Sampling Circuits

Sampling Circuits
Last Updated on: Wednesday, June 02, 2021 01:44 PM

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.

Air Transparency Monitor, pg 2 - This is of the air transparency monitor receiver circuit.

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

Air Transparency Monitor, pg 1 - 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, pg 2 - This is of the air transparency monitor receiver circuit. [Designed by David A. Johnson]

AN-270: Applying IC Sample & Hold Amplifiers - AN-270 Analog Devices Application Notes....[App Note]

AN-284: Implement Infinite Sample-and-Hold Circuits using Analog Input/Output Ports - AN-284 Analog Devices Application Notes....[App Note]

Calibrate scope jitter using a transmission line loop - 20-Sep-01 Issue of EDN 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 jitter from the measured jitter. However, oscilloscopes rarely have a jitter specification, so you must determine the oscilloscope jitter. [Design Idea by David Cuthbert, Micron Technology, Boise, ID]

Circuit improves on temperature measurement - 2-May-02 Issue of EDN 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 relationship (references 1 to 4] and has numerou. [Design Idea by Alexander Bell, Infosoft International Inc, Rego Park, NY]

Circuit lets you test sample-and-hold Amplifiers - 4-Mar-10 Issue of EDN Measure voltage drop with a digital voltmeter. [Design Idea by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

Dual-input sample-and-hold Amplifier uses no external resistors - 14-Dec-07 Issue of EDN A sample-and-hold Amplifier sums two inputs and holds that sum when triggered. [Design Idea by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

Gain-of-two instrumentation Amplifier uses no external resistors - 8-Nov-07 Issue of EDN 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 by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

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 by William R Penrose and Li Pan, Transducer Research, Naperville, IL]

Inverting sample-and-hold Amplifier requires no external resistors - 2-Aug-07 Issue of EDN Eliminating external feedback resistors in an inverting sample-and-hold Amplifier allows it to exploit the full bandwidth of its op Amps. [Design Idea by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

NCO technique helps µC produce clean analog signals - 04/15/99 Issue of EDN 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. Page includes several designs. Scroll to find this one....(EDN Design Ideas] [Design Idea by Steve Ploss, Veridian Corp, Wright Patterson AFB, OH]

S/H circuit minimizes aperture - 04/15/99 Issue of EDN 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. Page includes several designs. Scroll to find this one. [Design Idea by John Guy, Maxim Integrated Products, Sunnyvale, CA]

Sampling peak detector has shutdown feature - 16-May-02 Issue of EDN 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 Amplifier from Maxim (www.maxim-ic.com]. This Amplifier has a shutdown feature that facilitates power savings without losing the sampled information. [Design Idea by Shyam Tiwari, Sensors Technology Private Ltd, Gwalior, India]

Video Design Idea: Diagnose setup and hold times in synchronous and asynchronous circuits- 18-Oct-07 Issue of EDN 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 by Staff]

Sampling Circuits