Global Patent Index - EP 1099299 A1

EP 1099299 A1 2001-05-16 - A MODULATOR

Title (en)

A MODULATOR

Title (de)

EIN MODULATOR

Title (fr)

MODULATEUR

Publication

EP 1099299 A1 (EN)

Application

EP 99934908 A

Priority

  • GB 9902355 W
  • GB 9815888 A

Abstract (en)

[origin: WO0005807A1] A modulator for modulating a carrier signal with a modulating signal, the modulator having an input stage (51) for receiving a directly coupled balanced modulating signal (MS) and for providing a grounding path for the carrier signal (CS), a switching network (52) for switchably supplying, in accordance with a switching cycle controlled by the carrier signal (CS), the modulating signal in either forward or reverse sense to an output stage (53), a further input stage (14, 29, 30) for providing an input for the carrier signal (CS), and an output stage (53) for converting the balanced modulated signal into an unbalanced output signal. The balanced modulating signal (MS) is directly coupled by means of a conductive or resistive coupling (21, 22) in the input stage. The switching network (52) comprises two pairs of signal paths which are switched "on" and "off" in anti-phase with one another in accordance with the switching cycle. The further input stage (14, 29, 30) couples the carrier signal (CS) to the switching network such that the carrier signal operates in a common mode on the two pairs of signal paths. The carrier signal is an unbalanced signal which is coupled to output terminals via parallel resistive couplings (R3). The output stage comprises a balun (55).

IPC 1-7 (main, further and additional classification)

H03C 1/58

IPC 8 full level (invention and additional information)

H03C 1/58 (2006.01)

CPC (invention and additional information)

H03C 1/58 (2013.01)

Citation (search report)

See references of WO 0005807A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

GB 2339983 A 20000209; GB 2339983 B 20020220; GB 9815888 D0 19980916; EP 1099299 A1 20010516; WO 0005807 A1 20000203

INPADOC legal status


2002-05-15 [18W] WITHDRAWN

- Date of withdrawal: 20020315

2001-05-16 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010209

2001-05-16 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE