A circuit or sub-circuit that as accurately as possible preserves the voltage characteristics of a signal while providing additional current. Typically used in situations where a circuit cannot drive the load that is presented to it.

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44 views

What would be the simpliest buffer amplifier design in this situation?

Take a look at this schematic: It is important to assume that we have the following constrains: 1) Load is connected to ground, therefore it requires a positive potential to activate 2) The ...
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1answer
23 views

Current sourcing octal buffer/line-driver for 7+1 segment LED multiplexing?

I would like to multiplex 8, 7-segment LED displays with two, 8-bit shift-registers. The required current for one segment is 20mA. I have no desire to overdrive the ...
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2answers
57 views

Understanding to isolating sensor input capacitance

The circuit given above is pH sensor buffer circuit, picture taken from here. This circuit have pH sensor input and gives an output that can be read by multimeter which is U2's OUT_ pin . U1 is here ...
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1answer
23 views

Why is a Buffer+RC-combination recommended for driving a SAR ADC analog input?

In various places, e.g. this tutorial video by ti, a circuit like the following is being recommended to drive the analog input of a SAR A/D converter: simulate this circuit – Schematic ...
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1answer
59 views

Having the same source for power supply and positive input for a single-supply buffer amplifier

I am new on designing power management for circuits. simulate this circuit – Schematic created using CircuitLab I want to design a circuit to stabilize the 12v power input. I have a ...
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1answer
20 views

Interfacing 6116 RAM to a data bus

I have a question about interfacing IDT6116SA15TPG SRAM to a tri-state data bus controlled by 74LS244 tri-state buffer. I could not find an old memory like 74LS289 with separated inputs and outputs. ...
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1answer
48 views

Triode preamp with TL072 phase inverter buffer?

Wondering if anyone can advise on this tube triode (12ax7) preamp stage followed by an Op Amp buffer stage to correct the inverted signal. I wired it up and did not work. Before tho, I wired it with ...
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1answer
56 views

How to implement a double buffer using an ARM Cortex M3

I am a total beginner, but I have been working on a project to attempt to build my own microcontroller that outputs basic 2D graphics to an LCD screen. In doing some research as to how this is ...
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2answers
50 views

FRDM-kl25z Serial Buffer Issue

I'm sending data over Serial to a FRDM-kl25z via a printf statement on another uC; ...
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1answer
32 views

clock drivers low current consumption

I am trying to drive a 30 pF load cap (1 pF times 30 or 2pF times 15 or so on) from a ring oscillator generated clock. The frequency I want is 250 Mhz. What is the best approach to keep the input ...
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3answers
45 views

Bi-directional logic level conversion

I'm trying to design an accelerated CPU (65816) for the Apple IIGS by using a high speed ARM processor combined with a software emulator + software emulated cache. The CPU I'm using is the LPC4300 ...
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2answers
258 views

Inverting buffer with op-amps

I know that it's easy to make a unity gain buffer with an op-amp (as a voltage follower): simulate this circuit – Schematic created using CircuitLab I also know that it's easy to make an ...
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2answers
79 views

Buffering/matching large signal to drive 5 ohm capacitive load at 13MHz (RF)

I built a Pierce oscillator that generates 13.5MHz @ 7Vpp signal from a V_cc=12V. But I need to drive a capacitive load of 5 ohms @ 6Vpp. I'm not sure how to do this. First I need a buffer to prevent ...
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1answer
120 views

VHDL How to Design a Screen (Frame) Buffer

I am trying to use a screen buffer to store, change and output the bits of a video data to the DVI transmit interface. I am using Altera Cyclone III development kit. I will be using 1440x900@60Hz ...
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2answers
68 views

Interfacing tri-state logic across 3v3/5v. Do buffers mirror all three logic states?

