Question about what parts to use for circuit diagram

[[email protected]]

Hello all! I'm new here and I hope to learn some stuff and also help
others in the future here.

I am trying to imitate a circuit that is introduced in a paper from
IEEE Journal of Solid-State circuits. I need some help at to which
parts I need to use to get similiar results as they have done in the
paper. I have tried fooling around with various parts, but couldn't
get things to work.
Here is a picture of the circuit:
http://img278.imageshack.us/my.php?image=circuit3qt.jpg

The circuit that I'm working on is a modified charge pump.
For the diodes, I'm not sure which MOSFETs to use because it doesn't
mention it in the paper (NMOS or PMOS?).
Also, for the automatic driving buffer, I'm pretty sure those are NOT
gates, but I'm not sure which part to use because the last three of
them have 2 outputs on the NOT gates.
Also, I'm not sure which comparator to use. I'm assuming I can use a
vdc for the voltage ref.
Also, what can I use for the VCO and bias block.
If you guys need the entire paper uploaded, I can do that also.
Once I get the parts right, I'm sure I can wire this up fine...or
not...haha
Anyways, any help on this is greatly appreciated.

 

[Jim Thompson]

Hello all! I'm new here and I hope to learn some stuff and also help
others in the future here.

I am trying to imitate a circuit that is introduced in a paper from
IEEE Journal of Solid-State circuits. I need some help at to which
parts I need to use to get similiar results as they have done in the
paper. I have tried fooling around with various parts, but couldn't
get things to work.
Here is a picture of the circuit:
http://img278.imageshack.us/my.php?image=circuit3qt.jpg

The circuit that I'm working on is a modified charge pump.
For the diodes, I'm not sure which MOSFETs to use because it doesn't
mention it in the paper (NMOS or PMOS?).

PMOS (think DIODE)

Also, for the automatic driving buffer, I'm pretty sure those are NOT
gates, but I'm not sure which part to use because the last three of
them have 2 outputs on the NOT gates.

Certainly a weird looking configuration.

Also, I'm not sure which comparator to use. I'm assuming I can use a
vdc for the voltage ref.
Also, what can I use for the VCO and bias block.

I find VCO controlled charge pumps can lock up in strange ways.

If you guys need the entire paper uploaded, I can do that also.

What does the description in the paper say?

Once I get the parts right, I'm sure I can wire this up fine...or
not...haha
Anyways, any help on this is greatly appreciated.

There's "ChargePump-4X-Example.pdf" on the S.E.D/Schematic page of my
website.

...Jim Thompson

 

[Winfield Hill]

[email protected] wrote...

I am trying to imitate a circuit that is introduced in a paper from
IEEE Journal of Solid-State circuits. I need some help at to which
parts I need to use to get similiar results as they have done in the
paper. I have tried fooling around with various parts, but couldn't
get things to work. Here is a picture of the circuit:
http://img278.imageshack.us/my.php?image=circuit3qt.jpg

The circuit that I'm working on is a modified charge pump.
For the diodes, I'm not sure which MOSFETs to use because it doesn't
mention it in the paper (NMOS or PMOS?).

The diodes are the intrinsic body diodes (note the explicitly-
drawn body connection) of the p-type MOSFETs (note the circle
in the gate).

Also, for the automatic driving buffer, I'm pretty sure those are
NOT gates, but I'm not sure which part to use because the last three
of them have 2 outputs on the NOT gates.

They're inverters, but the extra wire you see is not an output,
but rather a three-state control input (note how the control
wires go into the gate from right angles).

If you guys need the entire paper uploaded, I can do that also.

That'd be a good idea.

 

[Andrew410]

Thanks for replying so fast.

The paper can be downloaded here:
http://download.yousendit.com/121647700CE6E5C9

I already have read the paper and understand most of it conceptually,
but I can't get which parts they used to build the circuit.

From what I have read, the paper doesn't seem to mention much about the

parts but just its functions. Because of this I am struggling to put
the circuit together. I just need something that resembles the
proposed circuit in the paper. The results don't have to be as good as
theirs either. Also, I'm not really building the circuit in real life,
but just need to simulate it through Pspice. The problem is though,
like I have said, is that I'm not sure which parts to use for the
circuit. If someone could just skim through and see which parts I
could try using then that would be great. Thanks in advance!

 

[Tim Wescott]

Thanks for replying so fast.

The paper can be downloaded here:
http://download.yousendit.com/121647700CE6E5C9

I already have read the paper and understand most of it conceptually,
but I can't get which parts they used to build the circuit.
parts but just its functions. Because of this I am struggling to put
the circuit together. I just need something that resembles the
proposed circuit in the paper. The results don't have to be as good as
theirs either. Also, I'm not really building the circuit in real life,
but just need to simulate it through Pspice. The problem is though,
like I have said, is that I'm not sure which parts to use for the
circuit. If someone could just skim through and see which parts I
could try using then that would be great. Thanks in advance!

It asks for a log in.

If it came from the Circuits and Systems society there's a good chance
they're thinking you'll build it into a chip design, so you find the
'parts' in your process's library.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Posting from Google? See http://cfaj.freeshell.org/google/

 

[Andrew410]

You actually don't have to log in. On the link, there is a blue box
with "Download Now" written on it. That should let you download the
file. I just need to know which parts I can use in Pspice from the
default process's library. I had to chose a paper from the IEEE
Journal of Solid-State circuits and I happened to chose this. By the
time I figured out this circuit was difficult to construct, it was too
late for me to change to another paper. So, I am stuck with a
difficult circuit, but I believe this is a good opportunity for me to
learn more about transistors. I just need to know which parts I can
try to get the circuit working decently with decent results. Even if
the results aren't that great, I could still just discuss about the
results.

 

[Andrew410]

As Mr. Hill replied:

They're inverters, but the extra wire you see is not an output,
but rather a three-state control input (note how the control
wires go into the gate from right angles).

I googled it and found that what your talking about is a tri-state
inverter. Am I right? If that is the case then what Pspice part can I
use? I already tried googling "tri-state inverter", but couldn't find
anything that gave me a part number.