I have looked at the AD835 and other 4-Q multipliers but they are costly a nd power hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design that will be used in a high reliability product. Input range of 0.05V to 1.70V with a bandwidth of dc to at least 1.0MHz. Simplicity, small size, low powe r
I have one TDA8145 pulled from, probably a monitor (possibly a Trinitron??).
Good luck finding any though, :^)
You might be able to get away with a "linearized JFET" circuit. No idea if they can be made that accurate over operating range, and would probably need trimming (you didn't mention if that's a no-no).
DC-1MHz makes PWM a stretch, but not impossible.
Tim
-- Deep Friar: a very philosophical monk. Website:
power hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design that will be used in a high reliability product. Input range of 0.05V to 1.70V with a bandwidth of dc to at least 1.0MHz. Simplicity, small size, low power
x^2 = exp(2*ln(x))
log-antilog with thermistor temperature compensation?
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Dual integrator with reset and sample hold ?
Vladimir Vassilevsky DSP and Mixed Signal Consultant
and power hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design tha t will be used in a high reliability product. Input range of 0.05V to 1.70V with a bandwidth of dc to at least 1.0MHz. Simplicity, small size, low pow er
Find a microcontroller with a 10Msa ADC and do the multiply in that. Will c ost you max 1 USD. Then you can do more complex arithmetics
Regards
Klaus
power hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design that will be used in a high reliability product. Input range of 0.05V to 1.70V with a bandwidth of dc to at least 1.0MHz. Simplicity, small size, low power
MC1594?
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
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| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
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I love to cook with wine. Sometimes I even put it in the food.
I'm not sure you'll get that speed at that price -- but it'd certainly be worth looking!
-- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
Is it still available?
I worked next to a guy who was responsible for a board with that part, and every time the manufacturer changed their process he'd have to tweak values on the board to keep the performance up to snuff.
(But, they needed drifts to be spot on -- if that's not the case here, then you're probably OK-er).
-- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
and power hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design tha t will be used in a high reliability product. Input range of 0.05V to 1.70V with a bandwidth of dc to at least 1.0MHz. Simplicity, small size, low pow er
power hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design that will be used in a high reliability product. Input range of 0.05V to 1.70V with a bandwidth of dc to at least 1.0MHz. Simplicity, small size, low power
A nonlinear segment circuit would probably work at this speed and accuracy.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
The MC1594 must be one of JT's old designs using Vac tubes. Normal PS is +/-15V with +/-4.0V of CM dead range so worthless in +/-5V unit. i shoulder added +/-5V operation is a requirement.
Regards, Harry
I agree John, a nonlinear circuit would be simpler in my design. If I could design a circuit who's output would be 1/Vin with all my other requirements, that would be perfect. Trimming is not allowed, got to work in production, no tweaking, every time. Regards, Harry
Three logic inverters in series, with resistor feedback and resistor to the input. Makes voltage to frequency convertor with square law dependence. Then a monostable to convert back F to V. One logic IC that's all it takes.
Vladimir Vassilevsky DSP and Mixed Signal Consultant
power hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design
How about LM13700 (figure 6 on the datasheet is a multiplier)? It's not happy at your temperature extremes, but it IS cheap and runs on fleapower.
power hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design
power hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design
Yea but that +/- 15v IC will not operate in a +/-5V domain.
Thanks, Harry
power hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design that will be used in a high reliability product. Input range of 0.05V to 1.70V with a bandwidth of dc to at least 1.0MHz. Simplicity, small size, low power
Was going to say RC4200, but Fairchild dropped the ball after taking it from Raytheon.
So:
RL
Harry D a écrit :
power hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design that will be used in a high reliability product. Input range of 0.05V to 1.70V with a bandwidth of dc to at least 1.0MHz. Simplicity, small size, low power
Does BW need to be 1MHz on both inputs?
If not you could use a digipot with a small uc with an integrated ADC (or build your own with internal comparator) for the slow input.
-- Thanks, Fred.
Fred Bartoli a écrit :
Sorry I missed the squarer part, only retaining the multiplier.
Forget that.
-- Thanks, Fred.
costly
< hogs. I need a simpler (+/-5% accuracy [-40C to 105C]) design that will be used in abandwidth
You might consider a multiplying DAC. But they are also expensive and you would need an A/D as well as (in some cases) an SPI interface for the digital input. Here is one:
The AD633 multiplier is reasonable cost but minimum +/- 8V:
I have about 15-20 pieces of AD534 in 14 pin gold/ceramic DIP I can offer for well under the present list prices, but it is also minimum +/- 8V.
The best option may be a PIC with dual simultaneous high speed A/D and hardware multiplier. The output could be PWM or digital into an external
DAC.
You might be able to use the diode square law function as described here:
or more recently:
Another technique is using PWM where the amplitude as well as the pulse width are derived from the signal you want to multiply.
Also look at the LT2940, which uses a multiplier for power measurement:
This old post may help:
Paul
I don't know, probably. One of my junior engineers did that version, as his Master's and included _my_ NPN-PNP mirror turn-around.
The only error mechanism would have been offset. Maybe your "next to a guy" didn't read the appnote ;-) ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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