| 摘要 |
<p>A dual-mode radiotelephone terminal includes a pi /4-shift DQPSK modulator (11). A dual-mode modulation is achieved by mixing an output of a transmitter oscillator (16) with an output of an offset oscillator (18) to form an injection signal (LO) at a final transmitter frequency, the injection signal being further modulated with a quadrature modulator in a digital mode of operation. In the analog mode of operation the transmitter oscillator or offset oscillator is frequency modulated and the quadrature modulator is disabled, thereby passing the frequency modulated injection signal without substantial attenuation. The LO signal is regenerated and also phase shifted with a circuit (35) having a frequency multiplier (30) and a frequency divider (34). The circuit outputs two local oscillator (LO) signals (LOA and LOB), each of which directly drives an associated quadrature mixer (36, 38) of the modulator. In a further embodiment of the invention the dual-mode radiotelephone terminal includes a VHF synthesizer (23), a UHF synthesizer (21), and a local oscillator (4C) that provides a signal only when operating in the analog receiving mode. The local oscillator signal is mixed with a first IF signal for providing a second IF signal when operating in the analog receiving mode or in a standby mode. The first IF frequency is provided by a standard IF filter (45 MHz) when operating in either the digital or the analog mode of operation. The output of the VHF synthesizer is divided (22) and used as an input to a mixer (4F) that provides a second IF signal when operating in the digital receiving mode. A control signal is employed for selectively enabling and disabling various of these components as a function of the operating mode, thereby conserving power. <IMAGE></p> |