(This is just learning/hobby stuff...) I have a 5v (tri-state TTL, ZX Spectrum) bus and I want to interface some non-5v tolerant 3v3 chips to it. I think I need buffers or transceivers for the level ...
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1answer
61 views

74HCT245 buffer IC

In 74HCT245 bidirectional buffer IC, 3rd state is high impedance state as shown below. Link for datasheet: http://www.nxp.com/documents/data_sheet/74HC_HCT245.pdf If we want 3rd state as "Latch" ( ...
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0answers
25 views

Basic gate using transmission gate [duplicate]

How can we design the basic gates and universal gates using the transmission gate.
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1answer
121 views

Buffer circuit explanation

I just saw this question and was wondering how this circuit actually works, since I couldn't really figure it out, I though about asking it. This is the circuit I am talking about: Lets label ...
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1answer
42 views

Buffer amplifier

I have a buffer amplifier that is single supply 0-10v Lets say I give it an input (sine wave 0-10v Vpk-pk) and added a dc level-shifter to shift the input signal up by 0.5v (0.5v-10.5v sine wave ...
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1answer
88 views

Buffer Capacitors [duplicate]

What does a buffer do? In the given circuit,it is said that capacitors C1 and C4 act as buffer .What is their role here?Can't we just replace them with pull-down resisrors?
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1answer
112 views

Microcontroller circuit

I am using a Stellaris EK-LM4F120XL for a project. The project includes an LCD module, servo motor, ultrasonic ranger and a numpad. The LCD, servo and ranger are rated at 5V operating voltage, and the ...
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0answers
69 views

Buffer amplifier used in medical implant hearing aids

I am new here, so if I am posting in the wrong area, please let me know. Recently at the university I've had a guest lecturer, that works at Cochlear developing medical implant for the hearing ...
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2answers
128 views

Buffer management for SD card in SPI mode

I'm looking into implementing storage of large audio files onto an SD card. I'll be using SPI to access the card to avoid any patents by the SD card mafia. I'll be generating a lot of data, about ...
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1answer
214 views

OV7670 frames are 640x308 not 640x480

There is a lot of helpful information on the internet about getting the OV7670 camera up and running but the following problem has me a bit stumped. I am using a Maple r5 Board (STM32F103RBT6) to ...
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1answer
107 views

Floating a digital output pin of an IC

I'm using a FXLS8471Q accelerometer for a project using the SPI interface. The chip uses the same pins for SPI and I2C. To detect which interface the user desires, the chip samples the SA0 pin on ...
2
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1answer
139 views

LTSpice Level 2 Simulation CMOS follower

I'm trying to make a level 2 simulation of a voltage buffer made by a CMOS circuit: For this, I have been told to use level 2 CNM25 technology Spice models for the transistors, and I have been ...
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4answers
1k views

Turn TTL output of logic IC into output capable of driving 50 ohm devices

I want to provide front-panel trigger signals with the microcontroller inside my device. The trigger signal will be fed via a 50 ohm coax cable to another device with a 50 ohm input. A direct ...
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2answers
3k views

What are buffer and latches in microprocessor?

I would like a description that clarifies the concepts of what buffers and latches are and the difference between them. I'm asking for buffers and latches in respect to the 8086 microprocessor.
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1answer
114 views

Is it safe to use a bus buffer as level shifter?

I am currently using SN74ABT5402ADW as a buffer and level shifter for my ADC, however, the datasheet does not explicitly say that it can be used as a level shifter. I provide it with 5V power, but the ...
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1answer
570 views

Understanding this statement in ATmega328P's datasheet

While reading ATmega328P's datasheet, I came across the following statement. The Port X output buffers have symmetrical drive characteristics with both high sink and source capability. What does ...
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1answer
232 views

Differential ADC input buffer

I am trying to make 10Mohm of input impedance into a ADC (CS5530). I am planing to use differential input buffer to ADC so I am trying to use TI's document as reference. I tried the one differential ...
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2answers
909 views

Battery Voltage Sensing Circuit (Voltage divider, buffer)

I've been trying to figure out a quick and easy circuit for sensing a battery's voltage, then translating that voltage to an 0-5v signal that could be read by a microcontroller like an Arduino. My ...
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3answers
208 views

Problem with ADC of Atmega16A in differential mode

I am having some problem while using ADC interface of Atmega16A. I want to calculate RMS voltage of the power supply coming to my house(usually 250V, 50Hz) and display it on LCD. I am using the ...
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2answers
103 views

