See attachment.

WhatZit?

That is, what does it do?

VDD=2V

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

On Mon, 26 Mar 2007 14:45:47 -0700, Jim Thompson
wrote:

See attachment.

WhatZit?

That is, what does it do?

VDD=2V

...Jim Thompson

Lopsided schmitt nand?

John

On Mon, 26 Mar 2007 15:43:17 -0700, John Larkin
wrote:

On Mon, 26 Mar 2007 14:45:47 -0700, Jim Thompson
wrote:

See attachment.

WhatZit?

That is, what does it do?

VDD=2V

...Jim Thompson

Lopsided schmitt nand?

John

Sno-o-o-ort ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

"Jim Thompson" wrote in
message ...
See attachment.

WhatZit?

That is, what does it do?

VDD=2V


rail to rail micro power op-amp?

Cheers

"Jim Thompson" wrote in
message ...
See attachment.

WhatZit?

That is, what does it do?

VDD=2V

...Jim Thompson
--

It's a completely-modulated dual FM light stereo speakers in two compatible
frequencies.

Bob

On Tue, 27 Mar 2007 02:11:16 GMT, "Martin Riddle"
wrote:


"Jim Thompson" wrote in
message ...
See attachment.

WhatZit?

That is, what does it do?

VDD=2V


rail to rail micro power op-amp?

Cheers


You are the closest so far. Of course you have no clue how it works
;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

Jim Thompson a écrit :
See attachment.

WhatZit?

That is, what does it do?

VDD=2V

...Jim Thompson

/
/
/
_______/



--
Thanks,
Fred.

Jim Thompson wrote:
See attachment.

WhatZit?

That is, what does it do?

VDD=2V

All current directions from top to bottom:

Source current of MN1:
Is_MN1 = Id_MN1 = I1 = IDC

Current through R1:
I_R1 = Id_MP1 + Is_MN1 - I3
= Id_MP1 + IDC - IDC
= Id_MP1

Voltage across R1:
V_R1 = V_IN1 - VGS_MN1 = I_R1 * R1 = Id_MP1 * R1

Drain current of MP1:
Id_MP1 = (V_IN1 - VGS_MN1) / R1

Drain current of MP2 is the same, as MP1 is equal to MP2:
Id_MP2 = Id_MP1 = (V_IN1 - VGS_MN1) / R1

Source current of MN2:
Is_MN2 = Id_MN2 = I2 = IDC

Current through R3:
I_R3 = Id_MP3 + Id_MP2 + Is_MN2 - I4
= Id_MP3 + Id_MP2 + IDC - IDC
= Id_MP3 + Id_MP2

Voltage across R3:
V_R3 = V_IN2 - VGS_MN2 = I_R3 * R3 = (Id_MP3 + Id_MP2) * R3

Drain current of MP3:
(Id_MP3 + Id_MP2) * R3 = V_IN2 - VGS_MN2
Id_MP3 + Id_MP2 = (V_IN2 - VGS_MN2) / R3
Id_MP3 = (V_IN2 - VGS_MN2) / R3 - Id_MP2
= (V_IN2 - VGS_MN2) / R3 - (V_IN1 - VGS_MN1) / R1

Drain current of MP4 is the same, as MP4 is equal to MP3:
Id_MP4 = Id_MP3

Output voltage:
V_OUT = V_R2 = Id_MP4 * R2
= R2 * ((V_IN2 - VGS_MN2) / R3 - (V_IN1 - VGS_MN1) / R1)

As MN1 and MN2 are identical, and R1 = R2 = R3:
V_OUT = V_IN2 - V_IN1

So itZ a differential amplifier with a gain of 1.

Laurent


(Replace 'nospam' with 'email')

Jim Thompson wrote:
That is, what does it do?

Looks like a current-output op-amp with a single-ended output (source,
very limited sink. At least, the three output transistors look like a
servo'd current mirror, with MP1 and MP2 providing the differential
capability.

On Tue, 27 Mar 2007 20:32:22 +1000, Clifford Heath
wrote:

Jim Thompson wrote:
That is, what does it do?

Looks like a current-output op-amp with a single-ended output (source,
very limited sink. At least, the three output transistors look like a
servo'd current mirror, with MP1 and MP2 providing the differential
capability.

