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High Voltage Cmos

156 Threads found on edaboard.com: High Voltage Cmos

Looking for a circuit which can reverse polarity using just one control input line

Use output to control relay or high Side power switch using 3V logic and supply. Logic voltage = minimum input V+ swing to guarantee Hysteresis e.g. 3~3.3V Signal clamps must use Schottky diodes to protect cmos. R values can be scaled up if desired. 131366 It also converts the bipolar input voltage to the supply voltag

Low impedance of current mode circuits

Hi i am learning about current mode circuits. CMC (current mode circuits) have low impedance since the input signal current is given to the cmos drain and not gate. Since by nature gate has high input impedance where the input voltage signals go. So when meaning CMC has low impedance does it only mean wer in the transistor do we give the (...)

high supply voltage amplifer made by low and high voltage mosfet?

Does there any paper related to this topic? high supply voltage, cmos folded-cascade amplifer made by low voltage mosfet and high voltage mosfet both. thanks.

Why Drain sharing is preferred?

For speed and leakage you want to share the terminal that moves and sees the high voltage. Share drain for a common-source configuration (and cmos logic) and share source for a common-drain (source follower) one.

CD4007 experiment to build a push pull

Hi, Hot means power dissipation. Power dissipation means current. The device is specified for some mA of output current. If you ensure that the current is within these some mA then the temperature rise should be low. Not hot. Therefore I assume the output current is too high. Other possibilities: * floating inputs * high frequency

Tough MCU Against Extreme Conditions

Not really. the susceptibility to EMI has everything to do with the resulting voltage level from the source power and impedance and the coupling impedance relative to the input. If the input is connected to long shielded or twisted pair wires, then immunity is improved. All cmos inputs are exceptionally high impedance and fairly low (...)

Cadence- ams h35b4 kit-designing transimpedance amplifier for a photodetector

Hello everyone, I am designing a Capacitive transimpedance amplifier for a GaN photodiode whose breakdown voltage is as high as 60-70V. I need to do a cmos ROIC for the same. However, when I was designing, I needed to use a mosfet model that could withstand such a high voltage. I looked at nmosi models (...)

purpose of level shifter in vlsi

Consider what's the minimal Vih level for a cmos inverter residing in the high voltage domain.

Temperature cut off?

Analog Comparator gives logic level out to drive logic level high side switch. But if thermal sensor is just for regulator, does it have have thermal shutdown? I would recommend a smart high-side switch with thermal shutdown used in automotive. Tons avail from

Totem pole outputs creates glitches?

Most of us do not see anymore the totem pole outputs that were in old TTL logic ICs. Modern cmos outputs are complementary push pull but have a low current. high speed cmos push pull outputs conduct so much current when their voltage is halfway that they have a minimum switching speed so that they do not overheat while (...)

levitation system - pid controller

which hall senser ic ,u used ?? vcc voltage ?? if u wana to use nly sense the position of magnet, On (LOW) with magnetic South Pole and Off (high) without magnetic field or with magnetic North Pole, if you need inverted output, use a NPN Transistor like BC547 or FET or inverter chip like cmos CD40106 or TTL 74LS04 or use an opamp and get (...)

ir2110 and 555 circuit does not working

Your DC supply voltages are wrong. The 555 uses a +15V supply so its output high voltage is +13.5V which has destroyed the 74HC04. Why don't you use a cmos 555 using a 5V supply instead? The IR2110 has a logic supply of +15V but the logic from the 74HC04 is only +5V. Then the logic supply for the IR2110 must be +5V.

CMOS reference circuits for high frequency circuits

Hai What are the issues that we must take into consideration in designing reference circuits(voltage and current) for high frequency circuits thank you

There are over 100 logic families available from DigiKey. Tradeoffs exist for speed, output impedance,,fanout, cost,,voltage,,current transition frequency, input threshold and noise margin. LVC2 are very popular for logic and used in ARM chips with 25 Ohm output resistance at low voltage and high speed with low quescent current,,and (...)

high to low voltage CMOS level shifter circuit

Hi, I am looking for a high to low level cmos level shifter. Can somebody refer some circuit. regards

Transistors and FET switching times and duty cycles

FETs have voltage controlled resistance with a threshold effect determined by geometry and fab this has improved over the decades in Enhancement mode MOSFETs standardized from 4.5V to 2.5 ... to 400mV for LVC2 logic level drive. high Threshold cmos such as Hcmos series has a wide Vdd range and

Difference between IC 74C14 and 74HC14

74C series is standard cmos, high voltage (3 - 15 V) logic series. You can use CD40106 as a replacement. Or use 74HC14 with lower supply voltage, e.g. 4.5 V. Although is has 6V supply voltage range, the value may be exceeded when using new batteries.

