Analog Devices,inc.

Analog Devices Technology

Finbarr O'Leary

George Redfield Spalding, Jr

Roger Peppiette

Naiqian Ren

Michael Edward Bradley

Nigel David Brooke

George R Spalding

A ping pong comparator voltage monitoring circuit which includes first and second comparators having inputs connected to a voltage Vin to be monitored, and second inputs connected to first and second nodes, respectively. A multiplexer alternately couples the first and second comparator outputs to an output in response to a periodic control signal. A ground-referenced voltage Vrefis provided at a third node and a voltage Vrefreferenced to Vrefis at a fourth node. A hysteresis hystis switchably connected between the third and first nodes, and a hysteresis hystis switchably connected between the fourth and second nodes. Hystand hystare switched in when the mux output toggles due to a rising Vin, and are switched out when the mux output toggles due to a falling Vin.

Ping pong comparator voltage monitoring circuit

A reset circuit comprising: a first depletion mode device having a first terminal coupled to a node at a reset voltage and a second terminal for providing a reset signal to at least one device; and a control circuit arranged to switch the first depletion mode device into a high impedance state after a first predetermined period.

Reset generator

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Finbarr O'Leary