Title:
A WIRELESS DIGITAL COMMUNICATION DEVICE, AND A PULSE SHAPING NETWORK
Document Type and Number:
WIPO Patent Application WO1997004525
Kind Code:
A3
Abstract:
A wireless digital communication device having a pulse shaping network for pulse shaping digital signals before modulation. The pulse shaping network comprises a shift register to which data to be modulated are fed. Outputs of the shift register are connected to control inputs of switched weighted current sources. The switched weighted current sources are summed over an output resistor. An adjustment voltage for adjusting the magnitude of the shaped data is fed to one input of a differential amplifier, a reference resistor being coupled to another input of the amplifier, and to a reference current source which is mirrored into the switched weighted current sources. Thus, an accurate and easily adjustable pulse shaping network is obtained.
Inventors:
JANSSEN DANIEL JOHANNES GERARD
Application Number:
PCT/IB1996/000675
Publication Date:
March 20, 1997
Filing Date:
July 11, 1996
Export Citation:
Assignee:
PHILIPS ELECTRONICS NV (NL)
PHILIPS NORDEN AB (NL)
PHILIPS NORDEN AB (NL)
International Classes:
H03H15/00; H03H17/02; H03K4/02; H03K4/94; H03K5/02; H03M1/74; H04L27/12; H04L27/20; (IPC1-7): H03K5/02; H04L27/12; H04L27/20
Domestic Patent References:
| WO1994027392A1 | 1994-11-24 |
Foreign References:
| EP0107980A2 | 1984-05-09 | |||
| EP0538870A2 | 1993-04-28 | |||
| EP0542633A1 | 1993-05-19 | |||
| US4276573A | 1981-06-30 | |||
| US4974916A | 1990-12-04 |
Other References:
See also references of EP 0783797A1
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