Questions tagged [differential]
Differential refers to any kind of signaling where the signal information is carried by two or more paths and both are required to properly reconstruct the signal. For example, USB D+ and D-
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How to Derive Gain Equations for a Balanced Differential Variable Gain BJT Amplifier with Small-Signal Model?
I'm working on analyzing a balanced differential amplifier using two matched NPN BJTs (β=100). The circuit has differential (Vd/2) and common-mode (Vcm) inputs, with resistor RG (potentiometer) and RE ...
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Interference-free communication with 3 lines between two boards
Initial situation:
I have a master board with a microcontroller that takes over the
control.
An external I/O board is to be connected, which should:
receive 7 digital outputs from the master
report ...
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Do I need to match impedance for short, USB 2.0 full-speed traces with different lengths?
I'm designing a board that uses a CP2102 to convert USB to TTL. This chip has its D+ and D- terminals "crossed" compared to the standard micro USB connector. See below:
To solve this, I ...
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Altium - enumeration(?) for net labels when number in in middle of net name
When making net labels with the same name "function" I will separate them with a number in the end. (RX_OUT_P1, RX_OUT_P2, etc) This is for normal signals not a problem, because altium ...
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Charging time of a capacitor for a differential RC configuration
The charging time constant for an RC circuit as follows is tc=R*C.
But how to calculate the charging time of capacitor in the following circuit where the capacitor is connected to a differential ...
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STM32 ADC and Comparator Interference
I have 3 wire, 3-phase system which I am trying to monitor with an STM32G473CET6 which has Differential ADCs and built in comparators.
I am using voltage dividers between the phases to measure L-L ...
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Handling of driver interface pins
I am currently working with the IL4822 IC (datasheet) and have some questions regarding the handling of its bus driver/receiver pins.
Pins 11 and 12 function as the non-inverting bus driver/receiver.
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Confused by differential input signal on ADC
Reading the PCM4222 ADC datasheet, it includes two analog inputs, and each channel includes a pair of differential voltage input pins. Each pin of an input pair has a nominal full scale input of 2....
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Analysing a low level differential amplifier circuit
I am trying to analyse this circuit. I physically connected this circuit to a strain gauge and amplified strain gauge output. When the input was 6mV from strain gauge the output is 1.12V suggesting a ...
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RF transformer connections
I have a question regarding a schematic I was looking at the other day.
simulate this circuit – Schematic created using CircuitLab
So what the schematic shows is that they are separating the ...
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Non transient physical homogenous solutions?
In the context of RLC, LC, and RC circuits, which are typically modeled by second-order differential equations, the homogeneous solutions usually exhibit exponential decay, consistent with energy ...
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Glitches on differential signal pairs
My question is about the glitch-avoiding problem in general, not just USB data pair. I'm asking how do I do the clocking and sampling.
I'm reading about USB and have a question about how we avoid ...
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Is this design enough for USB 2.0 full speed?
I am designing a PCB that uses an USB Type-C that is configured to work at full speed USB 2.0. I am not sure how am I supposed to route the D+ and D- pins of the differential pair. Could I just route ...
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Buffer / Connector Topology for Daisy Chained SPI Signal Between PCBs
I'm working on a project where I need to control a large number of shift register outputs updated at 44.1kHz audio rate. I built a board in the past that worked well for controlling 64 outputs (8 ...
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Long differential pair into balanced antenna
If I understand correctly, a differential PCB trace pair feeding a balanced antenna will not radiate much. Of course, there will be no ground plane above or below the diff pair. So then the antenna's ...
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