| 摘要 |
A signal shaping circuit (100) shapes an input signal (DATA INPUT) of a digital data stream provided at an input terminal and generates an output signal (OUTPUT) at an output (122) having sinusoidally shaped transition regions between logic level transitions of the digital data stream. The signal shaping circuit (100) comprises the input terminal (102) for receiving digital pulses of the digital data stream, a delay circuit (106) for delaying the digital pulses at the input terminal (102) for a predetermined time delay, and a ringing filter circuit (124) coupled to the input terminal (102) and the delay circuit (106) for generating the output signal (OUTPUT) responsive to the digital data stream. The ringing filter circuit (124) has a ringing period about equal to or less than twice a period of the digital data stream and the predetermined time delay of the delay circuit (106) is about equal to half of a ringing period. The output waveform of the output signal (OUTPUT) has a lower bandwith than the corresponding input signal and no intersymbol interference associated with it.
|
