Active solid-state devices (e.g. – transistors – solid-state diode – Integrated circuit structure with electrically isolated... – Passive components in ics
Reexamination Certificate
2001-04-05
2003-09-16
Le, Vu A. (Department: 2824)
Active solid-state devices (e.g., transistors, solid-state diode
Integrated circuit structure with electrically isolated...
Passive components in ics
C257S294000, C257S499000, C257S528000, C257S536000
Reexamination Certificate
active
06621144
ABSTRACT:
This invention relates to gain enhancement, particularly to enhancement of a data receiver circuit for high speed data reception.
BACKGROUND OF THE INVENTION
Amplification is used to amplify incoming signals of variable (small) amplitude to rail-to-rail logic signals. However, variation in signal se can occur, as by losses in the signal path. As a result, the amplified signal can vary in strength.
SUMMARY OF THE PRESENT INVENTION
As stated above, due to various reasons, the input signal can vary in strength, and so the amplified signal varies in strength. In many applications, typical input signals at 400 Mbits/S (2.5 ns bit cell time) have an amplitude of 200 mV, with occasional smaller pulses of <110.mV. Ideally the receiver would always produce full swing output signals with a constant delay, independent of input signal amplitude. By placing a passive filter between the V/I converter and the inverting amplifier stage, it is possible to amplify certain frequencies within the signal more than others, depending on the characteristics of the filter. This enables compensation for losses earlier in the signal path. Thus a device for enhancement of data receiver gain comprises of V/I converter, an amplifier and a passive filter placed between the amplifier and the V/I converter.
REFERENCES:
Sedra/Smith, Microelectronic Circuits, third edition, 1991, pp. 38 and 779.
Koninklijke Philips Electronics , N.V.
Le Vu A.
Menz Douglas
Zawilski Peter
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