Importance

Loading Importance Indicators...

Abstract

A clock generator has a duty cycle correction circuit that adjusts the duty cycle to 50%. A modulator is an inverter with extra source-limiting transistors in series to the power and ground supplies. A control voltage of about Vcc/2 is applied to the source-limiting transistors, causing them to operate in the linear region with limited current. A slow-slew output from the modulator is buffered by a driver. The driver output is filtered by a linear detector with a series resistor and input capacitor. The detector output is compared to a reference voltage of Vcc/2 by an error amp. The error amp generates the control voltage fed back to the modulator. An output capacitor creates a dominant pole with the error amp to ensure stability. A variable-threshold gate can be added between the driver output and the detector to separately adjust the measurement threshold voltage from the reference voltage to the error amp.

Loading the Abstract Image...

First Claim