Apple inc. (20250062769). Low Noise, Supply Rejecting Linear Phase Interpolator
Low Noise, Supply Rejecting Linear Phase Interpolator
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Low Noise, Supply Rejecting Linear Phase Interpolator
This abstract first appeared for US patent application 20250062769 titled 'Low Noise, Supply Rejecting Linear Phase Interpolator
Original Abstract Submitted
a phase interpolator circuit includes a capacitance circuit, a switched resistor network, and interpolation management circuitry. the resistor network receives a start-phase signal and an end-phase signal, and generates an interpolated output signal from a voltage on the capacitance circuit. the interpolation management circuitry receives an interpolation code defining an intermediate phase between the start-phase signal and the end-phase signal, charges or discharges the capacitance circuit through the resistor network, and controls the resistor network to set a phase of the interpolated output signal to be the intermediate phase. the interpolation management circuitry also (i) responsively to a transition in the start-phase signal, sets the resistance of the resistor network based on the interpolation code, and (ii) responsively to a voltage level on the capacitance circuit, sets the resistance of the resistor network to a constant resistance, and flows through the capacitance circuit an additional boosting current.