Patent ID: 8086188

Claim:
A transceiver comprising: a receiver including a receiver-side demodulator for converting a received RF receive signal into an analog receive signal; and a transmitter including a transmitter-side modulator for converting an analog transmit signal into an RF transmit signal, wherein the transmitter further includes a digital-to-analog converter for converting a digital transmit signal into the analog transmit signal; a transmitter-side voltage-controlled oscillator; and a transmitter-side divider for frequency-dividing a transmitter-side oscillating output signal produced by the transmitter-side voltage-controlled oscillator thereby to produce first and second transmitter-side local signals to be supplied to the transmitter-side modulator, wherein a dividing factor of the transmitter-side divider is set to a non-integral number larger than one, wherein the transmitter-side divider having the dividing factor set to the non-integral number is composed of a logic divider which performs a logic operation thereby to produce the first and second transmitter-side local signals differing in phase, wherein the first and second transmitter-side local signals produced by the transmitter-side divider are a pair of non-quadrature local signals having a phase difference of 90° plus a predetermined local offset angle, wherein the digital transmit signal comprises a pair of quadrature transmit signals having a phase difference of about 90° on an analog basis, wherein the transmitter further includes a phase-shift unit for converting the pair of quadrature transmit signals into a pair of non-quadrature shifted transmit signals having a phase difference of 90° plus a predetermined transmit signal offset angle on an analog basis, wherein mixing of the pair of non-quadrature shifted transmit signals from the phase-shift unit, and the pair of non-quadrature local signals from the transmitter-side divider is performed in the transmitter-side modulator of the transmitter, and wherein the RF transmit signal is formed by outputs of the transmitter-side modulator of the transmitter according to quadrature modulation as a result of the mixing.