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...
Amplifier compensates piezoelectric-rate gyros
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...
A "free" ADC
Despite the increasing availability and declining cost of on-chip analog peripherals, the humble PWM DAC retains its appeal as a “free” DAC that can repurpose an uncommitted DIO pin and counter/timer module...
Pass transistor lowers dropout voltage
With linear regulators, you measure dropout voltage, VIN – VOUT, at the minimum input voltage for which the IC sustains regulation. Low dropout means longer battery life, because the load circuit continues to operate while the battery discharges to a lower terminal voltage...