Patent ID: 6922089

Claim:
A frequency synthesizing circuit, the circuit being digital, comprising: a multiplexor having at least a first input, a second input, an output, and a control terminal; a controller having at least an input and an output, wherein the output coupling to the control terminal of the multiplexor provides at least one-bit signal to select either data feeding the first input or data feeding the second input of the multiplexor to pass the multiplexor; a first memory device coupling to the first input of the multiplexor for storing a first reference frequency sampled from sinusoidal waves; a second memory device coupling to the second input of the multiplexor for storing a second reference frequency sampled from sinusoidal waves; a linear feedback shift register coupling to the input of the controller, wherein the linear feedback shift register stores a target frequency so as to compare with a predetermined threshold in sequence; and a digital clock signal for clocking a sequential operation of the frequency synthesizing circuit.