Patent ID: 7800452
Filing Date: 2010-09-21
Classification: H03C,H03L

Abstract:
1. A transceiver integrated circuit on which a transmitter circuit, a receiver circuit, and a local oscillating signal synthesizer of said receiver circuit are monolithically integrated, said transmitter circuit having a sigma delta modulator and a phase locked loop circuit comprising: a first voltage controlled oscillator; a first frequency transform circuit to which the output of said first voltage controlled oscillator is connected; a first phase detector to a first input of which the output of said first frequency transform circuit is connected, and to a second input of which a first reference signal is connected; a first charge pump circuit to which the output of said first phase detector is connected; a first loop filter to which the output of said first charge pump circuit is connected, wherein the output of said first loop filter is connected to a frequency control terminal of said first voltage controlled oscillator; a first counter circuit to which the output of said first voltage controlled oscillator is input; a first accumulator circuit to which the output of said first counter circuit is inputted; and a first loop characteristics detection circuit that detects the loop characteristics of the phase locked loop circuit based on the result obtained by integrating the output of said first counter circuit through said first accumulator circuit, wherein said local oscillating signal synthesizer comprises a programmable counter that provides a division number to generate a local oscillating signal of said receiver circuit, and wherein said programmable counter is controllable in count value by a control signal generated based on an output of said sigma delta modulator.