Only half of this actual IC cell is shown (for proprietary reasons),
but power consumption of the total cell is 1.37uA.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

On Tue, 27 Mar 2007 12:25:12 +0200, Laurent Lamesch wrote:

Jim Thompson wrote:
See attachment.

WhatZit?

That is, what does it do?

VDD=2V

All current directions from top to bottom:

Source current of MN1:
Is_MN1 = Id_MN1 = I1 = IDC

Current through R1:
I_R1 = Id_MP1 + Is_MN1 - I3
= Id_MP1 + IDC - IDC
= Id_MP1

Voltage across R1:
V_R1 = V_IN1 - VGS_MN1 = I_R1 * R1 = Id_MP1 * R1

Drain current of MP1:
Id_MP1 = (V_IN1 - VGS_MN1) / R1

Drain current of MP2 is the same, as MP1 is equal to MP2:
Id_MP2 = Id_MP1 = (V_IN1 - VGS_MN1) / R1

Source current of MN2:
Is_MN2 = Id_MN2 = I2 = IDC

Current through R3:
I_R3 = Id_MP3 + Id_MP2 + Is_MN2 - I4
= Id_MP3 + Id_MP2 + IDC - IDC
= Id_MP3 + Id_MP2

Voltage across R3:
V_R3 = V_IN2 - VGS_MN2 = I_R3 * R3 = (Id_MP3 + Id_MP2) * R3

Drain current of MP3:
(Id_MP3 + Id_MP2) * R3 = V_IN2 - VGS_MN2
Id_MP3 + Id_MP2 = (V_IN2 - VGS_MN2) / R3
Id_MP3 = (V_IN2 - VGS_MN2) / R3 - Id_MP2
= (V_IN2 - VGS_MN2) / R3 - (V_IN1 - VGS_MN1) / R1

Drain current of MP4 is the same, as MP4 is equal to MP3:
Id_MP4 = Id_MP3

Output voltage:
V_OUT = V_R2 = Id_MP4 * R2
= R2 * ((V_IN2 - VGS_MN2) / R3 - (V_IN1 - VGS_MN1) / R1)

As MN1 and MN2 are identical, and R1 = R2 = R3:
V_OUT = V_IN2 - V_IN1

So itZ a differential amplifier with a gain of 1.

Laurent


(Replace 'nospam' with 'email')

Laurent, You are correct!

It is refreshing to see that there are lurkers here who can actually
analyse!

(Circuit is from an RFID tag.)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

On Tue, 27 Mar 2007 11:52:55 +0200, Fred Bartoli
r_AndThisToo wrote:

Jim Thompson a écrit :
See attachment.

WhatZit?

That is, what does it do?

VDD=2V

...Jim Thompson

/
/
/
_______/

Sort of. Equation?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

Jim Thompson a écrit :
On Tue, 27 Mar 2007 11:52:55 +0200, Fred Bartoli
r_AndThisToo wrote:

Jim Thompson a écrit :
See attachment.

WhatZit?

That is, what does it do?

VDD=2V

...Jim Thompson
/
/
/
_______/

Sort of. Equation?

...Jim Thompson

From simple inspection:
ID(MP1) = I(R1) = ID(MP2)

MN1 and MN2 have identical constant bias current so:
*when IN2 IN1
V(MN1s)-V(MN2s)=V(IN1)-V(IN2)

then ID(MP3) = I(R3)-ID(MP2) = (V(IN2)-V(IN1))/R3 = ID(MP4)

then Vout = V(IN2)-V(IN1)

*when IN2 IN1
Vout obviously can't go negative because of the output circuit, but
also because ID(MP2) I(R3). Then the MN2/MP3 loop goes open and MP2
steals some bias current to MN2.


--
Thanks,
Fred.

On Tue, 27 Mar 2007 17:10:57 +0200, Fred Bartoli
r_AndThisToo wrote:

Jim Thompson a écrit :
On Tue, 27 Mar 2007 11:52:55 +0200, Fred Bartoli
r_AndThisToo wrote:

Jim Thompson a écrit :
See attachment.

WhatZit?

That is, what does it do?

VDD=2V

...Jim Thompson
/
/
/
_______/

Sort of. Equation?

