Phase locked loop filter circuitry

Abstract

Embodiments of the present disclosure are directed towards circuits that may be used with various phase locked loop circuits. Circuits may include a phase and frequency detector circuit and a charge pump circuit operatively connected to the phase and frequency detector circuit. Circuits may further include a loop filter circuit operatively connected to the charge pump circuit, the loop filter circuit having a first transistor and a second transistor electrically connected with each other, a precharge switch and a capacitor operatively connecting the first and second transistor with a third transistor, and a node located between the third transistor and the capacitor, wherein the node corresponds to a pole in a common gate stage of a feedback path. Circuits may also include a voltage-controlled oscillator circuit configured to receive an input from the loop filter circuit and a divider circuit configured to receive an output from the voltage-controlled oscillator circuit.