Sample and Hold Electronic Circuits

Sample and Hold Circuits
Last Updated on: Friday, October 16, 2009 03:42 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:

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. ….(designed by David A. Johnson)

Air Transparency Monitor, Xenon Flash Receiver, Page 2 - This is Page 2 of the receiver circuit AIR TRANSPARENCY MONITOR, XENON FLASH RECEIVER ….(designed by David A. Johnson)

AN-266: Circuit Applications of Sample-Hold Amplifiers - National Semiconductor Application Note (app note added 2/06)

AN-270: Applying IC Sample & Hold Amplifiers - AN-270 Analog Devices Application Notes (app note added 6/06)

AN-284: Implement Infinite Sample-and-Hold Circuits using Analog Input/Output Ports - AN-284 Analog Devices Application Notes (app note added 6/06)

AN-294: Special Sample & Hold Techniques - National Semiconductor Application Note (app note added 2/06)

Calibrate scope jitter using a Transmission line loop - 09/20/01 EDN-Design Ideas: Digital-clock-period jitter is variation in 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 oscilloscope jitter from measured jitter. However, oscilloscopes rarely have a jitter specification, so you must determine oscilloscope jitter.....(design idea added 1/05)

Circuit Applications of Sample-Hold Amplifiers - National Semiconductor Application Note (app note added 2/06)

Circuit improves on temperature measurement - 05/02/02 EDN-Design Ideas: 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 use this truism to make accurate temperature measurements. Technical literature has thoroughly covered the.....(design idea added 10/03)

Diagnose setup & hold times in synchronous & asynchronous circuits - (Video Design Ideas- EDN, 10/18/07) -- 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. (electronic design idea added 9/08)

Dual input sample & hold Amplifier uses no external resistors - 12/14/07 EDN-Design Ideas: A sample-and-hold amplifier sums two inputs and holds that sum when triggered.....(design idea added 9/08)

Frequency to Voltage Converter uses Sample & Hold to Improve Response & Ripple - National Semiconductor Application Notes,28-Jun-1996 (app note added 6/06)

Frequency-to-Voltage Converter uses Sample-and-Hold to Improve Response & Ripple - National Semiconductor Application Note (app note added 2/06)

Gain of two sample & hold Amplifier uses no external resistors - 11/08/07 EDN-Design Ideas: 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.....(design idea added 9/08)

Infinite Hold Circuit Zeros Out Long Term Drift - 03/03/94 EDN-Design Ideas: 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 stimulus. The known stimulus generates a baseline-output signal.....(design idea added 3/03)

Inverting sample & hold Amplifier requires no external resistors - 08/02/07 EDN-Design Ideas: Eliminating external feedback resistors in an inverting sample-and-hold amplifier allows it to exploit the full bandwidth of its op amps.....(design idea added 09/07)

LB-45: Linear Brief 45 Frequency-to-Voltage Converter uses Sample-and-Hold to Improve Response & Ripple - National Semiconductor Application Note (app note added 2/06)

Low Cost Sample/ Hold Includes Two ICs - Maxim Application Notes / 19 / Apr-07) (app note added 5/08)

NCO technique helps µC produce clean analog signals - 04/15/99 EDN-Design Ideas:.....(design idea added 8/03) NCO technique helps C produce clean analog signals. C generates musical sounds. Continuity buzzer is frugal with power. Stereo jack adds no-cost power/logic control. S/H circuit minimizes aperture....

Precision T/H Amplifier uses 3.3 Volt Supply - 06/22/95 EDN-Design Ideas: (design idea added 3/03)

RF Transmitter uses AMI encoding - 11/24/99 EDN-Design Ideas: 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 logic ones and no signal to.....(design idea added 8/03)

S/H circuit minimizes aperture - 04/15/99 EDN-Design Ideas: [Note: File contains multiple circuits. 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.....(design idea added 2/06)

Sampling peak detector has shutdown feature - 05/16/02 EDN-Design Ideas: 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.....(design idea added 1/05)

Special Sample & Hold Techniques - National Semiconductor Application Note (app note added 2/06)

Video Design Idea: Diagnose setup & hold times in synchronous & asynchronous circuits - 10/18/07 EDN-Design Ideas: 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.....(design idea added 9/08)