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Sample and Hold Circuits
Last Updated on:
Sunday, August 23, 2015 08:20 AM


Circuits Designed by Dave Johnson, P.E. :
  • AIR TRANSPARENCY MONITOR, XENON FLASH RECEIVER
    I designed this circuit many years ago to monitor the quality of a mile long column of air for future optical communications experiments. The transmitter system (circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch Fresnel lens at the transmitter end and a matching 12-inch lens with a PIN photo diode at the receiver. The receiver system was connected to a weather station and a computer to collect the changes in intensity of the light flashes under different weather conditions. It has the potential for a 30+-mile range. I have also used this system to conduct cloud bounce experiments.


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

4 Sample/Holds on a Chip with 1-µs max Acquisition Time -  Scroll to find this circuit… [Analog Devices-Analog Dialogue by Fluke, Brad and Predella, Pete]

A Pair of 16-Bit-Performance Sample-Hold Amplifiers -  PDF contains several designs, scroll to find this one… [Analog Devices-Analog Dialogue by Predella, Pete]

AN-266: Circuit Applications of Sample-Hold Amplifiers -  National Semiconductor Application Note…

AN-270: Applying IC Sample & Hold Amplifiers -  AN-270 Analog Devices App Note - …

AN-284: Implement Infinite Sample-and-Hold Circuits using Analog Input/Output Ports -  AN-284 Analog Devices App Note - …

 

AN-294: Special Sample & Hold Techniques -  National Semiconductor Application Note…

Asynchronous Sample-Rate Converters -  Analog Devices-Analog Dialogue… [by Adams, Bob]

Calibrate scope jitter using a transmission-line loop -  09/20/01  EDN Design Idea   Digital-clock-period jitter is the variation in the period of a clock cycle compared with a nominal (average of many cycles] clock period. To accurately measure period jitter using an oscilloscope, you must subtract the oscilloscope… [by David Cuthbert, Micron Technology, Boise, ID]

Capacitor Improves Sample-and-Hold Circuit -  Scroll to find this circuit… [Analog Devices-Analog Dialogue by Giles, J.N.]

Circuit Applications of Sample-Hold Amplifiers -  National Semiconductor Application Note…

Circuit improves on temperature measurement -  05/02/02  EDN Design Idea   When current pulses with a stable IHIGH/ILOW ratio modulate a semiconductor junction, the ensuing voltage difference (for example, ΔVBE for a bipolar transistor] is a linear function of the absolute (Kelvin] temperature, T. You can us… [by Alexander Bell, Infosoft International Inc, Rego Park, NY]

Circuit Lets You Test Sample-And-Hold Amplifiers -  03/04/10  EDN Design Idea   Measure voltage drop with a digital voltmeter… [by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

Circuit Level-Shifts AC Signals -  10-Jul-03 EDN Design Idea   AC signals can emanate from many sources, and many of these sources are incompatible with the most popular interface voltages, such as TTL. A temptation always exists to capacitively couple the ac signals because capacitive couplin… [by Ron Mancini, Texas Instruments, Bushnell, FL]

Diagnose setup and hold times in synchronous and asynchronous circuits -  10/18/07  EDN Design Idea   Metastability of digital circuits can become a problem if you don't properly account for setup and hold times in synchronous circuits, or at random in the case of asynchronous inputs… [by Staff]

Dual-Input Sample-And-Hold Amplifier Uses No External Resistors -  12/14/07  EDN Design Idea   A sample-and-hold Amplifier sums two inputs and holds that sum when triggered… [by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

Flash Converters Work Better with Track/Holds -  File contains several designs, please scroll to find this circuit.… [Analog Devices-Analog Dialogue by Neal, Jerry and Surber, Jim]

Frequency to Voltage Converter uses Sample & Hold to Improve Response & Ripple -  National Semiconductor App Note - , 28-Jun-1996…

