| 摘要 |
An apparatus for testing a cellular phone comprising an RF signal generator ( 122 ) for transmitting an RF signal (RF 10 ) to said cellular phone, said RF signal generator receiving an input digital signal (DSIG 10 ) which determines the characteristics of the RF signal, means ( 112, 116 ) for providing said input digital signal comprising means for receiving a digital signal (DSIG 4 , DSIG 5 ), and at least one set of digital means, each set (A, B, C) of digital means comprising: a first digital means ( 200, 201, 202 ) to provide a first digital signal element relating to a first characteristic of said RF signal, and a second digital means (MA, MB, MC) to provide a second digital signal element relating to a second characteristic of said RF signal, and a means ( 203 ) to combine said digital signal elements to provide said input signal to said RF signal generator, said first, second and third characteristics comprise phase, amplitude and delay respectively. Thus the signal processing is carried out in the digital phase which is more easily controlled.
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