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Differential Pair

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what is the benefit of differential Output of Max-485

RS-485 and RS-422 use differential output with twisted pair of wires for distance improvement (up to 4k ft) , at the end of the cable there is a differential receiver (op amp) , for a long cable ,unwanted noise and power coupling is generated . but it will be the same for both twisted pair .the Rx op amp will get rid of the (...)

output current of differential pair (Transconductor)

Hello every one I want to calculate output current of differential pair circuit which is used as a OTA, but I could not obtain. I attached the related paper which claims From eq. (2)-(4) we can obtain the output current of eq. (5), unfortunately I could not obtain the result which they achieved. I attached the paper. Please help me to know

common mode rejection ratio (CMRR)

Driving (+) with (-)=0V gives a differential gain of 1 + 1million (GBW) so it is correct. It is often done with voltage divider to lower Source resistance near zero to reduce noise. ie. 1M to 1Ohm divider with 10V gives 10uV source. Then iput offset current * R =0

Difference between Single ended clock and Differential clock

differential clock consist of SYSCLK_P and SYSCLK_N are connected to a differential clock oscillator. differential Signaling is not sensitive to SSO noise. A differential receiver is tolerant of its ground moving around. If each “wire” of pair is on close proximity of one and other. (...)

Most RS458 transmitters can drive 32 receivers so there shouldn't be any problem. Yes, you should have terminating resistors, at least at the most remote end and you should be using a balanced cable, preferably a twisted pair of wires. You should still also have a ground connection between the two ends, although the signal is differential if you o

differential Pair crosstalk

I want to do analysis crosstalk on 3 differential pairs, I m bit confused in s-parameter extaraction verify the result, If anybody gone through this kind of simulation pls help me out.

input offset voltage

Hi ed_gops, the delta(W/L) and delta(Vth) are random variables. Due to random physical effects during manufacturing, such as random dopant fluctuation (RDF) and line edge roughness (LER), every transistor has a slightly different Vth and L than its neighbors. This difference causes offset in a differential pair. The formula in your picture calcula

Hi everyone, I'm designing an injection-locked LC-VCO with f0=2GHz. The circuit is shown bellow, this is a PMOS-NMOS crossed coupled LC-VCO, the injected signal Vij is put through M1/M2 differential pair. The Vij comes form a LNA in the previous part and a capacitor is in between the LNA and the VCO. I have some questions: (1) The coupled cap

common mode gain of cmos differential amplifier with current mirror load

I know that it is approximately zero. Can anyone help me how it become zero from small signal analysis. What is the final gain equation from small signal analysis?

How to deisgn sizes of differential amp in spectre

Hi, To desiogn an op-Amp you must design proper biasing ciruits which is essential for the proper operation... For current mirror you have to find appropriate length which makes good mirroring of current... And it depends on which technology you are using.... Then choose somewhat bigger area for the differential input pair of the Op-Amp , this b

standard difference signal lines in PCB layout

Hi, i wanted to ask how are the standard difference signal lines rules when drawing differential lines in PCB layout? (please help, i need this as soon as it can be)

How to route two matching signals in Encounter?

Hi everyone, In my design, I have some special pairs of wires. The two signals in each pair should be totally matching with each other, having the same transmission delay like "differential signals". Is there any commands that I could use as timing constraint or routing options in Encounter? Thanks

HIgh Gm and high rout amplifier

Hello, Please I want to ask how to design an amplifier " transconductance Gm" with high Gm of 30m and high output resistance of 100K at the same time , I used folded casocde amplifier to satisfy high output resistance but because it was designed to be with high Gm , the current in the differential pair transiator and the source transitor is v

Hi, Advantages of inter-digitization gives each finger of the gate the same effects. Keep in mind that you must add spares onto the end so that the end finger "sees" the same as a finger in the middle of the row. Keeping the inputs of a differential pair the same length in also expected. The disadvantages of inter-digitization is that for high sp

Actively loaded differential pair - need help with simulation results

Hi, Below is the schematic with which I need help. 96190 I want to calculate the following parameters using Spectre but am not sure how to go about doing it- 1.) Input common mode range 2.) Output resistance 3.) differential gain 4.) Unity gain frequency 5.) Input referred thermal noise at 1 MHz Transistors

[MOVED] PMOS differential amplifiers

hi, You can simply use CS pair to improve the gain which is connected to ech outputs of differential pair... Still you need more gain means, use cascode pair......... Thanks

Ethernet differential pair routing

Hi, Here are my suggestions to route ethernet signals. I assume the interface speed is 100Mbps: 1. Keep the distance between PHY chip and Ethernet Transformer (magnetics) as short as possible. 2. Route the RX+, RX-, TX+ and TX- differential pairs as 100ohm differential characteristic impedance. You can use Saturn PCB tool kit (a free (...)

USB communication differential signaling

Hi Peter, USB requires a shielded cable containing 4 wires. Two of these, D+ and D-, form a twisted pair responsible for carrying a differential data signal, as well as some single-ended signal states. (For low speed the data lines may not be twisted.) The signals on these two wires are referenced to the (third) GND wire. The fourth wir

corner case and noise in hspice

I have a simple differential pair in hspice. I want to perform corner case and noise analysis. what shoul I do? in below you can see netlist: VCC 11 0 DC 5 VDD 12 0 DC -5 vb 4 0 1 M1 3 1 5 5 NMOS1 w=20u l=.5u M2 3 7 5 5 NMOS1 w=20u l=.5u M3 11 4 3 3 NMOS1 w=5u l=.1u R1 5 12 7k .MODEL NMOS1 Nmos level=2

differential pair signals

Not sure what your question is. Are you asking how to route differential pairs?