High school trigonometry combined with four-quadrant multipliers can be exploited to yield sinusoidal frequency doublers. Nothing non-linear is involved, which means no possibly strident filtering requirements...
Articles and news - 2
Analog frequency doublers
Drive any electronic clock with a high-precision 10-MHz reference
Most electronic clocks, be they analog or digital, use a crystal oscillator based on a 32.768 kHz crystal for their reference. In fact, it is same crystal that’s commonly used as a real-time clock for many microcontroller systems...
Improve PWM controller-induced ripple in voltage regulators
Simple linear and switching voltage regulators with feedback networks of the type shown in Figure are legion. Their output voltages are the reference voltage at the feedback (FB) pin multiplied by...
Hybrid relay basics: Why engineers are switching smarter
Hybrid relays are changing the way we think about switching inside electronic circuits. By combining the fast response of solid-state components with the reliability of mechanical contacts, these devices offer the best of both worlds...
Circuit controls ratiometric or simultaneous power-up of multiple rails
Many applications use FPGAs, ASICs, or DSP chips, which usually require multiple voltage rails, typically two: the core voltage and the I/O voltage...
Power bank "Keep-alive"
A simple module to keep power banks from turning off, when your DIY circuit draws low currents...
Increasing bit resolution with oversampling
Many electronic designs contain an ADC, or more than one, to read various signals and voltages. Often, these ADCs are included as part of the microcontroller (MCU) being used...
Unusual 2N3904 transistor circuit
A Planet Analog article, “2N3904: Why use a 60-year-old transistor?” by Bill Schweber, inspired some interest in this old transistor and how it’s commonly used, and if any uncommon uses might exist...
Qorvo introduces TDD beamformer IC for compact, power-efficient Ku-band SATCOM terminals
Qorvo announced the release of a Ku-band beamformer IC designed to meet the growing demand for terminals that support time-division duplexing in compact and power-sensitive SATCOM applications...
PWM buck regulator interface generalized design equations
A while back, I published the Design Idea “Simple PWM interface can program regulators for VOUT < VSENSE”. It showed some simple circuits for PWM programming of standard bucking-type regulator chips...