Patent ID: 8779831

Claim:
An integrator comprising: a loop operable to oscillate at an oscillation frequency, the loop comprising: a first branch, the first branch comprising a first node, a second node, and a capacitive element series coupled between the nodes of the first branch to cause the loon oscillation at said oscillation frequency; a second branch comprising a first node and a second node connected to said node of the first branch and to an output of the loop for delivering said oscillation signal, the second branch further comprising series coupled between the nodes of the second branch: an amplifier stage for amplification; a filter stage for filtering; and a phase shifter for providing a phase shift; and a summing stage, comprising a first input for summing an input signal into the loop, the input signal having a bandwidth lower than the oscillation frequency; a second input electrically coupled to the first node of the first branch; and an output electrically coupled to the first node of the second branch; and wherein the oscillation signal is dependent upon an integral of the input signal.