Arduino + LS7407N to shift logic levels in serial communication

I'm trying to drive a device that uses 12-0V levels for serial communication. I decided to use LS7407N, a buffer with open-collector, so that I can use Arduino's TTL levels to send commands to the ...
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5answers
183 views

Resistive loading effect voltage drop

I have been working on a project that is supplied by 8.4v battery. I then used the 7805 voltage regulator to get 5v and supply the electronics. Later, I figured out that I need to have 3.3v along ...
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1answer
144 views

Operation amplifier concept problem

I'm new to op amps and I'm trying to grasp the concepts. Starting with a simple op amp buffer, with the output connected to the inverted input. One rule states that the op amp tries to keep the inputs ...
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0answers
242 views

Can't read the SPI buffer of a PIC32MX

I have some problems with my SPI communication. Indeed, I have configurated the PIC32 as master, and it communicates with a slave which is a memory. The communication works perfectly. LEGEND : In ...
4
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1answer
252 views

Why would this logic gate use negative voltages?

I'm reading a data sheet for a hex buffer with enable- a pretty simple logic DIP. Here's the logic diagram and pin assignment: This all makes sense to me until I look at the electrical parameters. ...
3
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2answers
430 views

Why we gradually increase size of inverters in buffer design?

When trying to drive a high capacitive load why do we gradually increase size of inverters in buffer design. Why not give the output of a circuit to one large inverter?
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0answers
98 views

Looking for tri-state buffer driver/receiver

I'm trying to build a circuit with multiple client MCUs and one server MCU. They are all connected through a common bus. The bus contains 5 lines (Power, Ground, TX, RX and Control Signal). The ...
3
votes
1answer
74 views

Help to understand output levels of clock buffer

I'm dealing with clock buffer and trying to determine how output levels depends on the input. I'm using information from the datasheet. Here is the table with information: I don't understand the ...
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2answers
113 views

Signal distribution, buffers, rise times and EMC

I am designing a DSP based audio mixer. There are 4 AD/DA converters (AD1939 and AD1974) and a DSP (OMAP L138), which is on a carrier module. I am distributing the frame clock (48kHz) and the bit ...
4
votes
1answer
153 views

Distributing a 40MHz clock to several PCBs

I need to run four PCBs with a very accurately synchronised clock. The source clock is 40MHz, but each PCB contains a 1GHz PLL, and will be timing events in the analogue domain with a final ...
1
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1answer
92 views

Capacitor with op-amp

if we connect a capacitor with charge = 5 volts , with buffer (op-amp) , will the capacitor will discharge it's voltage ? or because of high impedance will keep it's charge ? simulate this ...
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2answers
196 views

Extremely noisy signal after voltage follower/buffer [closed]

I am trying to create a voltage follower for my CCD linear array. When I measure the signal with oscilloscope directly from the CCD outptut - the signal is reasonably clean. However, when I measure if ...
1
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1answer
129 views

protecting a sensor component from high spikes when switching power on

I have an electrical scooter which has a "Hall Effect Sensor" in the handle-bar, measuring the magnetic flux to determine the amount of "gas" or gauge. This sensor tends to burn out quite frequently. ...
0
votes
1answer
62 views

In a tristate buffer which transition time should be larger

I was having a doubt related to tristate buffers. I know that a tristate buffer allows an output port to assume a high impedance state in addition to the 0 and 1 logic levels, effectively removing the ...
3
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2answers
212 views

Buffering AC supply voltage and detect power loss?

I'm designing a system integrating: an industrial PC with 230V AC input (~300W) various peripherals requiring 24V DC (150W max) In case of external AC power loss, the DC components (2) need to be ...
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1answer
1k views

Difference between a n bit Latch and a buffer

What is the difference between a 8 bit buffer and a 8 bit latch? Are they both used for the same purpose? The 74LS273, is a buffer or a latch?
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1answer
242 views

Is Propagation Delay affected by signal frequency?

I'm using some line drivers(lvds) on a project and I have two signals that are propagating consistently differently. Signal A is about ~71Mhz and arrives consistently slower than Signal B which is on ...