Title:
FRONT-END SENSITIVITY BOOSTER
Document Type and Number:
WIPO Patent Application WO2004093313
Kind Code:
A3
Abstract:
The invention relates to a method for increasing the sensitivity of a chain of amplifiers that comprises the steps of amplifying a signal by means of a first amplifier with a gain factor A1=A1,m* Delta A1, where A1,m denotes a constant gain factor and A1 denotes a gain factor variation with 1 <= DELTA A1,min <= DELTA A1 <= DELTAA1,max, further amplifying the signal by means of a second amplifier with a controllable gain factor A2 <= A2,max, where variations Delta A1 of the gain of the first amplifier are compensated by reducing the gain A2 of the second amplifier, so that the difference between the chain gain factor AC = A1*A2 and a target chain gain factor AT <= AT,max becomes zero. To solve the object of the invention to provide a method for increasing the sensitivity of a chain of amplifiers that suffers from gain factor variations, it is proposed that that the signal at the output of the second amplifier is additionally fed into a divider that applies a fixed factor A3 <= 1 to its input, that variations Delta A1 of the gain factor A1 of the first amplifier as well as the fixed factor A3 are at least partially compensated by the gain factor A2 of the second amplifier, so that the difference between the chain gain factor AC'= A1*A2*A3 and the target chain gain factor AT becomes minimum, and that the fixed factor A3 is chosen so that there exist at least some combinations of values Delta A1 and AT for which said difference can be forced to zero, and some combinations of values Delta A1 and AT, for which said difference can no longer be forced to zero due to the limitation A2 <= A2,max. The invention further relates to a device for increasing the sensitivity of a chain of amplifiers.
Inventors:
LAMBRECHT XAVIER JEAN FRANCOIS (DE)
Application Number:
PCT/IB2004/001073
Publication Date:
December 16, 2004
Filing Date:
March 22, 2004
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
LAMBRECHT XAVIER JEAN FRANCOIS (DE)
LAMBRECHT XAVIER JEAN FRANCOIS (DE)
International Classes:
H03G3/30; (IPC1-7): H03G3/30
Foreign References:
| EP0838896A2 | 1998-04-29 | |||
| EP0797299A2 | 1997-09-24 | |||
| US5940143A | 1999-08-17 | |||
| US6148189A | 2000-11-14 | |||
| US4434405A | 1984-02-28 | |||
| GB2334162A | 1999-08-11 |
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