Patent ID: 8116716

Claim:
A mobile wireless communications device comprising: a housing; a plurality of circuit boards carried by the housing, at least one of said circuit boards including an oscillator having an output and configured to generate a clock signal, a microprocessor, a radio frequency (RF) transceiver, RF circuitry and an analog or digital circuit and operative with each other wherein the RF transceiver is more sensitive to the digital noise from the microprocessor than the RF circuitry, which is more sensitive to the digital noise than the analog or digital circuit; and clock buffer circuitry carried by at least one of the circuit boards and comprising serially connected first, second and third buffers wherein said RF transceiver and said first buffer are connected to said oscillator output, and said RF circuitry is connected to the output of the first buffer, the analog or digital circuit is connected to the output of the second buffer, and the microprocessor is connected to the output of the third buffer and said buffers configured to reduce the digital noise at the RF transceiver and followed in order by the RF circuitry and the analog or digital circuit.