Patent ID: 6727768
Filing Date: 2004-04-27
Classification: H03K

Abstract:
A relaxation current controlled oscillator, comprising:an integrator having a first and a second input and at least one output, said integrator integrating a voltage signal applied at its inputs, said integrator further comprising a transconductance amplifier having a first and a second input and at least one output, said transconductance amplifier having a transconductance gm, said transconductance amplifier providing at its output a signal proportional to its inputs, said inputs of said transconductance amplifier coupled to said inputs of said integrator, said output of said transconductance amplifier coupled to said output of said integrator; and capacitive means coupled to the output of said transconductance amplifier, where said capacitive means is charged up by the output signal of said transconductance amplifier; first comparator means for comparing the output signal of said transconductance amplifier against a first reference voltage, said first comparator means setting a Set-Reset type flip-flop when said output signal of said transconductance amplifier matches said first reference voltage; second comparator means for comparing the output signal of said transconductance amplifier against a second reference voltage, said second comparator means resetting a Set-Reset type flip-flop when said output signal of said transconductance amplifier matches said second reference voltage; and first and second switching means in communication with said inputs of said transconductance amplifier for controlling the polarity of said voltage signal applied to said inputs of said transconductance amplifier.