Cadence Design Systems, Inc.

Dimitrios Loizos

Xiaobin Yuan

Steven Elliott Mikes

Mehran Mohammadi Izad

Manohar Bhavsar Nagaraju

Varun Joshi

Paul Lee

Sudipta Sarkar

Embodiments included herein are directed towards a fractional feedback divider circuit and associated method. The circuit may include a programmable feedback divider including a plurality of flip-flops arranged in series. The programmable feedback divider may be configured to receive an input clock signal and a reset signal comprising at least one pulse and to generate a divided clock. The circuit may include reset logic configured to receive an input from the programmable feedback divider and to generate a reset signal. The circuit may include a first D flip-flop configured to receive the reset signal and to generate an output and a second D flip-flop configured to receive the output from the first D flip-flop and to generate a second output. The circuit may further include a multiplexer configured to receive the second output and to generate an output clock signal.

Programmable fractional ripple divider

A high-speed multiplexor comprises a set of differential input pairs to receive and mix a set of differential input signals at a differential output node pair. The high-speed multiplexer further comprises an active inductive load pair driven by the input stage using the mixed set of differential input signals. Each active inductive load comprises a p-channel field effect transistor (pFET) device connected to one of the differential output node pairs and a resistor connected between a gate node and a drain node of the pFET device. The multiplexer further comprises a first cross-coupling capacitor connected between the gate node of a first inductive load and a second output node of the differential output node pair and a second cross-coupling capacitor connected between the gate node of a second inductive load and a first output node of the differential output node pair.

High-speed multiplexer

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Sunnyvale, CA, United States of America

Dimitrios Loizos