Patent ID: 8610589

Claim:
A frequency/timing measurement apparatus comprising: a reference source having a reference source output terminal; at least one target source having a target source output terminal, said at least one target source communicatively coupled to said reference source; said reference source comprising a reference source RC circuit and said at least one target source comprises at least one target source RC circuit and said reference source RC circuit and said at least one target source RC tank are configured to share a common relaxation oscillator amplifier in a selected one of a time multiplexed manner and a simultaneous manner; and a frequency timing measurement block having a first input terminal electrically coupled to said reference source output terminal, a second input terminal electrically coupled to said target source output terminal, and at least one output terminal, said frequency timing measurement block configured to perform a noise shaping technique to reduce measurement error attributable to a phase noise that is correlated between said reference source and said target source, and to provide a reduced correlated noise measurement at said at least one output terminal.