Frequency-to-Voltage Converter uses Sample-and-Hold to Improve Response & Ripple -  National Semiconductor Application Note…

Gain-of-three Amplifier requires no external resistors -  11/08/07  EDN Design Idea   If the required voltage gain of a sample-and-hold Amplifier is an integer, this circuit achieves a gain of two without using any power-dissipating external resistors… [by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

Gain-of-two sample-and-hold Amplifier uses no external resistors -  11/08/07  EDN Design Idea   TWhen you need to simultaneously sample a signal and Amplify the signal level, you can cascade a common gain-of-one sample-and-hold Amplifier and an Amplifier with a voltage gain of one. With some exceptions, such an Amplifier has two external resistors (Reference 1). These resistors dissipate power even at the steady state of the sample-and-hold Amplifier. In monolithic ICs, power dissipation and the consequent generation of heat from resistors are not the only items in the list of the drawbacks of external resistors.… [by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

High IF Sampling Receiver Front End with Band-Pass Filter  -  The modified AD9642-250EBZ board contains the circuit evaluated as described in this note, and the HSC-ADC-EVALCZ data capture board is used in conjunction with VisualAnalog® evaluation software, as well as the SPI Controller software to properly control the ADC and capture the data. Application Note AN-835 contains complete details on how to set up the hardware and software to run the tests described in this circuit note. … [Analog Devices-Circuits from the Lab]

High Performance, Dual Channel IF Sampling Receiver  -  A loop filter, designed with the ADISimCLK? simulation software, provides a 60 kHz cutoff frequency and 50° of phase margin, giving timing jitter of about 160 fs rms. … [Analog Devices-Circuits from the Lab]

Improve On Temperature Measurement -  05/02/02  EDN Design Idea   When current pulses with a stable IHIGH/ILOW ratio modulate a semiconductor junction, the ensuing voltage difference (for example, ΔVBE for a bipolar transistor] is a linear function of the absolute (Kelvin] temperature, T. You can us… [by Alexander Bell, Infosoft International Inc, Rego Park, NY]

Infinite-Hold Circuit Zeros Out Long-Term Drift -  03/03/94 EDN Access-Design Idea   The infinite-hold circuit in Fig 1 automatically zeros out long-term drift from an instrument or a sensor. In operation, a control system (not shown]periodically takes the instrument or sensor off line and applies a known s… [by William R Penrose and Li Pan, Transducer Research, Naperville, IL]

Inverting sample-and-hold Amplifier requires no external resistors -  08/02/07  EDN Design Idea   Eliminating external feedback resistors in an inverting sample-and-hold amplifier allows it to exploit the full bandwidth of its op Amps… [by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

LB-45: Linear Brief 45 Frequency-to-Voltage Converter uses Sample-and-Hold to Improve Response & Ripple -  National Semiconductor Application Note…

Level-Shifts AC Signals -  10-Jul-03 EDN Design Idea   AC signals can emanate from many sources, and many of these sources are incompatible with the most popular interface voltages, such as TTL. A temptation always exists to capacitively couple the ac signals because capacitive couplin… [by Ron Mancini, Texas Instruments, Bushnell, FL]

Low Cost Sample/ Hold Includes Two ICs -  Maxim App Note - / 19 / Apr-07) …

Monolithic Sample-Hold Amplifiers -  Analog Devices-Analog Dialogue… [by Kress, Dave and Wagnor, Dick]

Monolithic Sample-Hold Is Complete, Fast, Accurate -  File contains several designs, please scroll to find this circuit.… [Analog Devices-Analog Dialogue by Croteau, John]

NCO technique helps µC produce clean analog signals -  04/15/99 EDN Design Idea (contains several designs, scroll to find this one)   A recent Design Idea described a method for producing an analog voltage from one digital output of a µC ("Generate an analog signal with a µC," EDN,Oct 22, 1998, pg 108). The method involves generating a PWM output with a controlled duty cycle and filtering the switching waveform with a simple single-pole RC filter. Although this method provides an accurate dc output with 8 bits of resolution, it requires a filter with a low cutoff frequency to reduce the ripple to less than 1 LSB. … [by Steve Ploss, Veridian Corp, Wright Patterson AFB, OH]

