Back to Analog
345 results found, displaying items 321 - 340
Create a quiet −5 V supply for 14-bit ADCs
Many high-performance data-acquisition systems reap multiple benefits when using ±5-V supplies rather than a single 5-V supply. These benefits include the ability to handle larger signal magnitudes than is possible with a single 5-V supply. This...
Circuit allows accurate sync of multiple CCTV signals
There are times when CCTV sync signals must maintain temporal fidelity when derived from composite video. One such case involves applications in which several video sources are polled by an instrument which then extracts photometric data from video...
Single-supply op-amp input bias-current cancellation
Op-amp performance has advanced dramatically during recent years, but the relative advantages between bipolar input amplifiers and FET types remain the same. FET input parts are still characterized by superior bias current specifications, while...
Battery-current monitor operates "over the top"
The bidirectional current sensor shown takes advantage of the extended common-mode range (greater than 90 dB) of the LT1495 dual op amp, to sense currents in and out of a 12-V battery while operating from a single 5-V supply (...
Pi filter has notch just outside passband
Some applications such as antialiasing could benefit from a lowpass filter with a notch just outside the passband. The filter in Fig. 1 is a Cauer or Elliptic type, but with a source impedance of zero....
Instrumentation amp turns into 600-MHz gain-bandwidth op amp
An interesting but brief mention is made in Analog Devices’ AN-245 application note (by Scott Wurcer and Walt Jung) that instrumentation amplifiers can be configured as op amps with very high gainbandwidth (GBW) products. In applications that use...
Simple gain stage swings gain positive or negative
This idea is a simplification of a previously published design idea (see “Single Pot Swings Amplifier Gain Positive Or Negative,” Electronic Design, Jan. 20, p. 153). By using another previous design idea (see “One Transistor...
High-voltage adjustable shunt regulator
Occasionally, the need arises for a variable shunt regulator capable of high-voltage operation. At high voltages, multiple transistors in series overcome safe-operating area (SOA) limitations much more effectively than parallel configurations....
Swept sine oscillator has quadrature output
Signals with a know frequency but unknown phase may be detected using an in-phase and a 90° shifted reference signal, as frequently used in lock-in amplifiers, synchronous detectors, and frequency-response analyzers. The 90°-shifted signal...
Full-wave signal rectifier uses just one transistor
The simple circuit shown accomplishes full-wave signal rectification with only one transistor (Fig. 1). This is done by exploiting the “gain reversal” phenomenon exhibited by a saturated bipolar transistor....
Optically isolated input, single-supply true-RMS converter
With high-performance monolithic rms converters available, why would anyone design one? Simple: No commercially available IC, running from a single power rail, can accurately convert signals with a dc component. Nor can any IC accommodate signals that...
Supply circuitry selects main or backup voltage and disconnects load
A complete portable-equipment power supply, suitable for systems that can be plugged into a docking station, is presented in this circuit idea. When the main supply is removed or falls out of regulation, selector circuitry automatically switches the...
Simple soft-start circuit for switching regulators
In the early stages of development, one of the many issues circuit designers must evaluate is how the circuit behaves when power is first applied. Unexpected things can happen at startup. All capacitors must be charged and all ICs change from an...
DAC-powered charge pump varies negative rail
The circuit shown provides a low-current, adjustable negative supply rail suitable for use as a sensor bias, LCD-contrast bias, or a VCO tuning supply. By operating a charge-pump doubler from the output of a buffered DAC, it avoids the customary...
Simple switchers make simple pre-regulators
Linear regulators are used extensively because of their simplicity, low cost, quiet operation, and clean outputs. In applications where the output voltage must be adjusted over a wide range, however, they can dissipate considerable power and require...
Generate a 9.997925-MHz signal using a 10-MHz reference
Numerous applications require the synthesis of a slightly offset frequency with respect to a given reference. The idea presented here uses a circuit to generate a 9.997925-MHz signal utilizing a 10-MHz reference. The frequency offset is low (only 2...
Are MOSFETs truly self-protecting?
Often, some concern is felt regarding the survival of MOSFETs during handling and soldering. Whereas this fear is well-grounded for small-signal devices, most power MOSFETs are observed as being inherently quite robust. This is despite the fact that...
Use a FET as a linear temperature sensor
In many linear applications of field-effect transistors, the FET is used as a constant-current device for large VDS (i.e., drain-to-source voltage) or as ohmic resistance for small VDS. In the region before pinch-off, the FET is...
Zero-voltage switching converter
The “TWitt” converter shown features a forward converter transfer function and can operate effectively at high switching frequencies because it achieves zero voltage switching (ZVS) of all of its switches for all transitions (...
Low-cost, isolated 5-V supply for 3.3-V logic
Occasionally, a 3.3-V logic system will need an isolated supply for a peripheral function. There are some dc-dc converters available. However, if spare inverters are present in the circuit, a low-cost solution can be produced using only four inverters...
 prev. page
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
[17]
18
next page 
|
