Any significant differen in these CMOS XOR gates?
2021年6月23日 · Interesting but i can't find an arrangement that works in all cases. E.g., on the bottom half, swap A' with B, but now for the inputs 00 and 11, the XOR output line is always "disconnected" from Vdd and Vss. I think this is dangerous and ambiguous to leave it floating. It should be driven by the Vss to a low voltage.
CMOS logic Gates XOR - Electrical Engineering Stack Exchange
2017年9月8日 · In practice a CMOS buffer is made from two inverters, so the answer given is the simplest combination of 'elementary' gates. And why does the second inverter need to be active low? The negation would be equally valid on the output, but having it on the input shows that the signal is 'active low' at this point.
transistors - Minimalist 3-input XOR gate using CMOS - Electrical ...
2024年2月19日 · As an enthusiastic noob to CMOS I browsed multiple examples of XOR gates using PMOS and NMOS. I find it hard to find any good examples of 3-input XOR gates; I found an example of a 4 FET 2-input XOR that boosts the signal …
12 transistor XOR CMOS gate - Electrical Engineering Stack …
2023年11月11日 · The inverter in the middle is operational, and drives the output to be "not B" — i.e., B XOR 1. If A is low, then the inverter in the middle does not work, but the transmission gate connects B directly to the output — i.e., B XOR 0. And just for completeness, the standard CMOS 12-transistor XOR gate looks like this: source
transistors - Why is this CMOS implementation of XOR wrong ...
2023年2月27日 · This is why the actual given CMOS XOR is so complex. It needs to function with only PMOS transistors in the top half and NMOS transistors in the bottom half. If you do a similar analysis to what I've done here, with the circuit you were given, you'll see that it meets all of the necessary criteria.
digital logic - XOR gate; transistor level design - Electrical ...
\$\begingroup\$ In NMOS technology, if one needs an XOR gate and the inputs come from logic that isn't driving anything else, one could get by with two transistors and one passive pull-up: simply connect the drains of the two transistors to the pull-up, connect A to the source of one and gate of the other, and B to the remaining source and drain.
digital logic - 3-input XOR gate truth table - Electrical Engineering ...
2021年7月4日 · If you treat inputs as the sign of a number, where the "0" input corresponds to a positive sign, and a "1" corresponds to a negative sign, then the XOR function operates as a multiplier. And if you reverse the logical assignment (logic "0" corresponds to -ve sign, and logic "1" corresponds to a +ve sign), that works too.
Simplifying CMOS schematic to reduce number of transistors
2014年11月11日 · I know the basics in creating a schematic in CMOS, wherein in a(n inverted) boolean expression, if there is a: NOR - NMOS should be in parallel, PMOS in series; NAND - NMOS in series, PMOS in parallel. Recently, we were tasked to do the CMOS equivalent schematic of an XOR gate.
What is wrong with this XOR gate built with four transistors?
2016年9月9日 · I try to undestand how to build an XOR gate using discrete transistors. I checked this question with an extensive answer. Howerver the xor gate there and also on Wikipedia seems needlessly complicated. I simulated the following circuit in Logisim and it seems to work. It is based on the idea that input B switches between A and not A.
3 transistor XOR gate - Electrical Engineering Stack Exchange
2024年2月16日 · Implementing bipolar transistors resistors and diodes on a CMOS process is not area efficient you will probably find that this takes more silicon area than a conventional xor made from FETs. Below is a 10 transistor 'conventional' xor, note and1 and nor1 are a combined 6 transistor and-nor gate, your and gate alone is 6 transistors.