Energy meters, heating/ventilation/air-conditioning systems, and high-power equipments that run on three-phase ac inputs pose a challenge to power-supply designers because nominal input voltage can be as high as 540 V ac...
Operate circuits at voltages as high as 540V ac
Circuit precludes common-mode conduction
When driving an H-bridge or a similar circuit, you usually must ensure that two or more transistors are not on at the same time. Eliminating multiple transistors from turning on reduces power consumption and lowers EMI...
Amplifier compensates piezoelectric-rate gyros
Low-power, low-cost ceramic piezoelectric rate gyros are available, but they lack the low-temperature-coefficient characteristics of their quartz counterparts. However, you can use a servo amplifier to remove the dc level shift...
Dual-input sample-and-hold amplifier uses no external resistors
At least two classic ways exist to address applications requiring sampling of a sum of analog voltages. The most common way is to cascade a classic analog adder and a sample-and-hold amplifier...
Sensing negative outputs
Various switching regulator circuits exist to provide positive- to-negative conversion. Unfortunately, most controllers cannot sense the negative output directly; they require a positive feedback signal derived from the negative output...
Use a low-cost PWM ramp generator in switch-mode power supplies
The circuits shows a PWM ramp generator that you can use in low-cost switch-mode dc/dc power supplies. Its supply voltage can range from 5 to 35 V dc, and you can set the output-ramp amplitude of 0.3 to 1 V....
Ultra-low distortion sinewave oscillator. Part 2
The sample and hold circuit is considerably more complex than the oscillator...
Designing a wideband analog voltage and current meter. Part 2
The switching is arranged so that there are no unused resistors attached to the signal circuit; they are attached to the ground. The switching for the 3/10/13 dB attenuators and ‘External filter’ are covered in the next section...
Designing a wideband analog voltage and current meter. Part 1
Design a wideband analog multimeter to measure AC voltages and currents from 20 Hz to 1 MHz with a selectable sensitivity from 1 mV to 100 V, while the ammeter has a selectable current sensitivity of 10 mA to 10 A...
Zero-bias detector yields high sensitivity with nanopower consumption
RFID tags, circuits that detect a “wake-up” call and return a burst of data, must operate on very low quiescent current for months or years, yet have enough battery power in reserve to answer an incoming call...