Absolute maximum ratings are missing from the datasheet of this digital isolator?

thanks for the abs max, ...the input high and low is given on page two. Page 2 is blank.

3.3 V to 1.8V level converter

Any time you specify voltage, high speed and logic, one also needs to specify impedance of source, load , capacitance and current. The fanout requirements for 1 gate load are trivial compared to level translator for a clock driver with 20 loads. The slew rate of your Op Amp is probably the limiting factor in your design. cmos is a (...)

do CMOS chips need resistors on "1" inputs?

TTL has a natural pullup and, if the pin is truly open, will assume a weak (but adequate) "1" state. Of course that key assumption should not really be relied upon, in the field. cmos inputs tehd to be very high impedance with ESD clamps roughly balanced, and you have no good idea where pin voltage will end up unless you do something (...)

Maximum Voltage a CMOS can withstand

cmos RF switches tend to use stacked devices on SOI to get high power handling and linearity. I would not expect more than about 1.2V nominal DC rating, maybe 1.3-ish DC max. What kind of AC "bonus" you can claim would depend a lot on how the device behaves at the limits - linearity matters, isolation matters, in addition to simple reliability (wh

doubt in cmos oscillator design

If propagation delay affects the frequency of a high frequency oscillator made with ordinary slow cmos inverters then increase the supply voltage to speed them up or use high speed cmos (74HCxxxx).

Increase the voltage at the output pin of optocoupler?

Hello, We are using your SFH6732 model Vishays optocoupler. We applied 5V to its VCC and 24V 6.2ma to its input. When i measure its output i see 3.8V. In order to make a PIC's input pin high, voltae should be at least 4V. Can i do anything in order to get at least 4V from optocouplers output except increase Vcc. Can i use pull-ups? T

output voltage swing !

I do not know what you want to measure. If the opamp is cmos and the load resistance is high then the output voltage swing is rail-to-rail. if the opamp uses ordinary transistors then the output voltage swing depends on how many emitter-followers there are at the output.

Interfacing RN41 Bluetooth module to SoC

If both devices works at same voltage level no need to worry you can connect directly. If one is at 3.3v and another is at 5v and if it is UART interfacing (RX, TX) you can use simple resistor divider to connect the Tx of 5v chip to Rx of 3.3v chip. Connect directly the 3.3v Tx to Rx of 5v chip. (For cmos high is >= 2/3Vdd to Vdd which (...)

cmos rectifier for high efficiency rf energy harvesting

hello everyone, i'm having trouble with this the output of my 3 stage cmos rectifier is 0.4 with input vrf = 0.25V, then if i connect the rectifier to a non-overlapping and self-oscillating clock and a voltage doubler circuit the output of my rectifier becomes 0.16V and the final output of my voltage doubler is 0.5V..but if i change the (...)

Threshold Loss Problem

If it's referring to the change in threshold voltage that can occur, one cause is the buildup of charge in the gate oxide from various causes. For example, tunneling of electrons can occur into the thin oxides used in the high speed cmos processes.

Biasing of high voltage CMOS transistors in mixed signal application

Hi all, I am planning to use high voltage transistors from XFAB XH035 process for a biomedical application. Output drive required is 18V and I am planning to use 18V drain NMOS and PMOS transistors with maximum rated Vgs and Vds of 18V for my application(Please see the attached pic). My question is whether I can bias the HV-NMOS and

why using CMOS 4069 inverter as ampilifer?

Here is a very old graph showing the typical gain and frequency response of an ordinary cmos inverter used as an amplifier. The gain and frequency response are affected a lot by changes in the supply voltage. The distortion is very high if the output swing gets anywhere near VCC or VSS.

Do PICs exhibit a voltage drop ocross their output or do they swing Vss to Vdd?

All cmos drivers go rail to rail with no load and drop voltage with current. Using Ohm's Law on the incremental drop you can calculate the ESR of the drivers. Some of the better drivers are found in Atmel CPU"s with 25 Ohm drivers and others are as high as 100 Ohms and original cmos > 300 Ohms.

Square wave generation with inverter chain

RCA invented cmos logic ICs a long time ago. They published a graph that shows the fairly high voltage gain of unbuffered cmos inverters. With a small input signal level then the output clips it into a squarewave. With a larger input level then the clipping is more and the squarewave is even better. Only when the output (...)

analog DC voltage register

Its called a sample and hold. The cheapest way is to charge a capacitor via a diode, if the load resistance is extremely high the voltage will remain on the capacitor for some time (but not days!). There are specialized ICs for this purpose - use Google. Frank

Why we do not see cheap DDS for high frequencies on the market?

the processes available are most likely limiting the ability to do the mixed mode DDS type circuit functions at a higher frequency. You can buy a GaAs one if u need, but it will costs thousands of \$ probably.

