself can be programmed to give you the outputs you want.

#### MisterBill2

Joined Jan 23, 2018
17,881
A CD4049 can deliver at least 2 sets of waves and their inverted wave and it costs less than a dollar and requires zero programming and it consumes FAR less power. Also it is good up to several megahertz without additional adjustment.

#### MrChips

Joined Oct 2, 2009
30,518
There are many ICs that provide differential outputs, any RS-422 or RS-485 driver, for example.

#### captoro

Joined Jun 21, 2009
207
A CD4049 can deliver at least 2 sets of waves and their inverted wave and it costs less than a dollar and requires zero programming and it consumes FAR less power. Also it is good up to several megahertz without additional adjustment.
Isn't the CD4049 an inverter? Yes I can get their invertered but the signal going through the CD4049 will be delayed few clock cycle relative to the input.... Isn't there an IC that can have Q and Qprime as output?

#### Ian0

Joined Aug 7, 2020
9,531
Assuming it's digital:
CD4041
or
74HC86 - quad exclusive or gates. Two gates, one with the spare input tied low and one with the spare input tied high.

Assuming it's analogue:
THS4531

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#### captoro

Joined Jun 21, 2009
207
Assuming it's digital:
CD4041
or
74HC86 - quad exclusive or gates. Two gates, one with the spare input tied low and one with the spare input tied high.

Assuming it's analogue:
THS4531
CD4041 is what I need, thank you.

#### Ian0

Joined Aug 7, 2020
9,531
CD4041 is what I need, thank you.
Hope you're not trying to drive any long cables with it, or MOSFET gates.

#### Ian0

Joined Aug 7, 2020
9,531
CD4041 is what I need, thank you.
If you look at the datasheet, you'll see that one output has two inverters and the other has a single inverter - in other words, just the same as if you'd used a 4049 or 4069.
If you wanted equal propagation delays, the 74HC86 would have done a better job.

#### captoro

Joined Jun 21, 2009
207
If you look at the datasheet, you'll see that one output has two inverters and the other has a single inverter - in other words, just the same as if you'd used a 4049 or 4069.
If you wanted equal propagation delays, the 74HC86 would have done a better job.
Right 74HC86 would be better forgot about propagation delays . thank you

#### MisterBill2

Joined Jan 23, 2018
17,881
How fast is the clock that the propagation delay of a CD4049 running on 15 volts is several clock cycles?We were never given a frequency specification, I don't think.