Precision Sample and Hold Amplifier -  CMOS Amplifiers are very good for use in Sample-and-Hold circuits because the pA's of bias current does not drain off charge held on the hold capacitor. A dual Amplifier can be used to buffer the input signal and also the hold capacitor. The slew rate of the circuit is limited by the output current limit of the input Amplifier charging the 0.1uF hold capacitor… [Linear Technology App Note - , Mar 16, 2010]

Precision T/H Amplifier Uses 3.3V Supply -  06/22/95 EDN Design Idea   The track-and-hold (T/H] circuit in Fig 1works well in applications using a low-voltage single supply, such as in battery-powered designs. Despite the low supply voltage, output-signal dynamic range remains high thanks to the ra… [by John McDonald, Analog Devices, Santa Clara, CA]

Resistance Measurement Using Sample and Hold Method -  A sample and hold circuit, as the name implies, samples an analogue input signal and holds its value until the input is again sampled. … [© EFY Enterprises Pvt. Ltd. All rights reserved.]

RF transmitter uses AMI encoding -  11/24/99 EDN Design Idea   Although alternate-mark-inversion (AMI]encoding is well-suited for direct-conversion FM transmission, designers often overlook the technique. AMI, a three-phase, synchronous-encoding technique, uses bipolar pulses to represent log… [by Paul Sofianos]

S/H circuit minimizes aperture -  04/15/99 EDN Design Idea   (contains several designs, scroll to find this one)  Conventional sample-and-hold (S/H) circuits use one hold capacitor that charges during the track phase and disconnects during the hold phase. The voltage that the capacitor holds usually drives an A/D converter that operates synchronously with the S/H control signal. This approach can sometimes place excessive demands on the S/H circuit's bandwidth and settling capabilities. You can improve performance by using two hold capacitors to implement continuous sampling (Figure 1). One capacitor or the other is always sampling the input signal, and the output is always the held value. A phase-reversal switch (IC1) interconnects the input, output, and hold capacitors. … [by John Guy, Maxim Integrated Products, Sunnyvale, CA]

Sample/ Hold Includes Two ICs -  Maxim App Note - / 19 / Apr-07) …

Sample/Arbitrary Hold -  Analog Devices-Analog Dialogue… [by Craven, Bob]

Sampling peak detector has shutdown feature -  05/16/02  EDN Design Idea   You face a serious problem in using a slow ADC with a fast peak detector. The circuit in Figure 1 allows a slow ADC to measure a fast, sampled signal peak. The 100-MHz peak detector for ultrasonic-pulse sampling uses a fast MAX4231… [by Shyam Tiwari, Sensors Technology Private Ltd, Gwalior, India]

Signal Is Sampled and Held for 1 Minute -  Analog Devices-Analog Dialogue… [by De Perna, Richard]

Special Sample & Hold Techniques -  National Semiconductor Application Note…

Test Sample-And-Hold Amplifiers -  03/04/10  EDN Design Idea   Measure voltage drop with a digital voltmeter… [by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

Understanding Sample-Hold Modules -  Analog Devices-Analog Dialogue… [by Sanchez, Albert]

Use Analog I/O Ports as High-Performance Infinite Sample/Holds and Peak Followers -  Analog Devices-Analog Dialogue… [by Curtin, Mike and O'Grady, Albert]

Video Design Idea: Diagnose setup and hold times in synchronous and asynchronous circuits -  10/18/07  EDN Design Idea   Metastability of digital circuits can become a problem if you don't properly account for setup and hold times in synchronous circuits, or at random in the case of asynchronous inputs… [by Staff]

Sample & Hold Circuits


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