purpose of Resistors and Capacitors in CMOS inverter as a small signal amplifier

If the cmos "amplifier" has only 5V for its power supply and it is a cmos IC like a CD4069 then its voltage gain is about 100 with no load. But when its output level is near the rails then its distortion is very high. Usually its input is auto-biased from its output and it is inverting like this:

[Moved] And Gate for 24v DC signals

The logic can be made as discrete DTL circuit. Another option is to use 15V CD4000 cmos with voltage dividers and output level converters. Special high-voltage ICs have been previously made, e.g. SAA1029 (from Signetics or Valvo, I think).

switching between two ac voltage

the signal uref1 and uref2 that i want switch between them are a 0~25v semi sine wave(almost square) with frequency of 444Hz.bc selected signal goes to a high impedance emitter follower stage the current is not high,i think it should be around 100mA or less. If you can use an 80V, 80 ohm cmos switch then there are

question : cmos push pull amplifier with high slew rate

Hello, I need a cmos amplifier circuit with high SLEW rate. The load is a RC type with values 200 ohm and 2 nano F. Max load current is -10mA to +10mA Supply voltage VDD = 4.5V Any suggestions or any reference papers for reading ?

Help regarding sizing MOS for rectifier

Hi, I am designing a high efficiency cmos rectifier for biomedical applications. I have attached the circuit along with the output voltage waveforms. Though it is fully rectified, the waveforms tend to extend highly into negative region. How could I possibly size the mosfets to prevent this? I have simulated the (...)

Resonance load or (inter-stage) impedance matching for CMOS amplifiers

Hi all, Given a millimeter-wave multi-stage common source/cascode cmos amplifier. Which method would be the proper design: inter-stage conjugate matching or resonance load (adjacent stage should be place close in the layout)? For cmos transistor, it is gate-source voltage controlled device, it is more important to provide (...)

CMOS RFIC or GaN technology the best choice of today

cmos process is cheap,less reliable,universal process,low voltage GaN process is expensive,high reliable,robust,foundry dependent Both are possible,all depends on the application..

Class AB Cmos output stage

The book "Compact Low-voltage and high-Speed cmos, Bicmos and Bipolar Operational Amplifiers" by Klaas-Jan de Langen and Johan H Huijsing deals with a whole host of class AB output stages. You might want to take a look at that.

How to reduce the leakage current in CMOS Analog Switch??

There's leakage and there's leakage. A high voltage mux will have a lot of junction area and depletion volume, and you can see substantial input-supply, output-supply leakages. Using as little headroom voltage as necessary will help this; so too will using a lower voltage switch, so you will have smaller FETs. A low on (...)

Overvoltage protection using Schottky barrier diode

That is not solution Your answer suggests that you didn't yet get the idea of a clamp circuit, as proposed by alex (and typically used in industry standard equipment). A clamp circuit is different from a voltage divider. It's placed in front of a high impedance input, e.g a cmos buffer, and only reducing the voltage if (...)

CMOS output when Gate terminal is Float

It depends on source and drain voltages. Anyway if drain and source and gate were open, the output voltage would be float (high zero or high Impedance).

What is the BF MOAT layer?

BF MOAT blocks all implants to the substrate. It can also be used th block buried layer implants prior to epitaxy in bipola and high voltage processes.

basic digital electronics

Why the power dissipation is more during the transition of clock rather than during the levels 1 and 0:?: thanks in advance If we are talking about cmos logic: A high voltage on the gates will cause the nMOSFET to conduct and the pMOSFET not to conduct while a low voltage on the gates causes the rev

Clamp Diode on High Speed Lines

Hi, Can I use Diode termination (Diode clamping) on a high speed cmos line ? Speed of this line will be 250MHz. What will be the impact on the signal speed & switching ? Secondly are there any other impacts such as power dissipation by the Diode on the clamp source voltage and radiation ? I have attached the clamping diagram for (...)

can this cmos circuit operate??

Hi, what is the high level of IN , is it VDD or 2xVDD? Is the center of the two inverter fixed (connected) to a VDD supply (like in your picture)? regards

TSMC 0.18 um HV (32V) CMOS minimum pad size and pitch?

Hi friends, I'm considering using TSMC 0.18 high voltage (32V) cmos process for my project with high voltage transistors connected to I/O pads. Can anyone let me know what the minimum pad size is and pad pitch is? I currently don't have the design manual. Thanks, jts

Why we use max 232 ic

Due to the fact the RS-232 interface has relatively high voltage levels in relation to TTL levels. Also the voltage levels are both positive and negative. A RS-232 transceiver, like the MAX232, is required to translate these levels to TTL/cmos. Wiki - RS-232 The RS-232 standard defines the