Patent ID: 8958515
Filing Date: 2015-02-17
Classification: G01R,G06G,H04B,H04L

Abstract:
1. A system for controllably generating jitter in a serial data stream, comprising: a frequency generator configured to output in-phase and quadrature local oscillator signals with a local oscillator frequency of at least 5 MHz that varies between a selectable minimum frequency and a selectable maximum frequency; a first mixer configured to mix a fixed frequency clock signal with said in-phase local oscillator signal to output a first mixer output; a second mixer configured to mix said fixed frequency clock signal with said quadrature local oscillator signal to output a second mixer output; and an adder configured to add said first and second mixer outputs to produce a frequency- modulated clock signal with a frequency that is about the sum of the fixed frequency and the local oscillator frequency and includes a periodic jitter that corresponds to said selectable minimum frequency and said selectable maximum frequency.