Method and apparatus for providing biphase modulation

Details Method and apparatus for providing biphase modulation Method and apparatus for providing biphase modulation

1994-10-11

1997-10-21

Chin, Stephen

Pulse or digital communications

Cable systems and components

375282, 375283, 375308, 332103, 332146, 333164, H04B 300, H04L 2500

Patent

active

056804172

ABSTRACT:
A binary phase shift keyed (BPSK) modulator (200) used for digital phase modulation is shown. Phase shift is achieved by electrically switching an RF input signal (201) through either a direct signal path (203) or through a half wave transmission signal path (205) to shift its phase by 180 degrees. Both the data signal (211) and its complement (213) are used to turn on one of PIN diodes (207, 209) while simultaneously turning off the other diode with reverse bias. This technique allows for obtaining maximum diode isolation. The BPSK modulator (200) has the advantages of very low insertion loss, dc coupling for low frequency modulation components and high performance with minimum parts.

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