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Preposed amplifier and method for correcting offset voltage of same

A technology of preamplifier and offset voltage, which is applied to improve amplifiers to reduce temperature/power supply voltage changes, differential amplifiers, DC-coupled DC amplifiers, etc., and can solve problems such as reduced deviation tolerance and differential signal duty cycle distortion.

Inactive Publication Date: 2009-12-23
HIMAX MEDIA SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the differential signal amplified by the output of the preamplifier may have the problem of duty cycle distortion, and the skew tolerance of the receiver using this preamplifier may also be reduced.

Method used

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  • Preposed amplifier and method for correcting offset voltage of same
  • Preposed amplifier and method for correcting offset voltage of same
  • Preposed amplifier and method for correcting offset voltage of same

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Embodiment Construction

[0017] figure 1 A schematic diagram of a preamplifier according to an embodiment of the present invention is shown. The preamplifier 100 includes several stages (eg, N stages) of amplifying circuits 102 connected in series, wherein each amplifying circuit 102 may be a current mode logic (CML) circuit. The small differential signals VIP and VIN are input to the amplifier circuit 102 of the first stage, and are sequentially amplified by the series-connected amplifier circuit 102 . Next, the amplified differential signals VOP and VON are output by the Nth stage amplifying circuit 102 .

[0018] figure 2 According to the embodiment of the present invention, a figure 1 Schematic diagram of the main circuits in the amplifier circuit shown. It is worth noting here that in figure 1 Among the amplifying circuits 102 shown, at least one of them may include figure 2 circuit shown. In one embodiment, as figure 2 The circuit shown is included in stage 1 amplifier circuit 102 to ...

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Abstract

The invention relates to a preposed amplifier and a method for correcting the offset voltage of the same, wherein the preposed amplifier comprises a plurality of amplifying circuits connected in series, and at least one of the amplifying circuits connected in series comprises a differential opposite-switch circuit, a comparer and a plurality of energy storage units, wherein the differential opposite-switch circuit is provided with differential input ends and differential output ends; the comparer is used for comparing potentials of the differential output ends to output comparison signals; and the energy storage units are singly and selectively coupled with one of the differential output ends according to the comparison signals to regulate the potentials of the differential output ends. Besides, the invention also discloses the method for correcting the offset voltage of the preposed amplifier.

Description

technical field [0001] The present invention relates to an amplifier circuit in a receiver, and in particular to a preamplifier in a receiver and a method for calibrating offset voltage therein. Background technique [0002] For a preamplifier in a general receiver, it is usually composed of several stages of series-connected amplifying circuits, so as to sequentially amplify the input signal. Specifically, the small-signal differential signal is usually first input into the preamplifier, and then sequentially amplified by the series-connected amplifying circuit, and then becomes the large-signal differential signal for use by subsequent circuits. [0003] However, in the preamplifier, each stage of the amplifying circuit has more or less offset voltage therein, so that the differential signals output and amplified by the amplifying circuit have different common voltage levels. As a result, the differential signal amplified by the output of the preamplifier may have the pro...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F1/30
Inventor 黄志豪
Owner HIMAX MEDIA SOLUTIONS