...Jim Thompson

From simple inspection:
ID(MP1) = I(R1) = ID(MP2)

MN1 and MN2 have identical constant bias current so:
*when IN2 IN1
V(MN1s)-V(MN2s)=V(IN1)-V(IN2)

then ID(MP3) = I(R3)-ID(MP2) = (V(IN2)-V(IN1))/R3 = ID(MP4)

then Vout = V(IN2)-V(IN1)

*when IN2 IN1
Vout obviously can't go negative because of the output circuit, but
also because ID(MP2) I(R3). Then the MN2/MP3 loop goes open and MP2
steals some bias current to MN2.

Good boy ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

Jim Thompson wrote:

See attachment.

WhatZit?

That is, what does it do?

VDD=2V

...Jim Thompson
Off hand, i dare to guess, it is a reasonably quick micro-power comparator.
--
JosephKK
Gegen dummheit kampfen die Gotter Selbst, vergebens.Â*Â*
--Schiller

On Tue, 27 Mar 2007 07:32:21 -0700, Jim Thompson
Gave us:

On Tue, 27 Mar 2007 20:32:22 +1000, Clifford Heath
wrote:

Jim Thompson wrote:
That is, what does it do?

Looks like a current-output op-amp with a single-ended output (source,
very limited sink. At least, the three output transistors look like a
servo'd current mirror, with MP1 and MP2 providing the differential
capability.

Only half of this actual IC cell is shown (for proprietary reasons),
but power consumption of the total cell is 1.37uA.


Aren't 3904s noisy as hell?

MassiveProng a écrit :
On Tue, 27 Mar 2007 07:32:21 -0700, Jim Thompson
Gave us:

On Tue, 27 Mar 2007 20:32:22 +1000, Clifford Heath
wrote:

Jim Thompson wrote:
That is, what does it do?
Looks like a current-output op-amp with a single-ended output (source,
very limited sink. At least, the three output transistors look like a
servo'd current mirror, with MP1 and MP2 providing the differential
capability.
Only half of this actual IC cell is shown (for proprietary reasons),
but power consumption of the total cell is 1.37uA.


Aren't 3904s noisy as hell?

Hmmm...

"Mirror, mirror upon the wall,
Who is the noisiest noisy of all?"


--
Thanks,
Fred.

On Fri, 30 Mar 2007 08:16:14 +0200, Fred Bartoli
r_AndThisToo wrote:

MassiveProng a écrit :
On Tue, 27 Mar 2007 07:32:21 -0700, Jim Thompson
Gave us:

On Tue, 27 Mar 2007 20:32:22 +1000, Clifford Heath
wrote:

Jim Thompson wrote:
That is, what does it do?
Looks like a current-output op-amp with a single-ended output (source,
very limited sink. At least, the three output transistors look like a
servo'd current mirror, with MP1 and MP2 providing the differential
capability.
Only half of this actual IC cell is shown (for proprietary reasons),
but power consumption of the total cell is 1.37uA.


Aren't 3904s noisy as hell?

Hmmm...

"Mirror, mirror upon the wall,
Who is the noisiest noisy of all?"

What, pray tell, do "3904s" have to do with a CMOS circuit?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

Jim Thompson a écrit :
On Fri, 30 Mar 2007 08:16:14 +0200, Fred Bartoli
r_AndThisToo wrote:

MassiveProng a écrit :
On Tue, 27 Mar 2007 07:32:21 -0700, Jim Thompson
Gave us:

On Tue, 27 Mar 2007 20:32:22 +1000, Clifford Heath
wrote:

Jim Thompson wrote:
That is, what does it do?
Looks like a current-output op-amp with a single-ended output (source,
very limited sink. At least, the three output transistors look like a
servo'd current mirror, with MP1 and MP2 providing the differential
capability.
Only half of this actual IC cell is shown (for proprietary reasons),
but power consumption of the total cell is 1.37uA.

Aren't 3904s noisy as hell?
Hmmm...

"Mirror, mirror upon the wall,
Who is the noisiest noisy of all?"

What, pray tell, do "3904s" have to do with a CMOS circuit?


Don't know but my comment can be read at different levels :-)

--
Thanks,
Fred.

On Fri, 30 Mar 2007 06:47:54 -0700, Jim Thompson
Gave us:

What, pray tell, do "3904s" have to do with a CMOS circuit?

...Jim Thompson

The image that was posted had several of then on it. Duh!

On Fri, 30 Mar 2007 16:42:55 +0200, Fred Bartoli
r_AndThisToo Gave
us:


Don't know but my comment can be read at different levels :-)


Leave it to a frenchy ****tard to think himself as a
psycho-intellectual-comedian.