App note: Miniature, precision negative reference requires no precision resistors

App note from Maxim Integrated creating voltage negative reference from charge-pump inverter plus positive voltage reference combo. Link here (PDF) This application note discusses how to build a negative voltage reference without using external resistors or a negative supply by simply combining a simple charge-pump inverter and a positive output voltage reference.

App note: Nonvolatile STANDBY/ON Switch

Power status recovery in this application note from Maxim Integrated. Link here (PDF) Using an electronically programmable voltage reference (DS4305) as a single-bit nonvolatile memory cell, this circuit remembers the state of a STANDBY/ON switch that changes state with no operator present.

App note: Voltage reference long-term stability reduces industrial process control calibration costs

Application note from Maxim Integrated about improved long term stability of their voltage references. Link here (PDF) Large industrial plants such as those in the oil, gas, electricity, pharmaceutical, and food and beverage industries rely on electronic instrumentation to provide accurate, stable measurements to control their processes. The stability of an instrument very much depends […]

App note: Voltage reference calibration and voltage ADC usage

An app note from Atmel,  voltage reference calibration and voltage ADC usage (PDF!): Features • Voltage reference calibration. – 1.100V +/-1mV (typical) and < 90ppm/°C drift from –10°C to +70°C. • Interrupt controlled voltage ADC sampling. • Calculation of voltage and temperature from voltage ADC measurements. Some of the new Atmel AVR Smart Battery devices contain […]

A look inside a ’70s voltage and current standard

SQKYBeaver did a teardown of a Techtron Standards type 51 voltage and current standard: Absolutely amazing inside! The wires to the front panel look like the were loomed by a professional Spacecraft mechanic. every one individually numbered it must have taken hours. only 4 rc4136 quad opamps for all this functionality, two dating back to 1973.